ZHANG Fei,Tashpolat·Tiyip,DING Jian-li,et al.Application of Salt Distribution Chemical Field Theory in Soil Salination in Arid Oasis—A Case Study in the Delta Oasis Of Weigan and Kuqa Rivers[J].Research of Soil and Water Conservation,2008,15(04):88-93,97.
水土化学场理论在干旱区绿洲盐渍土研究中的应用——以渭干河-库车河三角洲绿洲为例
- Title:
- Application of Salt Distribution Chemical Field Theory in Soil Salination in Arid Oasis—A Case Study in the Delta Oasis Of Weigan and Kuqa Rivers
- 关键词:
- 渭干河-库车河三角洲绿洲; 盐渍化; 水土化学场; 变异函数
- Keywords:
- the delta oasis of Weigan and Kuqa rivers; salinization; salt distribution field in water-soil environment; variogram function
- 分类号:
- S156.4
- 摘要:
- 针对目前塔里木盆地北缘地区存在的土壤盐渍化问题，以新疆塔里木盆地北缘渭干河-库车河三角洲绿洲为例，根据水土环境中盐渍成分时空分异的区域化特征，应用盐渍水土化学场理论，建立变异函数模型定量化模拟其空间分异，求得变异函数后，采用Geostatistical Analyst地质统计分析模块中的Kriging插值方法定量化预测某种盐渍水土环境特征的空间分布，即对渭干河-库车河三角洲绿洲土壤特征（含盐量和电导率）的空间变异性进行分析。结果表明：渭-库绿洲表层土壤电导率和含盐量采用Exponential模型拟合效果比较好。电导率和含盐量的分维数为1.938和1.907，说明表层土壤含盐量的空间依赖性要比电导率的强，即引起表层土壤电导率空间变异中随机因素起决定性作用，而表层土壤含盐量则受结构性因素和随机因素共同作用。表层土壤电导率和含盐量的块金值与基台值之比分别为44.72%和38.61%，具有中等的空间相关性。并且变异系数分别为0.634和0.618。故具有中等变异强度，主要原因在于表层干扰因素较多（大气降水、灌溉、植被覆盖、蒸散发、根系吸水及地表微地形的差异等）。利用在渭干河-库车河三角洲绿洲的实测数据进行验证，可为盐渍水土环境的定量化研究提供理论依据。
- Abstract:
- In this paper,author has proposed the delta oasis of Weigan and Kuqa rivers which are located in the North of Tarim Basin considered as the typical area. According to regional distribution characteristics of salt in water-soil environment,the theories of Salt Distribution Field in water-soil Environment are applied. Variation function offered is used to model quantitatively space differentiation of salt in water-soil environment,thus,the Geostatistics is used in soil science to explore its spatial distribution characteristics and its variability law,which has been advocated by more and more experts. The fundamental of geostatistics and its utilization in soil spatial variability on soil physical characteristics,soil conductivity and salt content were reviewed in this paper. Geostatistics combined with GIS was applied to analyze the spatial variability of soil conductivity and salt content in topsoil in the delta oasis of Weigan-Kuqa rivers. In this paper,the research which was based on Kriging method,was handled by ArcGIS. GIS can integrate attribute data with geographical data of system variables,which makes the application of geostatistics technique for large spatial scale more convenient. It is showed that the spatial correlation of topsoil conductivity and salt content at this large scale were strongly dependent,the proportion of Nugget and Sill is 44.72% and 38.61%. Variance coefficient is 0.634 and 0.618. Then choosing proper Kriging model,verifying of the Cross-Validation and correcting the parameters are important factors influencing accurate analysis. At last,this method is applied by integrating experimental data in saline soil of the delta oasis of Weigan and Kuqa rivers,and get EC,salt content sample in saline badlands,at the same time,get different direction EC,salt content sample variance. This theories can be used quantificationally study on saline and alkaline water-soil environment.
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备注/Memo
收稿日期:2007-12-18。
基金项目:自治区高校科研计划项目（XJEDU2004I06）；教育厅创新研究群体基金项目（XJEDU2004G04）；中科院西部之光项目（XJEDU2005I07）；新疆绿洲生态重点实验室开放课题（XJDX0201-2007-01）；（XJDX0201-2008-03）；新疆大学青年教师科研启动基金（QN070122）资助
作者简介:张飞（1980- ），男，陕西省凤翔县人，硕士，主要从事干旱区资源与遥感应用研究。E-mail：zhangfei3s@yahoo.com.cn