摘要
为了揭示极端干旱区土壤水分蒸发与土壤质地、灌溉水水量水质的关系,为防护林节水灌溉以及优化灌溉制度提供支持,在塔克拉玛干沙漠腹地进行了人工模拟蒸发实验,研究结果表明:土壤质地、灌溉水水量水质对土壤水分蒸发起到关键作用,相对于壤土及沙壤土,沙质土壤其土壤水分累积蒸发量较大,保水涵水能力弱;在灌溉水水量充足亦即充分供水条件下的土壤水分其累积蒸发量随时间呈线性变化,而非充分供水条件下为对数变化;同时土壤水分累积蒸发量随着灌溉水水量的增加而变大,各个处理的土壤水分累积蒸发量随着时间递增呈对数变化趋势;在一定范围内土壤水分累积蒸发量与灌溉水水质呈负相关,即灌溉水矿化度越高土壤水分累积蒸发量越小。
In order to reveal the relationship between soil moisture evaporation and soil texture and quantity and quality of irrigation water in extreme drought desert, and support the water-saving irrigation of protection forest and the irrigation system optimization, the artificial simulation evaporation experiments in the hinterland of the Taklimakan Desert was conducted. The results show that： soil physieo-chemical properties including soil texture and soil moisture content and status of irrigation water salinity played a key role in soil evaporation. Comparing to loam and sandy loam soil, the sandy soil had higher cumulative evaporation and lower water retention and conservation capacity. In the condition of sufficient irrigation （sufficient supply of water）, the cumulative evaporation changed in linear manner with time. However, as for non-sufficient water supply, it changed in logarithmic manner. The accumulated soil moisture evaporation was positively correlated with the initial moisture content, and the soil cumulative evaporation in each treatment increased in logarithmic manner with time. In some cases, the soil cumulative evaporation was negatively correlated with the irrigation water salinity, namely the higher irrigation water salinity leading to lower soil cumulative evaporation.
出处
《土壤通报》
CAS
CSCD
北大核心
2009年第6期1245-1249,共5页
Chinese Journal of Soil Science
基金
中国科学院重要方向项目(kzcx3-sw-342)
国家科技攻关计划西部开发行动项目(2005BA901A21)
中国科学院"西部之光"人才培养计划项目(20052118)
中国科学院新疆生态与地理研究所绿洲学者"博士人才"计划项目资助
关键词
塔克拉玛干
土壤质地
灌溉水水量
灌溉水水质
土壤蒸发
Taklimakan Desert
Soil texture
Irrigation water quantity
Irrigation water quality
Soil evaporation
