摘要
从研究山区坡耕地水土流失与合理利用和改造的角度出发，提出了坡耕地的广义概念，建立了坡耕地分类系统；按此系统归并现有土地详查成果数据，得出了滇东北山区各类坡耕地数量；采用６个指标，分析了本区域坡耕地的基本特征。
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.
出处
《山地学报》
CSCD
1999年第2期131-135,共5页
Mountain Research
基金
国家自然科学基金
关键词
滇东北山区
坡耕地
分类系统
基本特征
分析指标
Northeast mountain region of Yunnan province, sloping cultivated land, classification system, basic characteristics, indexes of analysis
