摘要
利用RS、GIS等遥感技术对2009年陕北吴起县SPOT多光谱波段遥感影像进行目视解译,获取全县及4%抽样比例的土地利用、坡度及坡长因子等土壤侵蚀因子调查精度,结合2009年以1%、0.25%、0.062 5%抽样比例实地调查的数据,分析不同抽样比例下土壤侵蚀因子的精度损失。结果表明:1)4%、1%抽样比例与全县相比,土地利用类型分布相似度均达到95%以上,0.25%和0.062 5%抽样比例下精度损失率最大达到-19.49%、-10.03%;2)4%和1%抽样比例下,与全县坡度分布相似度均达到99%以上,0.25%和0.062 5%抽样比例下精度损失率最高达-4.42%;3)4种抽样比例下与全县坡长因子分布相似度均在95%以上。总之,吴起县按照1%的抽样比例调查土壤侵蚀因子既能保证调查精度又能减少工作量。
The degree of survey precision of soil erosion factors is important for the estimation of the amount of soil loss.Taking Wuqi County in Shaanxi as research object,a new soil erosion survey method was proposed.Different sampling ratios were adopted,such as 4%,1%,0.25% and 0.062 5%.According to the visual interpretation of SPOT images of Wuqi County with RS and GIS remote sensing technologies,and the data of field survey by 1% uniform sampling ratio in 2009,land use types were classified and the survey precisions of soil erosion factors by different sampling ratios were compared.The results showed that： the similarity of distribution of land use types was greater than 95% between the data of the whole county and those of 4% and 1% sampling ratios,but the maximum loss rates of 0.25% and 0.062 5%sampling ratios were-19.49% and-10.03%,respectively;the similarity of distribution of slope reached 99% under the sampling ratios of 4% and 1% in the whole county,however,the maximum loss rate of 0.25% and 0.062 5% sampling ratios was-4.42%;the similarity of the slope length factor distribution was more than 95% with four sampling ratios.It was concluded that 1% sampling ratio in the survey of soil erosion factors was reliable,which could meet the survey precision with minimum workload.
出处
《西北林学院学报》
CSCD
北大核心
2013年第3期168-171,共4页
Journal of Northwest Forestry University
基金
"十二.五"国家科技支撑计划项目(2011BAD38B0601)
关键词
土壤侵蚀
抽样比例
精度
soil erosion
sampling ratio
precision
作者简介
赵维军，男，在读博士，研究方向：生态恢复。E—mail：zwj_0920@126．com
通信作者：朱清科，男，教授，博士生导师，研究方向：生态恢复与复合农林系统。E—mail：zhuqingke@sohu．com
