中国山区耕地利用边际化表现及其机理 |
李升发,李秀彬 |
Economic characteristics and the mechanism of farmland marginalization in mountainous areas of China |
LI Shengfa,LI Xiubin |
图5 2013年中国各省玉米种植亩均用工数 |
Fig. 5 Per mu labor use for maize cultivation at provincial level in China in 2013 |