ANALYSIS ON THE CLASSIFICATION OF SLOPING CULTIVATED LAND AND ITS BASIC CHARACTERISTICS IN THE NORTHEAST MOUNTAIN REGION OF YUNNAN PROVINCE
ANALYSIS ON THE CLASSIFICATION OF SLOPING CULTIVATED LAND AND ITS BASIC CHARACTERISTICS IN THE NORTHEAST MOUNTAIN REGION OF YUNNAN PROVINCE
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发表时间：
1999
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通讯作者：
Yang Zisheng
中科院分区：
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作者：
Yang Zisheng
从研究山区土壤侵蚀与坡耕地合理利用的角度出发，提出了一般意义上的坡耕地概念，建立了坡耕地分类体系。利用土地利用现状调查数据，计算了滇东北山区坡耕地的数量。利用6个指标分析了该区坡耕地的基本特征。主要结论如下：1.一般意义上的坡耕地是指坡度在2°以内的所有耕地。2.坡耕地的分类系统是：等高线_耕地梯田水田梯田水浇地待雨水田梯田水浇地梯田非水浇地菜地坡地_耕地坡地非水浇地轮作休耕地。滇东北山区坡耕地分布广，面积大，坡耕地指数（I）值达94.52%。坡耕地面积占坡耕地面积的优势，坡耕地指数（IS）达到87.87%，等高耕地指数（IC）仅为12.13%。坡耕地地形坡度大，25°（I SS）陡坡耕地面积占坡耕地总面积的17.71%，6°和15°（I S6和I C15）陡坡耕地面积分别达到78.97%和90.74%。这是无节制开发土地和长期破坏森林的具体体现，也是该地区水土流失严重的主要原因。
From the point of studying soil erosion and rational utilization of sloping cultivated land in mountain region, the paper puts forward the concept of sloping cultivated land in general sense, sets up the classification system of sloping cultivated land. According to this system and the data of land use status investigation, the paper gains the amount of every sloping cultivated land type in the northeast mountain region of Yunnan provice. Using six indexes, this paper analyses the basic characteristics of sloping cultivated land in this region. The main conclusions are: 1. The sloping cultivated land in general sense is defined as all cultivated land in the slope of 2°. 2. The classification system of sloping cultivated land is the following: Contour__cultivated landterraced paddy fieldterraced irrigated paddy field wait_to_rainfall paddy field terraced landterraced irrigated land terraced non_irrigated land vegetable land Slope_cultivated landslope non_irrigated land rotation_fallowed land 3. In the northeast mountain region of Yunnan provice, the distribution of sloping cultivated land is very broad, and its area is very large, the value of sloping cultivated land index (I) has arrived at 94.52%. Slope_cultivated land area occupied an advantage in all sloping cultivated land, the value of slope_cultivated land index (I S) has arrived at 87.87%, and contour_cultivated land index (I C) was only 12.13%. Moreover, the topographic slope of sloping cultivated land is big, the area of steep cultivated land in the slope of 25° (I SS ) has occupied 17.71% in total sploping cultivated land area, and the index of slope of 6° and 15° (I S6 and I C15 ) arrived at 78.97% and 90.74% respectively. This is the concrete embodiment of exploiting intemperately land and destroying long_standingly forestry, also the main causes for the serious soil erosion in this region.