Table of Content

10 February 2007, Volume 28 Issue 01

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Analysis and Forecast of Agricultural Drought Event in Midsummer

PANG Zhuan-tang, WANG Zheng-wang(Meteorological Bureau of Changzhi City, Changzhi 046000, China)

2007, 28(01):  13-16. 

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Accorded to the crop growth rules, we formulated the standard of the drought event with agricultural department together and analyzed the drought distribution from the aspect of meteorology. It was concluded that there were three kinds of important weather types led to the drought event, e.g. latitude circulation, continent high pressure control and subtropical high west enter control type. Based on the analysis of the relation of drought event occurrences from 1964 to 2003 with the monthly average temperature of sea surface in the Northwest Pacific Region, the annual mean vortex intensity in the Northern Hemisphere and the temperature change in winter, the forecast equation of the drought event was established by using the optimized subset regression method. The forecast results were walidated for 2004 and 2005 with highly coherence.

Harvest Prediction of Winter Wheat in East Gansu Province

DUAN Jin-sheng1, 2(1.Institute of Arid Meteorology, CMA, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou 730020,China;2. Xifeng Experiment Station of Agro-meteorological in Gansu Province)

2007, 28(01):  17-20. 

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The relationship between temperature data and winter wheat growth data in last 35 years in East Gansu Province was analyzed. The results showed that climate warming made winter wheat mature early, because it speeded up both vegetative growth stage of winter wheat in early spring and reproductive growth stage in early summer. For predicting optimum date of local winter wheat harvest and providing direction to winter wheat production, the harvest prediction model was established, according to the filling speed and observed climatic data from May to June in last 11 years from Xifeng agro-meteorological experiment station. The predicted result accorded with ripe stage of local winter wheat in reality.

Changes and Mechanism of Soil Respiration on Winter Wheat Field in Low Mountain and Hill Regions of North China

WANG He-song1, ZHANG Jin-song1, MENG Ping1, GAO Jun1, REN Qing-fu1, JIA Chang-rong2(1. Research Institute of Forestry, CAF/Key Laboratory of Forest Silviculture of the State Forestry Administration,Bejing 100091, China. 2. Dagouhe National Forest Farm of Jiyuan)

2007, 28(01):  21-24. 

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Changes and mechanism of soil respiration on winter wheat field in low mountain and hill regions of North China were analyzed.The automatic observation systems Li-8100 and AR5 were used for the measurement of the soil respiration, and soil temperature and moisture respectively. The main results were as follows: (1)The soil respiration rate(SRR) on clear or cloudy day was markedly higher than that on overcast day before and after reviving. The diurnal variations of SRR were both demonstrated single-peak curve in clear or cloudy day and overcast day. (2) The SRR maintained at a relatively low level before reviving. While it increased rapidly after reviving,reached a peak during grain filling and decreased after harvest. The average SRR was 1.28μmol·m-2s-1 for the whole growing period, 0.63μmol·m-2s-1before reviving, and 2.18μmol·m-2s-1after reviving. (3) Significant relationship were found between SRR and soil temperatures at different depths (the surface, 5cm depth, 10cm depth, 15cm depth and 20cm dept, p<0.01), which could be best described by exponential equations,and the best was at 20cm.The Q10 of winter wheat from soil surface to 20cm depth were 2.09, 2.29, 2.39, 2.51and 2.63. Excessively low soil water content would restrain SRR. SRR was mainly affected by soil temperature, not significantly related to soil water content when it was at 20%-30%.

Comparison of Agro-climate Resources in Hainan and Taiwan Islands

WANG Sheng1, TIAN Hong1, WU Kun-di2(1. Climate Center of Anhui Province, Hefei 230036,China; 2. Meteorological Bureau of Hainan Province)

2007, 28(01):  25-28. 

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Based on observed climate data from 1971 to 2000, the characteristics of climate resources in Hainan and Taiwan islands was analyzed and compared. Results showed that radiation, heat and water resources in both islands were abundant. In the south of two islands were with highest temperature and hours of sunshine, which were lower in the middle mountain areas of two islands. The north Taiwan island and middle mountain areas of Hainan island had most precipitation and rainy days, which in the west of two islands had least.The tropical cyclone, the seasonal drought, the low temperature cold damage were the main agro-meteorological disasters both in the Hainan and Taiwan islands.

