基于地形梯度的高山峡谷区耕地非粮化空间分异及分区治理研究OA

To clarify the situation of non-grain cultivated land in the alpine canyon area and its topographic gradient distribution pattern,so as to provide a scientific basis for similar regions to manage non-grain cultivated land according to local conditions.Based on the results of the Third National Land Survey and DEM data of Yulong County,Yunnan Province,the rate of non-grain cultivation of arable land was calculated from three aspects:planting structure,agricultural structure,and abandonment.The terrain position index and distribution index were used to analyze the topographic gradient characteristics of non-grain cultivation in arable land in mountainous and canyon areas,and differentiated governance suggestions were put forward.The results show that the total area of non-grain cultivation of arable land in Yulong County is 10319.90 hm2,and the overall non-grain rate is 23.04％,with non-grain cultivation structure and agricultural industry structure as the main ones.The pattern of non-grain cultivated land in Yulong County has obvious topographic differentiation,with non-grain agricultural industrial structure adjustment and abandonment mainly distributed in the middle and low terrain positions,and non-grain cultivation structure widely distributed in the middle and high terrain positions.Based on the law of topographic differentiation,Yulong County can be divided into four types of non-grain cultivation of arable land:dam-area abandonment and industry-supporting type,middle-and high-altitude mountainous area economic-interest-driven type,steep-slope productivity-constrained type,and alpine mountainous active-exit type.The hierarchical distribution pattern of non-grain cultivation of arable land across topographic gradients in mountainous and canyon areas should be fully respected,and location-specific governance of non-grain cultivation should be implemented.