土壤类型和容重对离心机法测定土壤水分特征曲线的影响  

Effects of Soil Type and Bulk Density on Determining Water Retention Curve by Centrifuge

作　　者：张鹏飞 贾小旭[2,3] 任利东 赵春雷 邵明安 ZHANG Pengfei;JIA Xiaoxu;REN Lidong;ZHAO Chunlei;SHAO Ming’an(College of Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China;Yellow River Delta Modern Agricultural Engineering Laboratory,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]中国科学院地理科学与资源研究所黄河三角洲现代农业工程实验室,北京100101 [3]中国科学院大学资源与环境学院,北京100190

出　　处：《土壤》2024年第3期586-592,共7页Soils

基　　金：国家自然科学基金面上项目(42022048);中国科学院战略性先导科技专项(XDB40020305)资助。

摘　　要：本研究以杨凌塿土和嫩江黑土为研究对象,分别设置了4个土壤容重处理(1.0、1.1、1.2、1.3 g/cm^(3)),利用离心机法测定土壤失水过程,以压力膜仪法为标准,对比不同吸力下的含水量实测值和van Genuchten模型参数的差异。结果表明,随着土壤容重的增加,离心机法测定土壤水分特征曲线准确度逐渐增加,获取黑土和塿土的van Genuchten模型参数α的准确度增幅分别为38.46%~83.08%和56.38%~95.75%。离心机法测定土壤水分特征曲线的准确度在不同吸力段表现不同,近饱和段(0~10 kPa)离心机法测定值偏低,而高吸力段(10~1500 kPa)测定值偏高,且高吸力段离心机法测定准确度较低,与压力膜仪法测定值具有极显著差异(P<0.01)。综上所述,为了提高离心机法测定土壤水分特征曲线的准确度,优先考虑应用于大容重和高有机质含量的土壤。In this study,Lou soil in Yangling and Mollisol in Nenjiang were selected,and four gradients of soil bulk density(1.0,1.1,1.2,1.3 g/cm^(3))were set,centrifuge and pressure plate methods were used to determine soil water retention curve(SWRC),and the van Genuchten(VG)model was used to fit SWRC.The results showed that with the increase of bulk density,the accuracy of centrifuge method gradually increased,and the accuracy of obtained parameterαof van Genuchten model increased by 38.46%-83.08%in Mollisol and 56.38%-95.70%in Lou soil.Centrifuge method had different performances in different suction sections,the measured value was lower near saturation suction(0-10 kPa),but higher in the high suction(10-1500 kPa)with low accuracy,which was significantly(P<0.01)different with pressure plate method.In conclusion,centrifuge method is recommended to determine SWRC for soils with large bulk density and high organic matter content.

关 键 词：土壤水分特征曲线 土壤容重 离心机法 压力膜仪法 

分 类 号：S152.7[农业科学—土壤学]