干旱区生态环境知识资源中心(Arid): 不同覆盖模式下砂壤土水盐运移特征研究

Arid

	不同覆盖模式下砂壤土水盐运移特征研究
其他题名	Study on the Characteristics of Water and Salt Transport in Sandy Loam Soil under Different Mulching Models
	赵文举; 马宏; 范严伟; 豆品鑫; 郁文
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2016
卷号	30 期号:3 页码:331-336
中文摘要	地表蒸发引起土壤水分的散失是造成盐分表聚的重要原因之一,土壤表层进行覆盖可改变地表结构,从而影响土壤水分蒸发和盐分迁移过程。为了揭示不同覆盖模式的蓄水控盐效果,通过室内模拟试验,研究了不同覆盖模式下土壤水分入渗过程和水盐迁移特征。试验设置无覆盖(CK)、覆砂(S)、覆砂+覆膜(SM)、覆秸秆+覆膜(JM)和覆秸秆+覆砂(JS)5种模式。结果表明:土壤表层进行的不同覆盖处理会降低土壤湿润锋推进速率和水分入渗速率,具有一定的阻渗作用;湿润锋推进距离与时间符合幂函数F =a·t~b,累积入渗量与时间符合Kostiakov入渗公式,湿润锋推进距离与累积入渗量符合线性关系I=K· Z_f+c。土壤表层进行的不同覆盖处理可有效抑制土壤水分蒸发,土壤保水效果为SM>JS>S>JM>CK;随土层深度的增加,土壤含水率减小的趋势逐渐减缓。土壤表层进行的不同覆盖处理也可减弱土壤盐分表聚,缩小盐分在土壤中迁移的范围;覆盖处理的土壤盐分主要在020 cm范围内迁移,CK在035 cm范围内。综合考虑不同覆盖模式对土壤水分入渗、抑制水分蒸发和减弱盐分表聚效果,认为砂石覆盖模式是较适合西北旱区的覆盖模式。
英文摘要	The loss caused by surface evaporation of soil moisture was one of the important reasons for the crop yield under gravel-sand mulching,gravel-sand mulching could change the surface structure,thus affecting the evaporation of soil water and water-salt movement.This paper studied the effect of mulching on soil water infiltration process and water and salt transport in soil through laboratory simulation experiments to reveal the effect of different mulching modes on water and salt effect.The test set up five modes including bare land(CK),sand mulching(S),sand and plastic film mulching(SM),straw and plastic film mulching(JM)and straw and sand mulching(JS).The result showed that the different mulching modes of soil surface could reduce the soil wetting front advance rate and water infiltration rate and infiltration with blocking the, wetting front advance distance and time accords with power function F=a·t~b,cumulative infiltration volume and time to conform to the Kostiakov formula,wetting front advance distance and cumulative infiltration conform to a linear relationship I=K·Z_f+c.The different mulching modes of soil surface could also inhibit effectively soil water evaporation,soil water retention effect was SM>JS>S>JM>CK.With the increase of soil depth,the soil moisture content decreased gradually.The different mulching modes of soil surface could also inhibit effectively top enrichment of soil salt,reduce the range of salt movement in the soil,and the soil salinity was mainly migrated in the range of 020 cm,and CK was in the range of 035 cm.Considering the effect of different mulching modes on soil water infiltration,inhibiting water evaporation and weakening the effect of salt accumulation,it was considered that the sand and gravel cover mode was more suitable for the arid regions of Northwest in China.
中文关键词	入渗 ; 湿润锋 ; 累积入渗量 ; 蒸发 ; 水盐运移
英文关键词	infiltration wetting front cumulative infiltration evaporation water and salt movement
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5718828
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234975
作者单位	兰州理工大学能源与动力工程学院, 兰州, 甘肃 730050, 中国
推荐引用方式 GB/T 7714	赵文举,马宏,范严伟,等. 不同覆盖模式下砂壤土水盐运移特征研究[J],2016,30(3):331-336.
APA	赵文举,马宏,范严伟,豆品鑫,&郁文.(2016).不同覆盖模式下砂壤土水盐运移特征研究.水土保持学报,30(3),331-336.
MLA	赵文举,et al."不同覆盖模式下砂壤土水盐运移特征研究".水土保持学报 30.3(2016):331-336.