摘要
通过对 16m× 16m田块 2 89个土壤剖面的取样分析 ,测定土壤水分、pH、盐分、电导率。结果表明 ,土壤含水量均服从非正态分布 ;盐分的分布类型除 6 0～ 80cm呈非正态分布外 ,其它各层均服从正态分布。土壤水分和盐分的变异系数均呈中等变异强度。通过结构分析 ,发现土壤水分和盐分在一定范围内存在空间相关性。对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 12 1.4 8% ,117.83%。
Soil properties (physical, chemical and biological properties) have the temporal and spatial variability, which increase the difficulty of researching the laws of soil water and salt movement. The spatial distribution of a certain property of soil is often closely related to other properties. This paper analyzes the soil samples sampled from 289 profiles in an area of 16 m×16 m and in depths of 0～20 cm and 80～100 cm in field of Tamari ramosissima Ldb., and the soil moisture content, salt content, pH values and electrical conductivity are measured. The results show that the soil moisture content at each layer at the different time is in a lognormal distribution, soil salt content is in a normal distribution except it is in a lognormal distribution at depth of 60～80 cm. The variability coefficients of soil moisture content and salt content are in the middle intensity. The results of semi-variance analysis reveal that the soil moisture content and salt content are correlated in a certain spatial range. A preliminary analysis is carried out for the spatial dynamic variability of soil moisture content and salt content at the different time. The CoKriging method is also used to estimate the soil moisture content and salt content, the estimated variance can be decreased for 121.48% comparing with that estimated by the ordinary Kriging method.
出处
《干旱区研究》
CSCD
2003年第4期252-256,共5页
Arid Zone Research
基金
国家自然科学基金 ( 4 0 0 710 0 9)
国家 (G199943 5 -0 6)课题资助
中科院创新项目 (KZCX3 -SW -3 2 6/3 2 7)
