Institute of Land Resources and Sustainable Development Yunnan University of Finance and Economics Kunming 650221 China;
Institute of Land Resources and Sustainable Development Yunnan University of Finance and Economics Kunming 650221 China;
Institute of Land Resources and Sustainable Development Yunnan University of Finance and Economics Kunming 650221 China;
Cultivated land; Scale; Prediction; Cultivated land protection; China; Ordinary least square(OLS)regression model;