Grid-based Study on the Potential Crop Productivity of Cultivated Land in China

摘要

By integrating the land use dada extracted from remote sensing imaging, meteorological data and crop production model in GIS environment, this paper takes winter wheat as a case to calculate and evaluate the potential crop productivity of cultivated land limited by radiation and temperature, namely photo synthetic thermal productivity in China based on 1 km×1 km grid. The results show: With the changing of spatial position, the winter wheat photosynthetic thermal productivity of cultivated land in China is usually changing from 3000 kg/ ha to 14150 kg/ha. Furthermore, we compare the potential productivity of provinces with actual yield of ten main production provinces of winter wheat by combining China's administrative boundary map and potential land productivity map. In ten main production provinces, winter wheat PTP of most provinces is close to or more than 7000 kg/ha except Sichuan province's is 4211 kg/ha. The highest is Jiangsu province (9930 kg/ha), the lowest is Sichuan province (4211 kg/ha). There are five provinces where winter wheat utilizing efficiency of radiation and temperature are higher than 50%, Sichuan province is the highest (71%), the lowest is Shaanxi province, due to lack of water, only 35%.