%0 Journal Article
%T SPATIAL STRUCTURE OF SOIL WATER CONTENT AND SAMPLING NUMBER DETERMINATION IN THE FIELD<br>田间土壤含水率的空间结构及取样数目确定
%A Yang Shixiu
%A Lei Zhidong
%A <br>杨诗秀
%A 雷志栋
%J 地理学报
%D 1993
%I 
%X This paper deals with spatial variation and spatial structure of soil-water content based on the test data in the field. 100 sampling sites were arranged along a line with one meter interval located at the Experimental Station of Guan County in Shandong Province. 505 samples were taken at depths of 10cm,30cm, 50cm,70cm,90cm ,89 samples for bulk density were taken in correspondence with the samples for soil-water content. The analysis of statistical parameter, autocorrelation, and semivariogram have been done for the soil-water contents at different depths the avarage 0-100cm soil-water content. Field data obtained form the study area show that the coefficient of soil-water content CVs is about 0. 1- 0. 25. The values are similar to the CVs from 78 series (5000 samples), which we were taken form Shanxi, Inner Mongolia, and Hebei Provences. The coefficient of avarage soil-water content CV at 0-1 00cm is smaller than that of the soil-water content CVs at different depths. It is possible to calculate soil-water storage capacity for one meter depth by using average soil-water content and average bulk density. The spatial relationship among the field soil-water contents is of little Significance. Samples which have a certain distance can be treated as random variables. Then the number of samples necessary for various probability level (or confidence level) Pl and specified limit (or certain estimation error) A Can be determined. A method of computer-similitude have been applied to check the necessary number of samples otained form the table. In general,sampling for soil-water content with specified limit of A=10-15% at confidence level of Pl=90-95% is acceptable in practic.
%K Soil Water Content
%K Spatial structure
%K Sampling number<br>土壤
%K 含水率
%K 空间结构
%K 取样数目
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=869B153A4C6B5B85&jid=F7B5B947C24B9D649491012214E4BEF4&aid=24CDCE935D373F69&yid=D418FDC97F7C2EBA&vid=B6DA1AC076E37400&iid=94C357A881DFC066&sid=C66DE7562B0326E2&eid=522844664D9E629A&journal_id=0375-5444&journal_name=地理学报&referenced_num=14&reference_num=1