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针对林下水土流失缺乏有效判别方法的问题,提出了一种遥感判别方法。该方法以植被覆盖度、植被健康度、土壤裸露度和坡度为判别因子,采用规则法来建立林下水土流失遥感判别模型,并将其应用于福建省长汀县。结果发现,长汀县有311.66 km~2的林地发生不同程度的林下水土流失,其中有13.35%的土壤侵蚀强度达到中度。通过遥感方法识别出的林下水土流失区的空间分布位置可为该县今后深入治理水土流失提供目标靶区。
Aiming at the problem of lack of effective discriminant method of soil erosion under forest, a remote sensing discriminant method is proposed. The method takes the vegetation coverage, the vegetation health, the soil bareness and the slope as the discrimination factors, and uses the rule method to establish the remote sensing discrimination model of soil and water erosion in the forest and applies it to Changting County, Fujian Province. The results showed that there was 311.66 km ~ 2 forests in Changting County with different degrees of soil erosion, of which 13.35% of the soil erosion intensity reached moderate. The spatial distribution of soil and water loss areas under the forest identified by remote sensing can provide the target area for the further erosion and water loss control in this county.