| 农田土壤水分和盐分的空间变异性及其协同克立格估值 |
| |
| 引用本文： | 胡克林,李保国,陈德立,R.E.White.农田土壤水分和盐分的空间变异性及其协同克立格估值[J].水科学进展,2001,12(4):460-466. |
| |
| 作者姓名： | 胡克林 李保国 陈德立 R.E.White |
| |
| 作者单位： | 1.中国农业大学土壤和水科学系, 北京, 100094; |
| |
| 基金项目： | 中澳合作ACIAR项目(LWRl/96/164);国家"九五"科技攻关项目(96-004-01-14-2). |
| |
| 摘 要： | 通过对一块面积为1hm2麦田内的98个观测点取样分析,测定了两个时期的土壤水分和盐分含量。结果表明两个时期的土壤含水量均服从正态分布,底层盐分均服从对数正态分布,而表层的盐分分布具有不确定性。两个时期土壤水分和盐分的变异系数分别属于弱变异和中等变异强度。通过结构分析,发现两个时期的水分和盐分均在一定范围内存在空间相关性。对两个时期土壤水分和盐分空间分布的动态变化进行了比较,同时采用CoKriging方法进行估值,与Kriging法相比,其估计方差减少百分数最大达到了136.3%。
|
| 关 键 词： | 土壤水分 土壤盐分 空间变异 半方差函数 协同克立格法 |
| 文章编号： | 1001-6791(2001)04-0460-07 |
| 收稿时间： | 2000-08-21 |
| 修稿时间： | 2000年8月21日 |
Spatial Variability of Soil Water and Salt in Field and their Estimations by the
CoKriging |
| |
| R.E.White.Spatial Variability of Soil Water and Salt in Field and their Estimations by the
CoKriging[J].Advances in Water Science,2001,12(4):460-466. |
| |
| Authors: | REWhite |
| |
| Affiliation: | 1.Department of Soil and Water Sciences, China Agricultural University, Beijing 100094, China;2.Institute of Land and Food Resources, Melburne University, Parkville Victoria 3052 Australia |
| |
| Abstract: | The soils at ninety-eight observing points by a square of 10×10(m2)were sampled in a wheat field (approximately 1 ha).The mil water and salt of each point in the layers of 0-20cm and 80-100cm were measured at different time.The results indicated that the soil water content under two layers at different time showed a normal distribution,the soil salt content in bottom soil showed a lognormal distribution and the soil salt content in surface soil showed an uncertain distribution.The variability coefficients of soil water and salt respectively belonged to the low and middle intensity.The semivariance analysis was used and found that the mil water and salt were correlated in a given spatial range.Preliminary analysis was made for the spatial dynamic variability of soil water and salt in different time.The Co Kriging method was alms used to estimate soil water and salt content,the estimated variance could be decreased by 136.3% comparing with ordinary Kriging. |
| |
| Keywords: | soil water soil salt spatial variability semivariance CoKriging |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
|
点击此处可从《水科学进展》下载全文 |
