摘要
为探究不同种植年限对土壤水分入渗的影响,利用室内垂直一维土柱入渗试验分析了不同种植年限(2,5,10,20,30,40 a)压砂地土壤水分入渗速率、累积入渗量和湿润锋运移规律,借助4种入渗模型对土壤水分入渗过程进行拟合并评价其适用性,通过一维代数模型及相关参数预测土壤剖面含水率分布特征.结果表明:随种植年限增加,土壤累积入渗量、入渗速率及湿润锋运移距离均减小,入渗时间为300 min时,5,10,20,30,40 a的累积入渗量相较于2 a分别减少了27.01%,43.32%,53.22%,54.79%和54.68%,湿润锋运移距离减小了24.84%,38.38%,48.56%,52.67%和54.00%.4种入渗模型的R 2从大到小依次为Horton模型、通用经验模型、Kostiakov模型、Philip模型.入渗完成后同一深度土壤剖面含水率呈现出随种植年限增大而减小的趋势,一维代数模型拟合的不同种植年限土壤剖面含水率值与实测值间的MAE均为0.48%~2.09%,RMSE为0.52%~2.13%,D均大于0.782,t检验P值均大于0.05,说明其可以较好地拟合不同种植年限压砂地水分分布状况.压砂地种植年限越长,水分入渗能力越差、土壤剖面含水率越低,建议通过加强农田管理、休耕等措施实现压砂地可持续发展.
In order to explore the influence of gravel-mulched land with different planting years on soil water infiltration,the indoor vertical one-dimensional soil column infiltration test was used to analyze the gravel-mulched land with different planting years(2,5,10,20,30 and 40 a).Soil infiltration rate,cumulative infiltration volume and wetting front migration law were transformed into 4 infiltration models to fit the soil moisture infiltration process of gravel-mulched soil and evaluate its applicability,through a one-dimensional algebraic model and related parameters.The prediction results show that with the increase in sowing years,the cumulative soil infiltration amount,infiltration amount and the distance of the wet front movement are all significantly reduced.When the infiltration time is 300 min,compared with 2 years,the cumulative infiltration of 5,10,20,30 and 40 a decreases by 27.01%,43.32%,53.22%,54.79%and 54.68%,respectively,and the distance of wet front migration decreases by 24.84%,38.38%,48.56%,52.67%and 54.00%respectively.The R 2 sequence of the four infiltration models is:Horton model>common experienced model>Kostiakov model>Philip model.The MAE between the soil profile scale values of different planting years fitted by the dimensional algebra model and the measured values are all between 0.48%and 2.09%,the RMSE are between 0.52%and 2.13%,D are all greater than 0.782,and t(test P values)were greater than 0.05,showing that it can better fit the water distribution of gravel-mulched land with different planting years.The longer the planting period of gravel-mulched land,the worse the water infiltration capacity and the lower the soil profile moisture content.It is recommended that the sustainable development of gravel-mulched land should be realized through measures such as strengthening management and fallow.
作者
王幼奇
阮晓晗
白一茹
高小龙
WANG Youqi;RUAN Xiaohan;BAI Yiru;GAO Xiaolong(School of Geography and Planning,Ningxia University,Yinchuan,Ningxia 750021,China;School of Ecology Environment,Ningxia University,Yinchuan,Ningxia 750021,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2022年第10期1048-1055,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(41867003,41761049)
宁夏自然科学基金资助项目(2020AAC03049)
宁夏青年科技人才托举工程资助项目
国家重点研发计划重点资助项目(2018YFC1802906)。
关键词
土壤水分
种植年限
垂直一维入渗
模型分析
一维代数模型
宁夏
soil moisture
planting years
one-dimensional vertical infiltration
model analysis
one-dimensional algebraic model
Ningxia
