Table of Content

10 June 2000, Volume 21 Issue 03

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论文

A Quantitative Model of Corn Seeds Germination under Different Temperature Conditions

WANG Li zhi, WANG Lian min 1, ZHANG Guo min 1, LIU Gong 1, SHI Feng 2 (1.Crop Cultivation Institute of Heilongjiang Academy of Agricultural Sciences, Harbin 150086; 2. Agronomy Department of Heiliongjiang Nongken Agricultural School)

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three corn varieties (Longdan 5, Sidan 19 and Jidan 159) were used in this experiment to study the relationship between seed germination and time duration under different temperatures. The temperature was controlled at 13℃, 17℃, 21℃ and 25℃, respectively. The results showed that the percentage of seed germination and the needed time at different temperatures were coincident with the growth curve function: y i=c1+e a+bx i

Factorial Analysis on the Variation Features of Climatic Yield of Summer Crops in Gansu Province

YIN Dong, KE Xiao xin, FEI Xiao ling (Lanzhou Institute of Arid Meteorology, Lanzhou 730020)

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Based on the yield data of summer crops of the counties in Gansu province, the variation features of the climatic yield of summer crops in spatial and temporal distribution have been analyzed by using R and Q type factorial analysis after calculating the series of the climatic yield of summer crops of the counties.

Study on the Change of the Accumulated Temperature in North China and Northeast China

MAO Heng qing, WAN Hui (National Meteorological Center, Beijing 100081)

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In this paper, the accumulated temperatures higher than 0℃ (T≥0℃) and 10℃(T≥10℃) in North China and Northeast China during the period of 1956~1995 are calculated, and their change tendency are analyzed. The results indicate that the accumulated temperature in North China and Northeast China has an obvious changing tendency, and in 80~90’s the accumulated temperature raised gradually as a wave. The accumulated temperature is closely related to the duration of T≥0℃ (or T≥10℃) period and their changing tendency are similar. The results of the regression analysis between the accumulated temperature and the duration of T≥0℃ period and mean annual temperature show that if the mean annual temperature raise 1℃ the accumulated temperature of T≥0℃ will increase about 117～252℃·d and the duration of T≥0℃ period will extend about 5～13.5days.

Study and Application of Drought Index During the Transplanting Period of Rice in Jiangsu Province

ZHANG Xu hui, HUANG Yu hua (Meteorological Institute of Jiangsu Province, Nanjing 210008)

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A method for calculation of drought index based on precipitation and evapotranspiration is described. According to this method, drought criterion can be decided. Furthermore, the occurrence pattern of drought during the transplanting period of rice is discussed and prevention strategy is discussed.

Meteorological Forecast and Serving System for Cotton

GE Hui yan 1, ZHANG Yong hong 1, XIAO Ke li 2, DU Yu long 2, LI Zhao yuan 3 (1. Shaanxi Provincial Cotton Meteorological Service Station, Weinan 714000; 2.Meteorological Office of Weinan City; 3.Shaanxi Provincial Meteorological Research Ins

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The system is a conbanation of many kinds of statistic methods for meteorological forecast of cotton. The design thought of the expert system is close to the cotton field production management. It is a three in one comprehensive decision making computer system, which is geared to the needs of users in cotton meteorological information service. This meteorological forecast system for cotton and the production management subsystem are consist of database, methodological database, index data base, countermeasure database, inferential module, and product forecast module. The information consultation subsystem consists of the information history of cotton production, current cotton information and the prediction of cotton production in the future, information on cotton production management and other related information. The system provides a good synthetic environment for the system users in decision making results of four years practical use showed that the service level in decision-making of cotton meteorology has been improved significantly.

The influence of spring wheat with insufficient irrigation at new irrigated region in Ningxia

MA Li wen, WANG Lian xi, LI Feng xia, LIU Chun quan, LI Jian ping (Ningxia Meteorological Research Institute,Yinchuan 750002)

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By using the experimental data of spring wheat obtained at new irrigated region in Guangwu, the relationships among yield and water use efficiency of spring wheat and components of water balance equation were studied The sensitivity of water shortage at different growing stages during the growing period of spring wheat is analyzed and irrigation plan is established according to the determined optimum irrigation norm by a single factor evaluating matrix of input and output

The Temporal And Spatial Distribution of Maize Frost Damages in China

FENG Yu xiang, HE Wei xun (Institute of agrometeorology, Chinese Academy of Agricultural Sciences, Beijing 100081)

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Based on the data of mize frost damages in China, an analysis was conducted. The regional distribution of frequency, tendency of interannual variation, the percentage of autumn frost damages on maize were expounded. Some problems of frost prevention were discussed.

Study on Microclimate Environment in Population of Erect Panicle Type Rice

GAO Shi jie 1, ZHANG Long bu 2, CHEN Wen fu 2 (1.Jilin Academy of Agri.Sci., Gongzhuling 136100; 2.Shenyang Agricultural University)

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The microclimate environment in population of erect panicle type and curved panicle type rice is determined. Results showed in population of erect panicle, the effect of panicle morphology on light distribution in canopy was conspicuous, and occurred mainly in the middle and top layers of the canopy. In the canopy of population of erect panicle type, the light distribution was more unform and improvement in the up-layer. The temperature in erect panicle population was higher than that of curved panicle population and it was more humid in erect panicle population than in curved panicle population, which was favorable to the improvement of photosyhtesis efficiency. The concentration of CO 2 in the up-layer of the erect panicle population was higher than curved panicle population and it was lower than curved panicle population in the middle and bottom layers of the canopy. It was concluded that erect panicle population is well ventilated in the up-layer, and photosyntesis was strong in the middle and bottom layers of the canopy.

Effects of Enhanced UV-B Radition on Seed Germination and Growth of Seedling

WANG Chuan hai, ZHENG You fei, WAN Chang jian, SONG Yu zhi, ZHANG Fu cun (Nanjing Institute of Meteorology, Nanjing 210044)

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Effects of enhanced ultraviolet radiation (UV B, radiation, broad band, 280~400nm) on the germination of seed and growth of seedling were investigated. The results show that the enhanced UV B radiation greatly inhibited seed germination process and the growth of seedling. Different crops have a great different sensitivity to the enhanced UV B radiation. The results also show that the sensitivity to enhanced UV B radiation of the root is nearly to that of the stem and leaf.