Table of Content

10 February 2001, Volume 22 Issue 01

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Cimatic Resource Advantage and Type Zoning for Planting Daye-tea in the Ailao Mountain

WANG Ming, YU Ling xiang (Yunnan Agrometeorological Centre, Kunming 650034)

2001, 22(01):  . 

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The climatic resource advantage for planting Daye tea in the Ailao Mountain is analyzed and rainfall, relative humidity and fog days in a year are selected as climate zoning indexes. All kinds of region of planting types of Daye tea in the Ailao Mountain was zoned.

The Main-elements Analysis of Yield Variation

BAI Jian (Agrometeorologic Center of Sichuan Province, Chengdu 610072)

2001, 22(01):  . 

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In this article, a two dimension yield matrix reformated from a historic yield sequence and then isolated by the way of spontaneous orthogonal division, three main elements which have influences on yield variation were obtained. These elenments including not only a tendentious sequence expressing artificial effect and anogher sequence expressing wether’s effect, but also a action besides man and wether which distinctly affects crop’s product. These elements are independent from each other and have no previous f models, so by this way, physical and perfect sequences can be supplyed for the product analysis or prediction. This result is important for the improvement of the precision of product prediction.

Analysis of the Characters of Plant Type of Summer Maize in Huanghuaihai Region

LIU Jian dong 1, YU Qiang 2, WU Nai yuan 3 (1.Chinese Academy of Meteorological Sciences, Beijing 100081;2.Institute of Geography,Chinese Academy of Sciences; 3.Research Center of Agrometeorology in Shandhong Province)

2001, 22(01):  . 

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A computer model was established for simulation of plant type of summer maize and the characters of plant type of three summer maize varieties were analysized. The results showed that inclination index changed with the growing stage of maize and the inclination indexes of three varieties were different from heading. The variety Yedan No.4 is -0.213,whereas that of variety Shendan No.7 could reach 0.095. Values of the area distribution of different summer maize varieties at different growing stage were given in this paper, which can be used as the basic parameters in the numerical model for simulation of agroclimatic resource in Huanghuaihai Region.

Effect of Malching with Straw on Water Regulation in Dryland of Maize

HU Fen, MEI Xu rong, CHEN Shang mo (Institute of Agrometeorology, CAAS, Beijing 100081)

2001, 22(01):  . 

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In order to decrease evaporation rates and increase WUE, water regulating experiment was carried out by mulching with straw from 1998~1999 in Shou Yang area where the precipitation is insufficient and seasonal drought occures frequently. The results showed that the effects of anti evaporation and the storage capacity are very marked by malching with straw, and the storage capacity of field is increaed, and the good cycle of soil moisture is promoted. Maize production and the WUE increased by 585～2235.1 kg/hm 2 and 0.14 ~0.50kg/(mm·hm 2) respectively.

Spring phonological Change in Beijing in the Last 50 Years and Its Response to the Climatic Changes

CHEN Xiao qiu 1,ZHANG Fu chun 2 (1.Department of Urban Environment, Beijing University. Beijing,100871; 2.Institute of Geography, Academic Sinica))

2001, 22(01):  . 

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Spring phonological change in Beijing in the last 50 years and its response to the climatic change were analyzed. Results show that (1) Spring phonological change in Beijing has interrelationship, synchronism and sequence regularity. (2) There are high correlation between spring pholological phenomenon and annual mean temperature as well as accumulated temperature in growing season. (3) the integral regression method was used to analyze the relation between temperature factor and spring phenophase in Beijing. The effect of spring temperature on phenophase is most important. At that time, the higher the temperature is, the earlier the phenophase occurs and vice versa. It is a therma sensitive stage on spring phenophase. (4) The temporal variation curve of spring phenophase in Beijing shows that at present spring phenophase in Beijing appears earlier. It is estimated that spring phenophase will appear earlier in the future 10 years.

Research of Establishing the Carrying Capacity Model on the Basis of Remote Sensing (RS) Information in Cool season Grassland

YANG Wen yi, WANG Ying shun, HE Jun jie (Institute of Animal Husbandy and Meteorology of Xilinguole League, Inner Mongolia, Xilinhot 026000)

2001, 22(01):  . 

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By using the herbage yield, Meteorological data and RS information of NOAA meteorological satellite in 1988~1997 to establish the model for estimation of berbage production in meadow steppt, steppt and desert steppe in Xilinguole League of Inner Mongolia. According to the residues of herbage in pasture land, utilization rate, lovestock intake rate, and the situation of snow corer ete. in cool season to establish the model. Using it to calculate the carrying capacity in order to provide the scientific theory for management and sustainable development of the ecological system of grassland. It is useful for the control of macroscopically stocking rate in cool season and mitigate economic losses.

