空气动力学地表粗糙度样本容量的研究  

Research on the sample size for aerodynamic surface roughness

作　　者：张继宗[1,2] 张立峰[1,2] 刘玉华[1,2] 窦铁岭[1,2] 李彦雷[1] 

机构地区：[1]河北农业大学农学院,保定071001 [2]农业部张北农业资源与生态环境重点野外观测试验站,张家口076450

出　　处：《干旱区资源与环境》2014年第4期114-117,共4页Journal of Arid Land Resources and Environment

基　　金：国家"十一五"科技支撑计划项目(2006BAD15B05);河北省"十一五"科技支撑计划项目(06220901D)资助

摘　　要：借助风速数据自动采集系统获取的资料,计算了冀西北半干旱风沙生态类型区9种下垫面的空气动力学地表粗糙度,并从统计学角度分析了其变异特性和在一定精度要求下粗糙度与样本容量估计值的关系。结果表明:不同下垫面粗糙度差异显著,这与作物残茬、耕作类型等密切相关;地表粗糙度愈小,变异系数愈高,在同一给定相对精度下样本容量估计值越大,粗糙度与样本容量呈对数型负相关;同一下垫面相对精度要求越高,样本容量估计值越大。在划分粗糙度等级并给出相应的相对精度基础上,提出兼顾操作性与监测精度要求的样本容量估计值为100组。Aerodynamic surface roughness lengthes on nine kinds of different underlaying surface in semiarid sanddrift area of northwest Hebei Province were calculated according to the data collected by automatic recording system,and the variation of aerodynamic surface roughness length and the relationship between surface roughness and sample size with the relative precision were analyzed. The results indicated that the surface roughness on different underlaying surface had significant differences,it was related to crop residue and tillage type; the surface roughness was smaller,the variation of it was greater,the sample size was greater in the same relative precision; the surface roughness had negative exponential relationship with sample size; the relative precision was greater in the same underlaying surface,sample size was greater; the sample size with one hundred groups was major,when the relative precision was given,according to the given surface roughness range.

关 键 词：地表粗糙度 下垫面 样本容量 精度 

分 类 号：S157.1[农业科学—土壤学] O213.9[农业科学—农业基础科学]