Effect of Various ngstrm-Prescott Coefficients on Reference Crop Evapotranspiration—A Case Study for the Middle Reach of Yellow River

LIU Xiao-ying, LI Yu-zhong(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences, Beijing 100081, China)

2007, 28(01):  29-35. 

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Effect of different ngstrm-Prescott coefficients on the reference crop evapotranspiration (ET0) was studied,using data series in last 50 years from 3 meteorological stations in the middle reach of Yellow River. The results showed that 56% and 93% variation of the ngstrm-Prescott coefficients(as& bs )in this region resulted in 0.6% -26.2% monthly variation, and 18.2-31.9%(173.1-197.4mm)annual variation for ET0. The effect of ngstrm-Prescott coefficients on ET0 was spatial dependent. It increased with the increasing of altitude and sunshine hours. It suggested that ngstrm-Prescott coefficients should be calibrated in regions with high altitude and intensive radiation. Though the ngstrm-Prescott coefficients were recommended by the FAO 56 PM to apply to the world wide, they could not been applied to in China directly according to this result. It seemed necessary to be validated and calibrated further to these coefficients.

Influences of High-frequency Drip Irrigation Mulched with Plastic Film on Soil Temperature and Moisture and Yields of Cotton (Gossypium hirsutum L.)

HU Xiao-tang, BAI Hui-dong, ZHANG Wang-feng(Agricultural College of Shihezi University, Shihezi 832003, China)

2007, 28(01):  36-39. 

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The field experiments were conducted to determine the influences of high-frequency drip irrigation mulched with plastic film on soil temperature and moisture and yields of cotton (Gossypium hirsutum L.). The results indicated that the high-frequency treatment irrigated 20 times more than the control treatments, and with more than 596.2mm irrigation water. The high-frequency treatment resulted in a higher soil moisture,lower water uptake resistance for cotton roots and a greater water consumption intensity up to 7.4㎜ per day. The soil temperature under the high-frequency drip irrigation during the growing stages was lower, and cotton roots distributed mainly in the upper soil. The high-frequency irrigation also led to the over vegetative growth, LAI being higher up to 6.6. However, the yield of cotton with the high-frequency drip irrigation was 111.45 kg/ha lower than that of the CK. Therefore, it was concluded that the high-frequency drip irrigation mulched with plastic film was of no significance in term of water saving in the practice.

Study on the Pattern of Water Requirements of Main Crops and Rainfall in the Yellow River Basin

SHAO Xiao-mei1,YAN Chang-rong2(1. Key Laboratory of Land Use/Ministry of Land and Resources, China Land Surveying & Planning Institute, Beijing 100035, China;2. Institute of Environment and Sustainable Development in Agriculture, CAAS)

2007, 28(01):  40-44. 

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Based on the data of 85 meteorological stations from 1961 to 2000 in Yellow River Basin, water requirements of main crops were calculated by using the Penman-Monteith model of FAO nominated in 1998 and consulting crop method. Results showed that the water deficit of winter wheat varied from 250 mm to 500 mm during the whole growing period, while it gradually increased from the south to the north of the region. The maximum water deficit of summer maize during growing period was with 200 mm occurred in the Guanzhong Plain, Shaanxi Province and reduced gradually to the east of the Yellow River Basin. The water deficit of spring wheat increased gradually from the south to the north with 200 mm to 500 mm, which was mostly affected by the rainfall. The water deficit of spring maize in the growing period varied from 0 mm to 400 mm, which increased gradually from the south to the north of the region.

Effects of Intercropping of Trifolium repens Linn. in Tea Plantation on Soil Temperature and Production in Subtropical Hilly Regions

SONG Tong-qing1, XIAO Run-lin1, PENG Wan-xia1,2, WANG Jiu-rong1, LI Sheng-hua3(1. Institute of Subtropical Agriculture, Chinese Academy of Sciences,Changsha 410125, China;2. Hunan Agricultural University;3. Xiangfeng Tea Factory, Changsha County)

2007, 28(01):  45-48. 

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Dynamic effect of intercropping Trifolium repens Linn. in tea plantation on spatial and temporal variation of soil temperature in the subtropical hilly region was studied. Results showed that soil temperature presented distinct character of spatial and temporal variation and hysteresis. As the intercropping of Trifolium repens had changed the nature of soil thermal exchange layer, e.g. soil surface, the daily soil temperature difference in the different soil layers had been decreased and stabilized when the temperature changed. The Trifolium repens Linn. covering showed a significant effect on surface soil temperature and in the noon time. The effect of Trifolium repens covering on lowing the soil temperature was most significant and on keeping temperature was moderate and on increasing the temperature was minimum. The more soil temperature decreased, the more air temperature increased. However, the effect on lowing and keeping temperature showed the same tendency as the air temperature decreased. The emergence of harmful high temperature in intercropping tea plantation was less than that in general treatment. Therefore, the intercropping of Trifolium repens Linn. in tea plantation could enhance the ability of ecosystem self-adjustment and improve the tea quality and yield.