Dynamic Changes of Soil Temperature in Wheat spring Cotton Relay Cropping System during Theirs Common Growing Period

ZHANG Bao min, SUN Ben pu, LI Feng yun (Institute of Agricultural Science of Binzhou City, Shandong Province, Binzhou 256615)

2001, 22(01):  . 

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Strictly using meteorological observation method, dynamic changes of soil temperature in wheat sping cotton relay cropping system during theirs common growth period were studied. Experimental results showed that soil temperautre in relay cropping cotton lines was lower than that in sole cropping cotton lines during their common growth period in wheat spring cotton, which made spring cotton seedling weak and developing slowly. The distance between rows of wheat cotton should be increased relatively. Soil temperature was highest. When chooseing relatively short wheat variety due to the reduction of the shade from wheat to cotton, and thus the soil temperature in wheat spring cotton relay cropping system is raised.

Influence of Altitudes on Effective Compositions of American Ginseng in Mountains of West Anhui

ZHU Ren bin, WU Qing sheng, WAN Zhi hu, DING Ya ping (Anhui Agricultural University, Hefei 230036)

2001, 22(01):  . 

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In this paper, the dry rate and content of total saponin, total sugar, reduced sugar and raw starch in American ginseng are determined. The effect of main climatic factors under different altitudes on them is also analyzed. The dry rate is higher in the range of altitudes from 600m to 900m and it is positively relevant to the effective accumulated temperature (R=0.8373). The content of total saponin is higher in the range of altitudes from 600m to 850m. While it is lower in the range of altitudes from 850 to 1000m and then rise suddenly above 1000m. It is positively relevant to sunshine duration (R=0.7352). The content of total sugar and reduced sugar rises with the altitude and they are negatively relevant to the temperature of 20 cm soil temperature in the growing season (R 1=-0.9870, R 2=-0.9628). The content of total starch is higher in the range of altitudes from 600m to 850m and it is positively relevant to the effective accumulated temperature.

Study on Microclimatic Characters and Yield Increase Potential of Different Populations of Ultra High-yielding Maize in Wumeng Mountain Area

ZHANG Bang kun 1, YANG Jian song 1, PENG Yu shu 2, ZHOU Qi jiang 3 (1.Department of Agriculture, Guizhou University, Guiyang 550025; 2.Agricultural Bureau of Dafang county of Guizhou; 3. Agricultural Bureau of Bijie County of Guizhou)

2001, 22(01):  . 

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In Wument mountain area of west Guizhou, under the conditions of using different varieties and plant densities with advanced cropping system and ultra high yielding technology, which are suitable for the relay cropping in certain width, the relationship between microclimatic characters in fields of ultra high yielding maize and its output is studied by parallel observing the growing status of maize plants and the microclimates index in the fields. The results showed that 4900 plants/667m 2 for variety 3638 and 4100 plants/667m 2 for variety Bidan 4 are rather good among all the tested varieties, their highest grain yield amounted to 631.6～728.6kg/667m 2 under this conditions, the turbulence flux of light, heat, water and wind in field is of the most advantage to achieve high yields.According to the calculation of climate resource this year, the grain yield of 1182~1244kg/667m 2 will be reached so the potential of increase of grain output is still very great.

Three Climatic Stages of Cotton Bollworm Living Through Winter in Xinjiang

ZHANG Jian hua, LI Ying chun (Xinjiang Meteorological Institute, Urumqi 830002)

2001, 22(01):  . 

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On the basis of former study and observed data of meteorology and cotton bollworm, it was analyzed the three climatic stages and temperatural dividing line index of cotton bollworm living through winter in Xinjiang. It is very important for climatic analysis and monitoring and forecasting of cotton bollworm.

Analysis of Temperature Elements Affecting Per Unit Area Output of Cotton in Akesu Cotton Region

YUAN Yu jiang, LI Xin jian, HE Qing (Xinjiang Institute of Meteorology, Urumqi,830002)

2001, 22(01):  . 

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By using the correlation analysis of cotton climatic output and temperature elements of different temperature types and different length periods of time in Akesu cotton region, the results obtained indicate (1) using daily temperature elements of different length periods of time correlated with cotton climatic output is more useful, more reasonable and more easily in founding out optimum temperature elements with biological significance than using ten days temperature elements; (2) In three temperature elements of mean temperature, maximum temperature and minimum temperature, the effect of maximum temperature on cotton climatic output is the greatest, mean temperature is greater, and minimum temperature is the least; (3) The low temperature in later spring and summer have some limiting effects on forming cotton climatic output in Akesu cotton region. The periods of time, in which temperautre elements have greatest influence on cotton climatic output in Akesu cotton region, are from cotton flowering to full flower stage in summer (July 14 to July 28) and from later spring to middle summer (May 17 to July 24), the later is the period of time from the first leaf to full flower stage. But that in Nongyishi is different, it is mainly in middle and later of summer (July 5 to September 3), which is about equivalent to the period of time from cotton flowering to the stage before cotton ball opening.