溶质势对地表蒸发速率的影响

被引：10

作者：

彭振阳 ^{[1
]}

郭会 ^{[1
,2
]}

伍靖伟 ^{[1
]}

黄介生 ^{[1
]}

阿布都艾尼 ^{[1
]}

机构：

[1] 武汉大学水资源与水电工程科学国家重点实验室

[2] 长江水利委员会长江勘测规划设计院

来源：

水科学进展 | 2013年 / 24卷 / 02期

关键词：

盐分; 溶质势; 地表蒸发; 蒸发速率;

D O I：

10.14042/j.cnki.32.1309.2013.02.008

中图分类号：

S152.7 [土壤水分];

学科分类号：

0903 ; 090301 ;

摘要：

针对盐碱化土壤地表蒸发速率研究的不足,以表层土壤为研究对象,采用土壤蒸发试验和数学模型相结合的方法分析了溶质势对地表蒸发速率的影响。结果表明:当土壤中盐分没有沉淀结晶时,溶质势是盐分引起地表蒸发速率降低的主要原因;溶质势越低,蒸发速率下降比例越大,该下降比例与溶质势有近似线性关系,但同时还受到空气温度与相对湿度、土壤温度以及土壤基质势等因素的影响;当表层土壤存在水盐补给时,地表蒸发速率总是变化趋向于水分补给速率,但含盐土壤蒸发速率变化较慢,而且若补给水分中含盐,那么其稳定蒸发速率会低于水分补给速率。

引用

页码：235 / 242

页数：8

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