A Review:Study on Water Conservation in Cropland with Stalk Cover

HU Shi1, 2, PENG Na1, XIE Xiao-li1, WANG Kai-rong1(1. Semitropical Institute of Agricultural Ecology, CAS, Changsha 410125, China; 2. Graduate School of Chinese Academy of Sciences)

2007, 28(01):  49-53. 

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Stalk cover changed not only the conditions out of soil, such as solar radiation, air temperature, air humidity and wind velocity, but also soil granule structure and water supply in soil. As result, it improved microclimatic conditions and mitigated soil moisture fluctuation in cropland. Because soil evaporation was reduced obviously in the earlier stage of crop growth, available water was increased during flourishing stage of crops.So water use efficiency was increased.

Studies on Simplified Agro-meteorological Models on Leaf Photosynthesis of Winter Wheat Including CO_2 Impacts

LI Ming-xing1, LIU Jian-dong1, WANG Fu-tang1, DAI Xiao-su2, LIU Wen-quan1, LIAO Yao-ming2(1. Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. National Climate Center)

2007, 28(01):  54-56. 

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Two simplified leaf photosynthesis models of winter wheat including the impact of CO2were established, based on the observed data which obtained with LI-6200 portable photosynthesis system in the experimental fields in Shandong Agricultural University. 50 group data were used in simulation to determine the parameters of models. The coefficients of correlation were 0.796 and 0.793. The validation of models using observed 77 group data showed that the simulation powers were almost the same as each other. The coefficients of correlation were 0.9613 and 0.9609 at 0.01% error possibility level. Therefore, the two models all possessed the trait of practicability. The model of hyperbolic form was simpler and easier to use than that of exponential form. So it could be used in the crop models as the sub-model of leaf photosynthesis, and was helpful theoretically to assess the impact of the variation of CO2concentration and temperature on the trend of production of winter wheat.

Ecological Climate Characters and Climatic Division of Aniseed(Illicium verum) in Guangxi Province

SU Yong-xiu, LI Zheng(Institute of Meteorology Disaster Reduction of Guangxi, Nanning 530022, China)

2007, 28(01):  57-60. 

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Based on requirement of aniseed (Illicium verum) growth and development to climate, soil and landform, climatic division of aniseed growing in Guangxi province was made with GIS technology and climatic resource in small grids analytic method, using observed climatic data from 90 meteorological stations and landform information on the scale of 1∶250000. Guangxi province was divided into 4 regions from suitable growing to unsuitable growing according to this division results. The special map of aniseed growing division was drawn out. Reasonable suggestions on distribution and development of aniseed were put forward.

Climate Division of Alfalfa (Medicago sativa L.) Planting in Nanping City

SHEN Chang-hua, LIU Xiao-xia (Agro-meteorological Experimental Station of Nanping City, Jianyang 354200, China)

2007, 28(01):  61-63. 

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Based on the meteorological data from 1951 to 2000 and research achievements on alfalfa (Medicago sativa L.), the climate division for alfalfa planting in Nanping City was made and the different zones were assessed. The local topography was considered in the division by using spatial analysis and multiple overlapping methods based on GIS combining the information of alfalfa growth with expert knowledge. The results provided scientific basis for the adjustment of agricultural structure.

Quality Regionalization of Hetao Honeydew Melon in Bayannaoer City Based on Meteorological Conditions

KONG De-yin, LIU Jun-lin, HOU Zhong-quan, ZHANG Lian-xia, CHUAI Xin-jun(Meteorological Bureau of Bayannaoer City, Linhe 015000, China)

2007, 28(01):  64-66. 

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The data of the sugar content of the honeydew melon and meteorology in Dengkou County were used for a correlation analysis to determine the suitable planting region of the honeydew melon. Agro-meteorological indices which influenced the sugar content of honeydew melon were determined. The comprehensive assessment model was established by stepwise regression method. The quality regionalization of honeydew melon in City star4.0 by using small grid computing model was made.

