Abstract:

Based on the daily meteorological data of the three provinces in Northeast China from 1961 to 2020 and the soybean crop coefficients of the research area, the progressive correction method was used to calculate the photosynthetic, photosynthetic temperature and climate production potential of soybeans in various regions of the three provinces in Northeast China. ArcGIS was used for analysis to explore the spatial and temporal variation laws of production potential at all levels, as well as its coefficient of variation, anomaly percentage, and realization rate. Countermeasures for the development and utilization of production potential were proposed. The results indicated that the spatial distribution of production potential in the three provinces in Northeast China was that the distribution trends of photosynthetic and photosynthetic temperature production potentials were increasing from north to south, and climate production potential was highest in eastern Liaoning, followed by central Jilin and south-central Heilongjiang, with the lowest in northwest of Heilongjiang. The photosynthetic production potential anomaly change rate was between -18% and 11%, with a change interval closing to 30 percentage points. The photosynthetic temperature production potential and climate production potential anomaly change rates had a wide range, with 70-80 percentage points. The coefficient of variation of photosynthetic production potential was mostly below 5%, while that of photosynthetic temperature production potential was mostly below 10%. The coefficient of variation of climate production potential was as high as about 20%, and the lowest was still above 10%. The stability of climate production potential was poorer than that of photosynthetic temperature and photosynthesis. The spatial distribution of actual soybean yield in the three provinces in Northeast China matched that of the realization rate of production potential, and both were higher in central Jilin and eastern Heilongjiang. We can choose to expand soybean cultivation in regions with higher realization rates of production potential at all levels, appropriately raise the construction standards of high-standard farmland, build irrigation and drainage facilities to ensure optimal water supply, and effectively improve the contribution of photosynthetic temperature resources to soybean yield increase.

Key words: Three Northeastern Provinces, soybean, climate, production potential, soybean expansion, changes in production potential, production potential realization rate