宁夏盐池沙地不同密度人工柠条林土壤水分时空变化分析  

The temporal and spatial changes of soil moisture in different density of Caragana korshinskii in sandy land of Yanchi,Ningxia

作　　者：舒维花[1,2] 蒋齐[2] 王占军[2] 何建龙[2] 

机构地区：[1]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [2]宁夏农林科学院荒漠化治理研究所,银川750002

出　　处：《干旱区资源与环境》2012年第12期172-176,共5页Journal of Arid Land Resources and Environment

基　　金：宁夏科技攻关课题(KGX-11-09-03);宁夏区自然基金(NZ1184);宁夏区自然基金(NZ1174)资助

摘　　要：对宁夏盐池退化沙地不同密度的人工柠条林地的土壤水分时空特征进行分析。结果表明:1)林下土壤体积含水量随着深度的增加呈先增大后降低的趋势,在垂直剖面上可分为土壤水分速变层(0-20cm)、活跃层(20-80cm)、相对稳定层(80-100cm);2)土壤水分季节动态变化可划分为:积累期(4-5月);消耗期(6-9月);稳定期(10月至次年4月)3个时期;3)土壤体积含水量随人工林密度增加呈下降趋势,2490丛/hm2和1665丛/hm2可作为该区人工柠条林调控密度的参考依据。The temporal and spatial features of soil moisture of the Caragana korshinskii shrubs were analyzed.The results showed that：（1）The soil volumetric moisture in the different densities of the Caragana korshinskii shrubs changed as the soil depth changed,and the surface soil moisture was the lowest.With the increase of the soil depth,the soil moisture firstly increased and then decreased,and the variation coefficient of soil moisture gradually decreased.The vertical distribution of the soil moisture could be divided into three layers： variable speed-layer,active-layer and relatively stable-layer.（2）There were three stages for the seasonal changes of soil moisture： the accumulation stage（from April to May）,the consumption stage（from June to September） and the stable stage（from October to next April）.（3）The soil moisture decreased with the increase of density of Caragana korshinskii shrubs,the 2490 strains/hm2and 1665 strains/hm2 can be considered as the reference criterion to control the stand density in this area.

关 键 词：柠条 密度 土壤水分 时空变化 

分 类 号：S152.7[农业科学—土壤学]