沙坡头人工固沙植被土壤水分空间异质性

应用生态学报

沙坡头人工固沙植被土壤水分空间异质性

马风云¹;李新荣²;张景光²;李爱霞²

¹山东农业大学林学院，泰安 271018；²中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站，兰州 730000

收稿日期:2005-04-30 修回日期:2006-02-21 出版日期:2006-05-18 发布日期:2006-05-18

Spatial heterogeneity of soil moisture in Shapotou sand-fixing artificial vegetation area

MA Fengyun¹;LI Xinrong²;ZHANG Jingguang²;LI Aixia²

¹College of Forestry,Shanddong Agricultural University,Taian 271018,China;
²Shapotou Desert Research and Experiment Station,Cold and Arid Region Environment and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China

Received:2005-04-30 Revised:2006-02-21 Online:2006-05-18 Published:2006-05-18

摘要/Abstract

摘要： 利用传统统计学和地统计学相结合的方法对沙坡头人工固沙植被区0～200 cm 之间的各层土壤水分的空间变异性进行研究.结果表明，1）土壤水分相对变异较大的层是在160～180 cm层和180～200 cm层，变异系数分别为0.72和0.73.表层0～5 cm层的相对变异也较大，变异系数为0.662）半方差函数分析结果表明，各层土壤水分均具有明显的空间变异性，各层土壤水分自相关部分的空间异质性占总空间异质性的程度很高，所占比例在87.7%～99.9%范围内.各层土壤水分的有效变程大小有较大差异，最小值出现在60～80 cm层(7.04 m)，最大值出现在20～40 cm层(19.71 m)，土壤水分有效变程从表层到深层没有明显的变化规律；3）土壤水分插值图反映出0～140 cm之间相邻各层土壤水分变化较大，140～200 cm各层土壤水分变化较小；4）土壤水分在0°、45°、90°、135°四个方向的半方差函数基本上是一条直线，表明在这四个方向上半方差和距离的相关性较低，土壤水分变化是独立、随机的，是同质性的.

关键词: 卤代烷烃脱卤酶基因, 拟南芥, 反式失活, 转录后沉默

Abstract: To explore the characteristics of soil moisture heterogeneity in sand-fixing artificial vegetation area is of significance in vegetation recovery and environment control in arid regions.With the methods of traditional statistics and geo-statistics,this paper studied the heterogeneity of soil moisture in the layers from 0 to 200 cm in depth in Shapotou sand-fixing vegetation area.The results showed that the variation of soil moisture in layers of 160～180 and 180～200 cm was relatively larger,with the variation coefficient being 072 and 0.73,respectively,and the next was in top layer (0～5 cm ),with a variation coefficient of 0.66.Semi-variance analysis showed that the autocorrelation of soil moisture spatial heterogeneity in total spatial heterogeneity was high,ranging from 87.7% to 99.9%.The scale of spatial heterogeneity in different soil layers was different,with the minimum in 60～80 cm layer and the maximum in 20～40 cm layer,but no regular changes being observed from surface to deep layers.The colorful contour maps of Kriging interpolation indicated that the variation of soil moisture was larger in 0 ～140 cm layer than in 140～200 cm layer.The correlation between semi-variance and distance in four directions of 0°,45°,90° and 135° was weak, suggesting that the variation of soil moisture was independent, random, and homogeneous.

Key words: Haloalkane dehalogenase gene (dhlA), A rabidopsis thaliana, Trans-inactivation, Post-transcriptional silencing

马风云¹;李新荣²;张景光²;李爱霞². 沙坡头人工固沙植被土壤水分空间异质性[J]. 应用生态学报.

MA Fengyun¹;LI Xinrong²;ZHANG Jingguang²;LI Aixia² . Spatial heterogeneity of soil moisture in Shapotou sand-fixing artificial vegetation area[J]. Chinese Journal of Applied Ecology.

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