A Study on the Climate Ecological Adaptability and Division of Flos Lonicerae in the Sichuan Basin

PENG Guo-zhao1, QING Qing-tao2, XIONG Zhi-qiang2(1. Institute of Plateau Meteorology of Chengdu, CMA, Chengdu 610071, China;2. Agrometeorological Center of Sichuan Province)

2007, 28(01):  67-70. 

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Compared the climate conditions for flos lonicerae planting in the Sichuan Basin with it in the geo-authentic production regions, such as Fei and Pingyi County in Shandong Province,the climate ecological and environmental conditions and its influences on the yield and quality of flos lonicerae were studied. The main climate indexes which influenced the yield and quality of flos lonicerae growth and development were determined. The climate factor influenced model was established based on the GIS. The result of division showed that the most suitable planting areas of flos lonicerae in the Sichuan Basin was the northeast, such as Nanjiang and Tongjiang regions. However, the most parts of Muchuan region were sub-suitable or not suitable regions.

A Preliminary Study on Relationship between Sugarcane Yields and Meteorological Conditions in Main Sucrose Production Countries Worldwide

TAN Zong-kun, OU Zhao-rong, HE Yan(Guangxi Meteorological Institute, Nanning 530022, China)

2007, 28(01):  71-75. 

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The grey relation degree between sugarcane yield and meteorological factors over the years, such as temperature and precipitation, in the main sucrose countries worldwide, including Brazil and Australia was studied. It was concluded that the major meteorological factors and its crucial duration affected sugarcane yield in those countries had been determined. The results would establish the oretical foundation for the monitoring of global sucrose output and forecast service in China.

Establishment of Spatial Distribution Models and Grid Information System for Climate Data in Songnen Plain

LI Xiao-yan1, WANG Zong-ming2, SONG Kai-shan2, ZHANG Bai2, LIU Dian-wei2(1. School of Earth Science, Jilin University, Changchun 130061, China;2. Northeast Institute of Geography and Agricultural Ecology, CAS)

2007, 28(01):  76-79. 

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Based on digital elevation model (DEM) in Songnen Plain, 2 databases were built up with GIS technology. Geographical database depended on longitude, latitude and altitude, and topographical database depended on slope, aspect and sheltered degree. Then, the mathematic relationship between main climatic factors month-by-month and macro-geographical information was developed in Songnen Plain with the model of two trends-surface of three-dimension, using observed data including solar radiation, air temperature, rainfall and relative humidity, during 1961-2000 from all of the meteorological stations in this region. At last, the synthetic mathematic model of spatial distribution of climatic factors in Songnen Plain was completed, and the digital map with grid information 1km×1km on climatic factors in Songnen Plain was carried out with GIS technology.

All-weather Applicable Methodology to Retrieve Land Surface Temperature for Cold Disaster Monitoring

WANG Chun-lin1, TANG Li-sheng1, CHEN Shui-sen1, HUANG Zhen-zhu1, HE Jian1(1.Climate Center of Guangdong Meteorological Bureau, Guangzhou 510080, China; 2.Guanghzou Geographical Institute)

2007, 28(01):  80-87. 

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Acquisition of all-weather land surface temperature (LST) with high spatial resolution provided a precondition and ground work to monitor and evaluate cold disaster continuously. Thermal infrared remote sensing data of poly-orbit satellites, like MODIS, could be used to retrieve land surface temperature. Frame work to retrieve all-weather LST was put forward, applying climatology equations and GIS technique based on both remote sensing data of MODIS and ground observation data. Given clear condition, LST was retrieved with relatively high accuracy by band 1,2,19,31 and 32 of MODIS, otherwise, during unfavorable condition such as cloudy, high spatial resolution LST was derived by GIS technique combining with climate equations based on ground temperature observation. Methodology and operational flow of all-weather LST retrieving was introduced in the paper, with emphasis on parameters estimation. Comparison and accuracy analysis of LST retrieved through different ways showed feasibility of the methodology presented in the paper.

Analysis of Seasonal Dynamics of Vegetation Change in Shaanxi Province Based MODIS NDVI Time Series Data

ZHANG Shu-yu, LI Deng-ke, JING Yi-gang, LI Xing-min, GAO Bei(Shaanxi Remote Sensing Information Center for Agriculture, Xi’an 710014, China)

2007, 28(01):  88-92. 

