摘要
【目的】研究不同土地利用方式下土壤含水率对降水的响应及其时间稳定性,提高区域土地生产力、改善区域生态环境。【方法】在黄泛平原风沙区设置3种试验处理,分别为:耕作区(T1处理)、裸地区(T2处理)、自然恢复区(T3处理),在2016―2019年针对0~5、5~10cm土层深度的土壤含水率和当地降雨量进行动态监测,统计分析不同土地利用方式、不同土层土壤含水率动态变化以及对降水的响应,并采用相对差分法分析土壤含水率的时间稳定性。【结果】(1)整个监测期土壤含水率呈T3处理>T1处理>T2处理,0~5、5~10 cm土壤平均含水率差异显著(P<0.05),表现为土壤含水率随土层深度增加而增加;(2)不同土地利用方式的不同土层土壤含水率与降水量显著正相关(P<0.01),土壤含水率随降水量增加而增加,降水量越大,土壤含水率增加越明显,当累计降水量不足60 mm时,0~5 cm土壤含水率对降水的响应更为明显,而当累计降水量大于60 mm时,降水主要作用于5~10 cm土层;(3)不同土层土壤含水率的时间稳定性存在显著差异,T1、T2处理的0~5 cm土层土壤含水率相对差分的标准差(SDRD)、时间稳定性指数(ITS)相比5~10 cm土壤含水率较大,时间稳定性差,而T3处理的0~5 cm土壤水分SDRD和ITS相对较小,时间稳定性强。相同土层、不同土地利用方式土壤水分时间稳定性也存在显著差异,0~5 cm土壤水分时间稳定性:T3处理>T2处理>T1处理;5~10 cm土壤水分时间稳定性:T2处理>T1处理>T3处理。【结论】T3处理在土壤表层水分保持方面优于T1、T2处理。
【Objective】The study of the response of soil water content to precipitation and its time stability under different land use methods is of great significance to improving regional land productivity and improving the regional ecological environment.【Method】In this study,three experimental treatments were set up in the wind~sand area of the Yellow River floodplain,farming area(T1 treatment),bare area(T2 treatment),and natural restoration area(T3 treatment).In 2016—2019,the soil depth of 0~5 cm and 5~10 cm was used.Dynamic monitoring of water content and local rainfall,statistical analysis of different land use methods,dynamic changes of soil water content of different soil layers and response to precipitation,and relative difference method to analyze the time stability of soil water content.【Result】(1)The soil water content during the monitoring period showed:T3 treatment>T1 treatment>T2 treatment,and the average soil moisture content of 0~5 cm and 5~10 cm had significant differences(P<0.05),and the soil moisture content varied with the soil;(2)There is a significant positive correlation between the soil water content of different soil layers and precipitation under different land use methods(P<0.01).The soil water content increases with the increase in precipitation.The greater the precipitation,the more significant the increase in soil water content.When the precipitation is less than 60 mm,the soil water content of 0~5 cm responds more significantly to the precipitation,and when the accumulated precipitation is greater than 60 mm,the precipitation mainly acts on the 5~10 cm soil layer;(3)There are significant differences in the time stability of different soil layers.The standard deviation(SDRD)and time stability index(ITS)of the relative difference of soil water content of 0~5 cm soil layer of T1 treatment and T2 treatment are larger than 5~10 cm,and the time stability is poor,while that of 0~5 cm soil of T3 treatment are relatively small,and the time stability is strong.There are also significant differences in the temporal stability of soil moisture between the same soil layer and different land use modes.The temporal stability of soil moisture in 0~5 cm:T3 treatment>T2 treatment>T1 treatment;the temporal stability of soil moisture in 5~10 cm:T2 treatment>T1 treatment>T3 treatment.【Conclusion】T3 treatment is significantly better than T1 treatment and T2 treatment in terms of soil surface water retention.
作者
赵磊
曹文华
李鑫浩
张渤研
张传杰
ZHAO Lei;CAO Wenhua;LI Xinhao;ZHANG Boyan;ZHANG Chuanjie(Shandong Agricultural University,Tai’an 271018,China;Mortoring Center of Soil and Water Conservation,Beijing 100053,China)
出处
《灌溉排水学报》
CSCD
北大核心
2021年第S01期94-101,共8页
Journal of Irrigation and Drainage
基金
山东省自然科学基金面上项目(ZR2020MD023)
关键词
土壤含水率
降水
时间稳定性
土地利用方式
黄泛平原风沙区
soil water content
precipitation
temporal stability
land use patterns
the sandy area of the Yellow River flood plain
