离心机与压力板仪测定土壤水分特征曲线比较  

Comparison of centrifuge and pressure plate on soil water retention curve determination

作　　者：周卓丽 张卓栋 高晓飞 曲新苗 何恩佩 ZHOU Zhuoli;ZHANG Zhuodong;GAO Xiaofei;QU Xinmiao;HE Enpei(State Key Laboratory of Earth Surface Processes and Resource Ecology,MOE Engineering Research Center of Desertification and Blown-sand Control,Faculty of Geographical Science,Beijing Normal University,100875,Beijing,China;Patent Examination Cooperation Sichuan Center of the Patent Office,CNIPA,610213,Chengdu,China)

机构地区：[1]北京师范大学地理科学学部地表过程与资源生态国家重点实验室防沙治沙教育部工程研究中心,北京100875 [2]国家知识产权局专利局专利审查协作四川中心,成都610213

出　　处：《中国水土保持科学》2022年第4期101-108,共8页Science of Soil and Water Conservation

基　　金：国家自然科学基金“西南黄壤区不同尺度土壤侵蚀与泥沙运移规律耦合关系”(41730748);国家重点研发计划课题“气候变化对生态系统土壤保持服务的影响”(2017YFA0604704)。

摘　　要：为探究不同土壤类型的土壤水分特征曲线测定差异,采用离心机和压力板仪测定黑土、黄绵土、红壤、紫色土、褐土0~15300 cm吸力范围的土壤水分特征曲线,对比2种测定方法的结果差异并分析其原因。结果表明:在低吸力段,离心机测定的5种土壤的含水率低于压力板仪,在高吸力段则相反;黑土、黄绵土、褐土和紫色土在高吸力段2种方法的测定具有极显著差异(P<0.01);红壤低吸力段的测定差异显著(P<0.05),高吸力段2种方法测定的含水率十分接近。土壤质地、孔隙分布是影响不同土壤类型2种方法测定差异的主要原因:对于砂粒含量高的土壤类型,离心机测定过程中体积压缩明显导致测定结果不精确;对于黏粒、粉粒含量较高的土壤类型,离心机法相对更为适用。[Background]Accurate and efficient determination of soil water retention curve is important for the study of soil water movement and soil erosion.Various measurement methods are based on different mechanisms and each method has different applicability.Comparing method differences across multiple soil types can reflect the influence of soil properties on measurement results of equipment and provide a reference for selecting suitable methods for determining soil water retention curve.[Methods]Centrifuge and pressure plate were used to determine the soil water retention curve of black soil,loessal soil,red soil,cinnamon soil and purple soil in the water erosion region.The determination range of 2 methods was 0-15300 cm,and the data were divided into the low suction stage(0-1000 cm)and the high suction stage(>1000-15300 cm)to analyze the differences between the two methods.A paired samples t test was used to test the significance of the differences in soil volume water content determined by centrifuge and pressure plate.[Results]The water content of 5 soils measured by the centrifuge was lower than that of the pressure plate at low suction stage,contents while the result at high suction stage was the opposite pattern.The measurement results of black soil,loessal soil,cinnamon soil and purple soil had extremely significant differences(P<0.01)at high suction stage.The measurement difference of red soil was significant(P<0.05)at low suction stage,and the water contents measured by the 2 methods at high suction stage were very close.At high suction stage,soil types with high clay and silt content caused incomplete soil drainage due to insufficient balance time in the pressure plate,which was significantly different from the water content determined by the centrifuge.Soil types with high sand content were mainly affected by the change of bulk density at low suction stage,which obviously caused the centrifuge measurement result to be lower than that of the pressure plate.[Conclusions]Soil texture and pore distribution are

关 键 词：土壤水分特征曲线 孔隙度 离心机 压力板仪 土壤类型 

分 类 号：S152.7[农业科学—土壤学]