砾石覆盖度测量方法研究  

A Study on Measurement Methods of Rock Fragment Cover

作　　者：高杨[1,2] 符素华[1,2] 罗来军[1,2] 王楠[1,2] 朱旭[1,2] 

机构地区：[1]地表过程与资源生态国家重点实验室,北京100875 [2]北京师范大学地理学与遥感科学学院,北京100875

出　　处：《水土保持通报》2013年第4期264-267,270,共5页Bulletin of Soil and Water Conservation

基　　金：中央高校基本科研业务费专项资金;国家自然科学基金项目(40201031);长江学者和创新团队发展计划

摘　　要：地表砾石是各种水文和侵蚀等过程综合作用的产物，是土壤退化和生态系统恶化的一个标志；反过来这些砾石也影响到侵蚀的各个过程。分别利用视点框架法和照相法对不同粒径样本下（2～6mm，6～20mm，20～60ram）的砾石覆盖度进行了测量，对比分析了不同砾石覆盖度测量方法对其精度的影响。结果表明，采用两种测量方法观测砾石覆盖度均能达到一定精度，视点框架法测量的砾石覆盖度相对误差变化范围为-7．84％～80．86％，平均相对误差为15．69％，照相法测量的砾石覆盖度相对误差变化范围为-48．35％～9．89％，平均相对误差为-11.69％。随着砾石覆盖度的增加，视点框架法测量的相对误差绝对值表现为减小。视点框架法测量的最大相对误差均值的绝对值随着抽样次数的增加而减少，当抽样次数达到约30，相对误差减小的趋势减缓。Abstraet： As a result of the hydrologic and erosion processes, rock fragment is a sign of soil and ecosystems degradation, which in turn affects erosion processes. The purpose of this study is to investigate the precision differences between sampling and photographic methods in rock fragment covers measurements. To do this, rock fragment covers with different particle sizes（2~6 mm, 6~20 mm and 20~60 mm） were measured by these two methods. The results showed that both sampling and photographic methods can be used to meas- ure the rock fragment cover effectively. The relative errors measured by two methods varied by--7.84~ 80.86~ and --48.35~//0~9. 890/00, respectively. The mean relative error of these two methods was 15.69~//oo and --11.69~, respectively. The relative error measured by sampling method decreased with the increasing of rock fragment cover. The maximum absolute relative error measured by sampling method reduced with the number of sampling, but this trend became gentle when the number of sampling was up to about 30. Keywords： rock fragment cover; photographic method; sampling method

关 键 词：砾石覆盖度 照相法 视点框架取样法 

分 类 号：S157.1[农业科学—土壤学] TU113.21[农业科学—农业基础科学]