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The advantage of MODIS vegetation monitoring was analyzed. The methods for establishing time series of vegetation indicator by using MODIS data in Shaanxi Province were discussed. According to the main types of vegetation-cover in Shaanxi Province, five specimen counties were selected in desert steppe, cropland and forestland regions. The NDVI parameters of character curve by MODIS NDVI series data in 2004-2005 were distilled. The rule of crop phonological stages and indexes of growing evaluate, explore the method of vegetation dynamic monitoring in Shaanxi province by remote sensing method were put forward, combined with the meteorology observation data and the summarized seasonal dynamics change character in the desert steppe, cropland and forestland. Finally, the problems and improvements of the method were discussed. The results showed that a significant relation existed between desert steppe NDVI and monthly precipitation. In the forestland NDVI had relation to the monthly temperature, but less sensitive to the precipitation. Time series of NDVI profile could reflect the dynamics of crop growth and development. It could be used to monitor and assess the growth and development of crops combined with crop phonological stages.

Application of Multi-sources Satellite Data in Monitoring Sugarcane Droughts

KUANG Zhao-min1, 2,3, ZHU Wei-jun1, DING Mei-hua1, 2,3, TAN Zong-kun1, 2,3, SUN Han2, 3(1. Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Remote Sensing Application and ValidationBase of NSMC; 3. Institute of Meteorology Disaster Reduction of Guangxi)

2007, 28(01):  93-96. 

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Drought was one of the most serious disasters in sugarcane production in China, as more than 80% of sugarcane was planted on arid land without irrigation. The research method of remote sensing monitoring on sugarcane droughts was studied in main sugarcane production area of Guangxi province with the DI model resulted from Vegetation Condition Index (VCI) and Temperature Condition Index (TCI), by using MODIS satellite data and ETM satellite data. The model was applied to monitor sugarcane droughts in the fall of 2004 and 2005, as the results, remote sensing map of temporal and spatial distribution was made. The simulated results accorded with droughts situation in reality, which indicated that the model could apply to monitor local sugarcane droughts.

Neural Network Prediction Model of the Lowest Temperature Based on Principal Component Analysis

SUN Hong-ping1, 2, YAN Shi-ming3, LI Pei-ren2, WANG Yan3(1.Nanjing University of Information Science & Technology, Nanjing 210044, China; 2.Weather Modification Office of Shanxi Province; 3. Shanxi Meteorological Institute)

2007, 28(01):  97-99. 

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Based on observed climatic data of precipitation and temperature from 6 meteorological stations in Shanxi province during 1951-2000, the prediction model of the lowest average monthly temperature in Taiyuan city was established with neural network technology and principal component analysis (PCA) method. According to this prediction model, the average relative error to the data series of 1960-1990 was 3.6%, and the prediction accuracy to 1991-2000 was 90%. The results indicated that the prediction model could improve prediction scale and precision significantly, and could take positive effect in reducing and preventing agricultural disasters.

Risk Assessment and Division of Drought Hazard Based on GIS in Chongqing City

LUO Pei(College of Land and Resources, China West Normal University, Nanchong 637002, China)

2007, 28(01):  100-104. 

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Taking the draught disasters in Chongqing as an example, with the adequately analyzing of weather background and population, society, economy in Chongqing, the author chooses these evaluation factors: the physiognomy, the frequency of disasters occurring, the population, the economy from the background of disasters, the possibility of disasters and the vulnerability of stricken things. By using hazy evaluation method, this thesis constitutes mathematics model for the background of weather disasters, the possibility of disasters and the vulnerability of stricken things, and at the same time the evaluation was made. Based on the basis datum and maps, with the utilizing MapInfo Professional software, in manipulating the attribute data-base and graphics data-base, the maps of the background of weather disasters, the maps of the possibility of disasters and the maps of the vulnerability of stricken things were gained. By overlaying and uniting of the maps and compartmentalizing of hazard grade, the hazard attributions for draught disaster were achieved.

Grey Correlation Analysis of Main Meteorological Disasters Affecting Grain Production in Fujian Province

ZHANG Xing1,2(1.Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Meteorological Bureau of Fujian Province)

2007, 28(01):  105-107. 

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Based on the statistical data of meteorological disasters from 1980 to 2004 in Fujian Province, the main meteorological disasters including drought, flood, typhoon and hailstones, and low temperature freeze were analyzed by using the grey correlation analysis. The results showed that the main meteorological disaster affecting the yield of early rice were typhoon and hailstones, while drought was the main disaster for late rice, single season rice and sweet potato. The drought and low temperature freeze were the main meteorological disasters for the grain production in Fujian Province. However, the impact of drought and flood had been increased since 1995.

