STUDY ON HIGH AND STABLE YIELD AREAS OF SOYBEAN IN NORTHEAST CHINA BASED ON DSSAT MODEL
As the main soybean producing area in China,the average annual sown area and yield of soybeans in Northeast China account for more than 50%of the country.It is of great significance to define the distribution characteristics of high and stable yield areas for the rational layout of soybean planting areas.Daily meteorological data and soil data from 99 meteorological stations in the study area from 1991 to 2020 were used to simulate soybean yield with different yield potentials based on the DSSAT-CROPGRO-Soybean model after parameter calibration and verification.The average yield and yield variation coefficient were used to divide high yield and stable yield.The study area was divided into four subareas:high yield and high stability,high yield and low stability,low yield and high stability and low yield and low stability.On this basis,the effects of precipitation and soil conditions on high yield and stable yield of soybean were discussed.The results were indicated as follows.(1)The distribution trend of soybean yield under the three yield potentials was low in the west and high in the east.The average soybean yield in Northeast China was the highest under the photon-temperature yield potential,followed by the climatic yield potential,and the climate-soil yield potential was the lowest.With the increase of limiting factors,the average yield of soybean decreased gradually.(2)The proportion of cultivated land area in soybean high producing area and high stable area decreased gradually,while that in low producing area and low stable area increased gradually.(3)The proportion of cultivated land area in the high-yield and high-stability area of soybean decreased gradually.The proportion of cultivated land area in the light-temperature yield potential was the highest,accounting for 62%of the study area,and the proportion of cultivated land area in the climate-soil yield potential was the lowest,accounting for 41%.The limit of precipitation on high yield and stable yield of soybean was much greater than that of soil.In summary,high yield and high stability area is the most suitable area for soybean planting,while high yield and low stability area is the potential high yield and high stability area.Taking some measures can improve the stability of yield potential.Based on decision support system for agrotechnology transfer model(DSSAT),the distribution characteristics of high and stable yield area of soybean in Northeast China are studied,which can rationally arrange planting area and expand planting area,and provide scientific and reasonable basis for improving soybean yield in Northeast China.
soybeanhigh and stable yield areasNortheast Chinadecision support system for agrotechnology transfer model(DSSAT)resource limitation
NETL
NSTL
万方数据
