关键词: 白羊草, 白羊草, BiCDPK, 基因克隆

Abstract: To understand the reason of cropland abandonment and protect quantity and quality of farmlands and then ensure national food security and social stabilization, based on the Landsat TM/OLI remote sensing data and data of questionnaire survey, the spatial and temporal distribution and driving force of cropland abandonment in Kongtong District was studied by satellite image interpretation and binary logistic regression model. The results showed that: (1) from 1995 to 2015, the area of abandoned farmland in Kongtong District increased by 5012.06 hm2, which included 3221.13 hm2 during the first ten years and 1790.93 hm2 during the next decade; (2) in the past two decades, the abandoned farmland mainly distributed on the hillside field of mountainous region of slope between 5°and 20°; (3) among the 10 factors affecting farmland abandonment in Kongtong District, except the regression coefficients of the family size, the farmland quantity and the yield were relatively small; other factors had greater regression coefficients. Therefore, in Kongtong District, socioeconomic factors were the primary driving forces for the farmland abandonment, and the land marginalization, which was due to the drastic increase of farming opportunity cost, was the fundamental cause, while the direct factor for abandonment was the shrink of agricultural labor forces.