A Preliminary Study on Relationship between Occurrences of Colletotnchum gloeosprioides penz of Lycium barbarum L. and Meteorological conditions

CAO Yan-long 1, ZHANG Wen-hua2, LIU Jing3(1. Institute of Wheat Breeding of Yongning County, Yongning 750100, China; 2. Agricultural School of Ningxia; 3. Key Laboratory for Meteorological Disasters Prevention and Reduction of Ningxia)

2007, 28(01):  108-111. 

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Based on the experimental and meteorological data in Yinchuan, Ningxia Hui Autonomous Region, the relationship between meteorological factors and occurrences of Colletotnchum gloeosprioides penz of Lycium barbarum was studied by correlation and regression analysis. The result showed that meteorological factors were highly related to the occurrences of Colletotnchum gloeosprioides penz of Lycium barbarum. The main meteorological factors included rainfall, rainy day, mean relative humidity, mean sunshine duration and mean breeze during fruit developing stage of Lycium barbarum. The rainfall, rain-days and mean relative humidity were more important than others.

Characters of Temporal and Spatial Distribution of Agro-meteorological Climate Resources and Their Impacts on Agricultural Production in Fujian Province

CHEN Jia-jin, CHEN Hui, MA Zhi-guo, LIN Jing(Institute of Meteorological Sciences of Fujian Province, Fuzhou 350001, China)

2007, 28(01):  40547-405. 

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Based on data of light, temperature and water in the last 30-40 years in Fujian Province, characters of temporal and spatial distribution of light, heat and water resources and their impacts on agricultural production were analyzed. Results showed that the quantity of heat became abundance generally since the 1990s but the low temperature damage and freeze often occurred. The precipitation resource was rich but the uneven inter-yearly distribution led to the occurrence of rainstorms and droughts and loss of agricultural production. The radiation concentrated in the growing period could meet the development requirement of crops and fruit trees.

Preliminary Analysis of High Temperature Harm at Middle-Season Rice Florescence on Jianghan Plain in Last 50 Years

LI Shou-hua1, TIAN Xiao-hai1, HUANG Yong-ping2, LIU Ai-ying3(1.Agriculture College, Yangtze University, Jingzhou 434025,China; 2. Jingzhou Experimental Station of Agro-meteorology; 3. Jingshan Middle School)

2007, 28(01):  40671-406. 

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High temperature harm at rice florescence was a big problem to rice production in the Yangtze River basin. Average temperature anomaly, the highest temperature anomaly, the frequency and temporal distribution of extra high temperature lasted 3d and 5d in July and August were analyzed respectively with tendency analysis and temperature anomaly analysis, based on observed temperature data from Jingzhou agrometeorological station during 1954-2003. The result showed that the average temperature and the highest temperature in Jianghan Plain did not increased in last 50 years. The frequency of average temperature≥30℃ lasted 3d and 5d, and the highest temperature≥35℃ in July and August increased a little. Extra high temperature weather occurred in the mid and last ten days of July and the first ten days of August in general. High temperature harm occurred more than 100%, and serious high temperature harm occurred 62% from mid of July to first of August. So adjusting rice-planting date and high temperature tolerant breeding to mitigate high temperature harm were recommended in this region.

Impacts of Climate Change on Growing Stages of Main Crops in Henan Province

YU Wei-dong1,2, ZHAO Guo-qiang1, CHEN Huai-liang1(1. Institute of Meteorological Sciences of Henan Province, Zhengzhou 450003, China; 2. Meteorological Bureau of Shangqiu City)

2007, 28(01):  40798-407. 

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Based on the crop growth stages and climate data of seven meteorological stations from 1981 to 2004 in Henan Province, the climate change and its impacts on main growing stages of winter wheat and summer corn were analyzed. The results showed that the growing stage from reviving to maturity stage of winter wheat became earlier and the postponed tendency of the jointing stage was the most obvious. The whole growing period of winter wheat had been reduced by 1.3 day per ten years.The main reasons caused the shorter growing period were that the average temperature increased from February to May and the sunshine hour reduced in March. All growing stages of summer corn were postponed and the postponed tendency of the maturity stage was the most obvious. The reduced total precipitation from Jun to September led to a postponed tendency of growing period of summer corn. Therefore, the whole growth period of summer corn had been increased by 2.1 day per ten years.