北京林业大学学报2016，Vol.38Issue(11)：9-15,7.DOI:10.13332/j.1000-1522.20150515
拉萨半干旱河谷宜林地土壤水分时空分布格局
Distribution pattern of soil moisture space-time of forestland in semi-arid valley of Lhasa, southwestern China
摘要
Abstract
Soil moisture is one of the main limiting factors of vegetation restoration. As the research objects of seven typical site types which belong to the layers of 0--20 cm, 20--40 cm, 40--60 cm depth soil, the paper studies the change and pattern of space-time distribution of soil moisture in semi-arid valley of Lhasa, southwestern China. The results showed that the soil moisture changing trends of different site types were roughly same and the shape was unimodal distribution. The minimum and maximum water content occurred in January and August respectively, and its range was between 2. 43%--30. 03%. The order of soil water content from high to low was as follows:high water level of flood land > upper part of shady slope>lower part of shady slope> low water level of flood land> upper part of sunny slope >terrace> lower part of sunny slope. The time spatial pattern of soil moisture could be divided into three periods, ie soil water accumulation period ( from June to September ) , soil water consumption period ( from October to the January of next year) and soil water stationary period( from February to May) . The space distribution of soil moisture could be divided into three layers, ie soil water comported layer (0--20 cm) , soil water active layer ( 20--40 cm ) and soil water relatively stable layer ( 40--60 cm ) . This conclusion has a certain guiding significance for the vegetation construction in this area.关键词
拉萨/半干旱河谷/土壤水分/分布格局Key words
Lhasa/semi-arid valley/soil moisture/distribution pattern分类
农业科技引用本文复制引用
邱邦桂,李永霞,杨小林,马和平..拉萨半干旱河谷宜林地土壤水分时空分布格局[J].北京林业大学学报,2016,38(11):9-15,7.基金项目
“十二五”国家科技支撑计划项目(2013BAC04B01)、国家自然科学基金项目(31460192)。 （2013BAC04B01）
