Chinese Journal of Agrometeorology

The Relationship between ENSO and Harvests of Summer Crops in Shaanxi Province

JING Yi gang (Shaanxi Remote Sensing Information Center for Agriculture, Xi’an 710015)

2000, 21(02): .

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In this peper, we analysed the influence of ENSO on synoptic climate in Shaanxi Province. The results show that if ENSO happens, droughts will occur in autumn in the current year and next spring, the amount precipitation in next fall will be rather much. So when ENSO happens the yield of summer crops will below the average in the next year, and that will above the average in the third year. Besides, Southern Oscillation and the rainfall of Indian monsoon relative to EL Nino also influence the harvests of summer crops. Ahear of 1～2 years, we can comprehensively forecast the harvests of summer crops by using ENSO data.

Hygienic Evaluation on the Microclimate of Double-Plastic-Greenhouse for Pig in Winter in the Middle of Hebei Province

LIU Chun yan, WANG San li (Langfang Agricultural School, Hebei Province, Langfang 065000)

2000, 21(02): .

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The microclimate of mixed pig house for raising sows, fatten pigs and farrows in double plastic greenhouse in the middle of Hebei Province was observed in winter. It was found that the temperature and sunlight intensity in the greenhouse were 5.2～19.1℃ and 15000lx respectively in sunny day, 6.1～13.0℃ and 3000lx respectively in cloudy day, the humidity in it was 71%～84%, and the ammonia concentration was 11.6～26.8mg/m 3. Compared with the hygienic standard, the result showed that the temperature is still lower, the ammonia concentration is beyond the standard sometime, the humidity is slightly higher, and the sunlight intensity is too strong.

Spatial and Temporal Analysis on Agricultural Drought under Double Cropping System in Beijing-Tianjin-Hebei Plain area

YUAN Guo fu, WU Lian hai (College of Resource and Environmental Sciences, Chinese Agricultural University, Beijing 100094,China)

2000, 21(02): .

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Drought is a severe natural hazard in agricultural production in Beijing Tianjin Hebai Plain Area (BTHPA) in the North China Plain. A new agricultural drought index (CSDI) expressed by a relative yield was introduced, and spatial and temporal variations of agricultural drought in this rainfed area were analyzed. Through analysis of the CSDI values of 18 representative spots distributed in BTHPA from the year of 1961 to 1990, four types of agricultural drought in this area can be concluded. According to the severity of agricultural drought, the area could be divided into four regions, i.e. the northeast coastal plain with light drought, the north plain and east coastal plain with medium drought, the central plain and west plain with heavy drought, and Hei Long Gang area with extreme severe drought. Risk analysis on agricultural drought further revealed the possibility of drought stricken in agricultural production in the area.

Defining the Index for Cutting Invalid Cotton Bolls and Exploring the Forecast Model

LIU Yao wu 1 WANG Jian ping 2 GAO Ying 3 (1. Shaanxi Meteorology Institute, xian 710015; 2. Shaanxi Provincial Meteorological Bureau; 3. Xianyang Meteorological Station)

2000, 21(02): .

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According to the results of experiments and investigations, it is determined that the boll-weight smaller than 2.5g is the index of boll-weight of invalid cotton bolls in Guanzhong region. Based on the quantitative rations relation between boll weight and heat conditions during the boll-setting period, the heat smaller than 235℃·d is determined as the heat index of invalid cotton bolls. In Guanzhong region, the daily mean temperature is larger or equal to the effective accumulated temperature of 15℃. Methods for calculating the data of cutting invalid bolls are advanced. The Markov Forecast model of cuting invalid bolls in Guanzhong region has been built, and good results are obtained in example analysis and tests.

LI Yan qi (Hebei Meteorological Institute, Shijiazhuang 050021)

2000, 21(02): .

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By similar selection analysing remote sensing data of a period time of a year and the remote sensing data of a period of the check year the degree and district of farm crops suffering dought were determined. This method has a certain practicality and objectivity.

