摘要
1999年与 1 987年两次遥感调查结果对比分析表明 ,云南省水土流失面积减少 5 0 97km2 ,全省轻度、极强度和剧烈流失面积呈减少趋势 ,而中度与强度流失面积呈增加趋势。 1 989年开始实施的“长治”工程范围内水土流失面积明显减少 ,部分县水土流失面积减少 37%～ 47%。全省人为水土流失虽仍较严重 ,但治理速度大于破坏速度 。
Based on the comparative analysis of results through remote sensing investigation respectively in 1987 and 1999, it is demonstrated that the area of soil and water loss decreased by 5 097 km 2, the areas with slight erosion, extreme intensive erosion and severe erosion are all in descendent trends,but the areas with medium erosion and intensive erosion increased. There has a evident decrease of soil and water loss area in the region of“Yangtze River harness”project started from 1989 with reduction of 37% to 47% of soil loss areas in some counties. Although there are still serious soil and water loss in whole province, the controlling speed is faster than that of artificial erosion.Generally speaking, the trend of soil erosion has been preliminarily under control.
出处
《中国水土保持》
2000年第7期6-7,共2页
Soil and Water Conservation in China
关键词
遥感调查
水土流失面积
水土流失强度
云南
remote sensing investigation
soil and water loss area
soil and water loss intensity
Yunnan province
