基于抽样调查资料估算区域土壤侵蚀量

发布时间：2018-06-10 11:46

本文选题：抽样调查资料 + 中国土壤流失方程(CSLE)　；参考：《中国水土保持科学》2017年01期

【摘要】：区域土壤侵蚀量估算是土壤侵蚀调查的重点和难点,为了利用抽样调查数据定量估算区域土壤侵蚀状况,以2011年第1次全国水利普查中的水力侵蚀抽样调查资料为基础,利用中国土壤流失方程(CSLE),通过地理信息系统估算2011年辽宁省的降雨侵蚀力、土壤可蚀性、地形、水土保持措施等侵蚀因子及侵蚀量,在此基础上对全省的水力侵蚀强度进行分级和面积统计,并与抽样调查结果进行对比。结果显示:全省各土壤侵蚀因子的估算结果与抽样调查结果较为接近;土壤水蚀以微度和轻度侵蚀为主,每年全省约85%的土地处于微度侵蚀(1 000 t/km~2),而强度侵蚀(5 000 t/km~2)面积仅占2%;抽样调查得到的独立工矿用地、果园、旱地和其他土地的侵蚀模数较估算得出的侵蚀模数大,而在草地、其他林地等土地利用类型上抽样调查得到的侵蚀模数却较估算得出的侵蚀模数小,主要原因可能是省域和抽样单元计算地形因子的DEM数据精度不同。总体上,该研究为如何利用抽样调查数据估算全国土壤侵蚀状况提供参考。
[Abstract]:The estimation of regional soil erosion is the key and difficult point of soil erosion investigation. In order to quantitatively estimate the regional soil erosion by using the sample survey data, the hydraulic erosion sampling survey data of the first national water conservancy census in 2011 are taken as the basis. The erosion factors and erosion amount of Liaoning Province in 2011, such as rainfall erosivity, soil erodibility, topography, soil and water conservation measures, were estimated by using the soil erosion equation of China (CSLEE) and geographic information system (GIS). On this basis, the hydraulic erosion intensity in the province was classified and area statistics were carried out, and the results were compared with the sample survey results. The results showed that the estimated results of soil erosion factors in the province were close to those of the sampling survey, and the soil water erosion was mainly slight and mild erosion. Every year, about 85% of the land in the whole province is in the area of 1 000 t / km-1 / kg, while the area of intensity erosion is only 2%. The erosion modulus of independent industrial and mining land, orchards, drylands and other lands obtained from sampling survey is larger than the estimated erosion modulus, but in grassland, The erosion modulus obtained from the sampling survey of other land use types is smaller than the estimated erosion modulus, which may be due to the difference in Dem data accuracy between the provincial area and the sampling unit in the calculation of topographic factors. In general, the study provides a reference for the estimation of soil erosion in China using sample survey data.
【作者单位】：辽宁省水利水电科学院;北京林业大学水土保持学院;
【分类号】：S157.1

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