Prelimiary Studies on the Meteorological Effects of Covering Ground Around Tree Trunks in Orchard with Different Materials in Hilly Areas

LIU Ke chang, REN Zhong xing, ZHANG Ji xiang (Dept. of Agri. Meteorology, Shandong Agri. Univ., Taian 271018)

2000, 21(02): .

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The meteorological effects of covering ground around tree trunks with different materials in peach orchard and their relations to the peach outputs and qualities were studied. The results show that in orchard where the grounds are covered with different materials, the total radiation inside the tree crowns obviouily increased, especially the ground where is covered with silver film, the radiation increased by 24%, which is the greatest; The physical characters of the soils are improved, the soil moisture and porosities greatly increased; The fruit outputs and quanlities are improved, especially on the ground where is covered with the silver film; Among the different materials, the silver films’ meteorological effects are most obviously and the wheat straws are most economically and practically.

Analysis of the Inside Temperature and Humididy Control of Holland Glass Greenhouse in Shanghai

HE Fang fang (Shanghai Meteorological Research Institute, Shanghai 200030)

2000, 21(02): .

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Mathematical statistics methods were used to analyse the relationship between temperature and humidity inside and outside of greenhouse, pipe temperature, open extent of ventilation window. Some basic laws of temperature and humidity control in greenhouse in winter, spring and autumn were obtained.

The Status and Advances of Thermal Inertia Models in Measuring Soil Moisture by Remote Sensing in China

LI Ya chun 1, XU Meng 2, TANG Yong 2 (1.Nanjing Institute of Meteorology, Nanjing 210044; 2.Jiangsu Meteorological Research Institute)

2000, 21(02): .

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The model of thermal inertia, which is one of the main techniques of monitoring soil moisture by remote sensing is described in this paper. The applications and studys of this model in China are reviewed and some problems are also discussed.

Study on the Climatic Possibility of Three Crops a Year in Youjiang Basin

WEI Jing hua (Guangxi Meteorological Bureau, Nanning 530022)

2000, 21(02): .

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The climatic study on the possibility of changing two crops into three crops a year in Youjiang Basin Rice Area was carried out. The three crops are spring corn, midseason rice and fall or winter corn. The technical measures for growing three crops a year were also discussed.

Study on the Climatic Conditions for Production of High Quality and Moderate Yield of Tobacco in Yunnan Province

ZHANG Jia zhi (Meteorological Bureau of Yunnan province, Kunming City 650034)

2000, 21(02): .

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The climatic conditions of the main tobacco areas in Yunnan Province and that in other provinces as well as in foreign countries were studied. The results of the study revealed the climatic characterisics for production of high quality and moderate yield of tobacco in Yunnan Province and provided scientic references for the plantting regionalization of tobacco.

Calculation and Analysis on Water Requirements of Major Crops in Northern China

ZHONG Zhao zhan, ZHAO Ju bao, YU Xiao chuan, JU Hui (Agrometeorology Institute, Chinese Academy of Agricultural Sciences, Beijing 100081)

2000, 21(02): .

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The concept of crop water requirements was discussed, based on which the calculation model of crop water requirements was established. Based on crop, soil and meteorological data, the water requirements of major dry crops in northern China, including wheat, maize, millet, sweet potato and potato, were calculated, and the patterns of water requirements of these crops were revealed and discussed in this paper.

Response of Cropping System in China to Global Climatic Changes Ⅱ. Effect of Cropping System in China to Global Climatic Changes

ZHANG Hou xuan (Institute of Agrometeorology, CAAS, Beijing 100081)

2000, 21(02): .

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The effect of global climatic change and the characteristics of China’s agriculture was studied. The main problems of China’s cropping system in response to climatic change were discussed from the cropping plan, input in science and technology, protective tillage breed good varieties, and using water - saving culture of the point of view. Some available countermeasures and technological steps were recommended. Keyword: Cropping system; Climatic change; Responsible countermeasures

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