摘要
土壤侵蚀评估预测是水土保持的重要基础.传统土壤侵蚀评估模型通用性较差,不能有效解决尺度转化的问题,而且对输入数据要求较高.本文通过引入快速评估的思想,基于遥感监测数据和最小图斑,建立了土壤侵蚀快速评估模型.模型通过层次分析法得到了土壤侵蚀特征指标(EI),用以表征图斑内的土壤侵蚀特征.评估的主要步骤包括:环境因子选择,数据完备区EI计算,数据缺乏区EI计算,数据空白区EI计算,EI与土壤侵蚀强度(E)之间关系的判别分析,以及土壤侵蚀强度评估结果的分级显示.该评估方法具有快速、高效、实用的特点,且能利用已有的资料合理处理数据缺乏和空白区的评估,提高了数据利用效率和模型评估效率,能够更好地服务于水土保持工作.
Soil erosion assessment and prediction is of great significance to soil and water conservation. In view of the limitations of the traditional models in applications in different temporal and spatial scales ,this paper presents a rapid soil erosion assessment approach based on minimum polygons. A soil erosion characteristic the Analytic Hierarchy Process （AHP）. The environmental factors, calculation E1 respectively in data are scarce, and where all data are E, assessment E according to E1 through index EI is proposed and calculated using assessment process entails selection of regions where all data are available, where unavailable, construction discriminants between EI and the discriminants, and display the assessment results in ArcView. The approach is efficient and can properly deal with data scarcity, which make it much more convenient in applications.
出处
《应用基础与工程科学学报》
EI
CSCD
2007年第4期425-434,共10页
Journal of Basic Science and Engineering
基金
国家自然科学基金委资助项目(50579001)
关键词
土壤侵蚀
特征指标
快速评估
最小图斑
soil erosion
characteristic index
rapid assessment
minimum polygon
