红壤丘陵区不同土地利用方式下的土壤侵蚀特征

首先利用TM遥感图像解译出2000年兴国县土壤侵蚀强度图及土地利用图，在GIS的支持下，通过对2图的叠加分析，来研究典型红壤丘陵区不同土地利用类型上不同土壤侵蚀的分布特征。结果表明，强度侵蚀主要分布在裸地、旱地、草地及园地类型上，中度侵蚀主要分布在疏林地、草地及旱地上，而轻度侵蚀在各种土地利用上均有不同的程度的分布，但主要集中在疏林地上，旱地及草地次之。这说明建造良好的植被条件是防止强度土壤侵蚀发生有效途径。从土壤侵蚀率上来看，裸地、旱地、草地及园地是严重土壤侵蚀集中分布的几种土地利用类型，文章最后从土地合理利用的角度，提出了相应的土地利用建议。

SOIL EROSION CHARACTERISTICS UNDER DIFFERENT LAND USE TYPES IN HILLY RED SOIL REGIONS

The soil erosion intensity map and the land use map of Xingguo county of China's Fijian province were interpreted based on remote sensing data(TM) in 2000.By overlaying the two maps in GIS environment,soil erosion characteristics under different land use types were studied.Distribution of light,moderate and severe erosion varied with land use types.Severe soil erosion mainly occurred on naked land,dry land,grassland and orchard land.Moderate erosion was observed mainly in sparse forests and on grassland and dry land.Light erosion was distributed in all land use types studied and mostly distributed in sparse forests,followed in order by dry land and grassland.It is thus concluded that well kept vegetation is a good way to avoid sever soil erosion in hilly red soil regions.Based on soil erosion rate,naked land,dry land,grassland and orchard land are vulnerable to soil erosion.Some proposals of policy options are put forward for reasonable development of the land.