基于遥感与抽样单元调查的县域尺度水土流失推算方法  

Estimation Methods of Soil Erosion Based on Remote Sensing and Sampling Survey

作　　者：段倩 齐斐 罗梦琦 刘霞[1] 唐俊[1] 张春强[2] 吴镇宇 李想[1] 姚孝友[2] DUAN Qian;QI Fei;LUO Meng-qi;LIU Xia;TANG Jun;ZHANG Chun-qiang;WU Zhen-yu;LI Xiang;YAO Xiao-you(Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Key Laboratory of Soiland Water Conservation and EcologicalRestoration of Jiangsu Province,Nanjing 210037,China;Monitoring Center Station of Soil and Water Conservation,Huaihe River Commission,Ministry of Water Resources,Bengbu 233001,China)

机构地区：[1]南京林业大学南方现代林业协同创新中心,江苏省水土保持与生态修复重点实验室,江苏南京210037 [2]淮河水利委员会淮河流域水土保持监测中心站,安徽蚌埠233001

出　　处：《山东农业大学学报（自然科学版）》2020年第6期1063-1068,共6页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：水利部全国水土流失动态监测与公告项目(SBJ2018010);山东省省级重点区域水土流失动态监测项目(SWJ201801);江苏省高校“青蓝工程”项目(164010058)。

摘　　要：为进一步研究基于1%和4%抽样密度,采用不同水土流失推算方法对县域水土流失监测成果的影响,为全国水土流动态监测提供技术支撑,本文以沂蒙山区沂水县为例,采用遥感与抽样单元调查相结合的方法,分析不同抽样密度下直接外推法、插值外推法和全覆盖计算法对水土流失状况的影响,并进行差异性分析。结果表明:(1)在1%、4%抽样密度下,直接外推法、插值外推法水土流失面积比分别相差6.49%和7.69%,相对误差达15.87%和16.22%,而全覆盖计算法水土流失面积比相差0.88%,相对误差1.97%;(2)1%抽样密度下,直接外推法与插值外推法水土流失状况结果相近,但与全覆盖计算法结果有差异;4%抽样密度下,三种推算方法水土流失状况结果接近,但是水土流失空间分布有明显区别。因此,基于抽样单元的直接外推法和插值外推法受抽样密度影响较大,全覆盖计算法受抽样密度影响较小,建议采用1%抽样密度下的全覆盖计算法进行水土流失动态监测。Soil erosion is a general concern of the ecological environment in the world.As one of the most serious soil erosion countries,we has invested a lot of financial resources,material resources and human resources to manage the soil erosion.The investigation of soil erosion on a regular basis is of great significance to evaluate the effect of soil erosion control.In order to further explore the influence of different sampling densities and calculation methods on the soil erosion investigation and evaluation results at county scale,and to provide technical support for the typical county monitoring of national Key Control areas,this paper takes Yishui County of Yimeng Mountain as an example.By remote sensing and sampling survey,two sampling densities with 1%and 4%,and three extrapolation methods of direct extrapolation,Kriging extrapolation and full coverage calculation were adopted to analysis the influence of different sampling densities and extrapolation methods to soil erosion.1)Direct extrapolation and Kriging extrapolation methods were more affected by the sampling densities,and the discrepancy percentage of soil erosion area calculated by two methods were 6.49%and7.69%,and the relative error were 15.87%and 16.22%.But full coverage calculation method was less affected by the sampling density with the discrepancy percentage of soil erosion area was only 3.13%and the relative discrepancy was only 9.27%.2)Under 1%sampling density,direct extrapolation and Kriging extrapolation calculation results were similar,but they were different from full coverage calculation results.Under 4%sampling density,three kinds of calculation results were close to each other,but the spatial distribution of soil erosion was obvious difference.3)The investigation and evaluation of soil erosion in typical counties of the key control area is proposed by using the full coverage calculation method based on 1%sampling density.

关 键 词：中国土壤流失方程模型 抽样密度 推算方法 县域尺度 相对误差 

分 类 号：S157.1[农业科学—土壤学]