岩溶地区水土流失强度的等级划分研究——以毕节岩溶区为例

Grade Classification of Soil Erosion Intensity in Karst Area——With Bijie Karst Area as an Example

以毕节岩溶区为例,针对岩溶区水土流失强度等级划分中存在的问题,将主成分和聚类分析法应用于岩溶区水土流失强度等级划分中,力求更客观地对岩溶区水土流失的强度进行等级划分,同时在方法上进行新的探索。选择与该地区水土流失密切影响因子作为评价指标,构建了毕节岩溶区水土流失强度评价指标体系,然后利用主成分及聚类分析法对毕节岩溶区的8个县市进行了水土流失强度等级划分。结果表明,毕节8个县市中,有轻度水土流失县1个,中度水土流失县5个,强度水土流失县2个。研究结果比较客观地反映了毕节岩溶区水土流失的现状,可为该地区的水土保持与治理提供依据。

In light of the problems in soil erosion intensity classification, principal component analysis and clustering analysis method were applied in soil erosion classification of Bijie karst area as an example for exploring new classification method which reflects the reality better. A number of impact factors of soil erosion were chosen as the evaluation indices to build an evaluation index system, which forms the basis for the soil erosion intensity classification in the eight counties of Bijie karst area. The results showed that one county experienced mild soil erosion, five were moderate erosion grade and two were severe. The findings reflected well the current situation of soil erosion in Bijie karst area, and can provid the basis for soil and water conservation and management in the region.