摘要
对目前常用的区域土壤侵蚀研究方法分析表明,区域尺度土壤侵蚀方法主要包括区域观测法、观测站点代表法、站点资料函数推广法和泥沙输移比转换法等4种。而区域观测法又可分为河流泥沙观测法、地貌研究法和土壤学方法;观测站点代表法包括密集站点观测法和单点资料扩展法、地理格网法和综合因子法等单元划分站点代表法等。对不同研究方法的数据特点、对机理或理论的依赖性和评价精度等的讨论表明,研究数据采集尺度越小,数据的精度就会越高,在土壤侵蚀研究时对机理等依赖性就越强;如果采集的站点和数据较多,或者对有限数据在扩展时所依据的机理把握较好,模拟的精度就越高,更能客观映区域土壤侵蚀状况。
The methods of soil erosion research at regional scale are sorted out and analyzed. Regional measurement method, observation stations data using directly, data expansion by equation and converting by sediment delivery ratio are four common kinds of method of soil erosion research at regional scale. Regional measurement method includes sediment measurement of rivers, geomorphologic analysis and pedological analysis. Observation stations data using directly includes two kinds of methods by measuring numerous stations and measuring selected stations based on natural units, geographical grids and integrated units. The characteristics of data, the dependence on theory, and estimation precision are discussed in brief. It showed that the smaller the scale chosen, the more precise the data and the more dependences on theories. If more stations measured and better expansion methods were depended on, the modeling precision would be better.
出处
《西北林学院学报》
CSCD
北大核心
2003年第4期74-78,83,共6页
Journal of Northwest Forestry University
基金
中国科学院知识创新方向项目"黄土高原水土保持的区域环境效应研究"(KZCX3-SW-421)
中国科学院水利部水土保持研究所领域前沿科研专项"区域运输设施建设新增水土流失定量评价方法"
关键词
土壤侵蚀
区域
尺度
方法
soil erosion
region
scale
method
