晋西黄土残塬沟壑区水分变化及其利用效率研究  

Research on Water Changes and Water Use Efficiency in Loess Gully Region in Western Shanxi Province

作　　者：胡振华[1] 王治国[1] 高宏旭 王利军[1] 

机构地区：[1]山西农业大学林学院,山西太谷030801 [2]大宁县林业局,山西大宁042300

出　　处：《山西农业大学学报》2001年第3期248-251,共4页

摘　　要：通过定位观测 ,分析了晋西黄土残塬沟壑区土壤水分动态、土壤供水与耗水关系及林木水分利用效率。结果表明 :由于严重的水土流失及坡向的影响 ,水分分布极为不均 ,不同部位水分变化规律的总趋势是 :沟底 >沟坡下部 >塬面 >塬坡 >沟坡中上部 ;幼林地土壤水分消耗大于供给 ,水分供需矛盾突出 ,雨季水分供给充足 ,土壤贮水增加 ;不同坡向水分亏损大小顺序为 :阳坡 >半阳坡 >阴坡 ;从水分利用效率看 ,由于幼林地水分供应不足 ,林木生长不同程度受到限制 。Based on theories and methods of hydrology, the main factors of water consumption and supply by on-site observation were obtained. Available water resource and regularity of water supply and consumption , the relationship between water supply and water consumption were analyzed. Due to severe soil and water erosion as well as different slope aspects, water distribution is extremely different. The trends of water dynamic changes in different locations are: the bottom of gully>the lower gully slope>terrace field>terrace slope>middle and upper slope; the amount of soil water consumption is bigger than that of soil water supply, serious water deficit always occurs. The law of water deficit in different slopes are: southward slope>westward slope>northward slope. because of water deficit, stand growth is limited differently, water use efficiency is relatively low.

关 键 词：水分动态 水分利用效率 水分供需 黄土 土壤水分 

分 类 号：S152.7[农业科学—土壤学] S155.24[农业科学—农业基础科学]