Spatial variability of soil hydraulic and physical properties in erosive sloping agricultural fields  

作　　者：Deepak Singh Alok Kumar Mishra Sridhar Patra Sankar Mariappan Nisha Singh Saswat Kumar Kar 

机构地区：[1]ICAR-Indian Institute of Soil and Water Conservation,Dehradun 248195,India [2]Sam Higginbottom University of Agriculture,Technology and Sciences,Prayagraj 211007,India [3]Hemvati Nandan Bahuguna Garhwal University,Srinagar(Garhwal)246174,India

出　　处：《Water Science and Engineering》2023年第1期57-66,共10页水科学与水工程（英文版）

摘　　要：It is essential to minimize soil quality degradation in sloping agricultural fields through stabilization and improvement of soil hydraulic properties using sustainable soil management.This study aimed to analyze the impact of different tillage practices,including conventional tillage(CT),minimum tillage(MT),and zero tillage(ZT),on soil hydraulic conductivity in a sloping agricultural field under maizeewheat rotation.The results showed that the highest runoff volume(257.40 m3),runoff coefficient(42.84%),and soil loss(11.3 t)were observed when the CT treatment was applied.In contrast,the lowest runoff volume(67.95 m3),runoff coefficient(11.35%),and soil loss(1.05 t)were observed when the ZT treatment was adopted.The soil organic carbon and aggregate mean weight diameter were found to be significantly greater(with mean values of 0.79%and 1.19 mm,respectively)with the ZT treatment than with the CT treatment.With the tilled treatments(CT and MT),substantial changes in the saturated soil hydraulic conductivity(ks),near-saturated soil hydraulic conductivity(k),and water-conducting porosity(ε)were observed between two crop seasons.These three soil parameters were significantly higher in the period after maize harvesting than in the wheat growing period.In contrast,no significant difference in these soil parameters was found when the untilled treatment(ZT)was carried out.With regard to the slope positions,ks,k,andεshowed different behaviors under different treatments.The toe slope position showed significantly lower ks andεvalues than the summit and middle slope positions.Of the evaluated tillage practices,ZT was found to be the most promising means to improve the soil hydro-physical properties and effectively reduce surface runoff and soil erosion.

关 键 词：Hydraulic conductivity MACROPORE Conservation tillage Spatiotemporal variability Soil erosion 

分 类 号：TV135.2[水利工程—水力学及河流动力学]