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利用ARC/INFO的空间分析与统计分析功能,从海拔、坡度、土壤以及土地利用四个方面,对藏东横断山区土壤侵蚀的空间分布特征进行了研究。结果表明:(1)从总体上来讲,三江河谷地带水蚀较强;山体中部以微度侵蚀为主,而森林采伐迹地土壤侵蚀严重;海拔4500m以上地带,冻融侵蚀严重。(2)不同的海拔与坡度等级下,4000-5000m与25°-35°土壤侵蚀最强。(3)水力侵蚀主要发生在褐土与灰褐土土壤类型,冻融侵蚀主要发生在寒冻土、黑毡土以及草毡土土壤类型。(4)土壤侵蚀主要发生在草地和林地,低覆盖草地上冻融侵蚀尤为严重。通过土壤侵蚀分布特征的研究,为土壤侵蚀防治对策提供科学依据。
Using the spatial analysis and statistical analysis function of ARC / INFO, the spatial distribution characteristics of soil erosion in the Hengduan Mountains of eastern Tibet were studied from four aspects: elevation, slope, soil and land use. The results show that: (1) Generally speaking, the water erosion in the Sanjiang River valley is stronger; the central part of the mountain is dominated by micro-erosion, while the soil erosion is serious in the deforested forest; (2) Under different altitudes and grades, soil erosion is the strongest in 4000-5000m and 25 ° -35 °. (3) Water erosion mainly occurs in the soil types of cinnamon soil and gray cinnamon soil. The freeze-thaw erosion occurs mainly in frozen soil, black felt soil and straw soil type. (4) Soil erosion mainly occurs in grassland and woodland, and the freeze-thaw erosion on low-coverage grassland is particularly serious. Through the study of distribution characteristics of soil erosion, it provides a scientific basis for soil erosion control measures.