Effects of sustainable land management interventions on selected soil properties in Geda watershed,central highlands of Ethiopia  

作　　者：Hailu Terefe Mekuria Argaw Lulseged Tamene Kindu Mekonnen John Recha Dawit Solomon 

机构地区：[1]Center for Environmental Science,College of Natural Science,Addis Ababa University,P.O.Box 1176,Addis Ababa,Ethiopia [2]International Center for Tropical Agriculture(CIAT),P.O.Box 5689,Addis Ababa,Ethiopia [3]International Livestock Research Institute(ILRI),P.O.Box 5689,Addis Ababa,Ethiopia [4]International Livestock Research Institute(ILRI),P.O.Box 30709,Nairobi 00100,Kenya

出　　处：《Ecological Processes》2020年第1期161-171,共11页生态过程（英文）

基　　金：This research was undertaken with support from Africa RISING,a program financed by the United States Agency for International Development(USAID)as part of the United States Government’s Feed the Future Initiative.

摘　　要：Background:Land degradation through soil erosion by water is severe in the highlands of Ethiopia.In order to curb this problem,the government initiated sustainable land management interventions in different parts of the country since 2008,and in Geda watershed since 2012.However,the impacts of the interventions on soil properties were not assessed so far.Thus,this study investigated the impacts of sustainable land management interventions on selected soil properties in Geda watershed.Soil samples were collected from treated and untreated subwatersheds at the upper and lower landscape positions,from cropland and grazing lands at two soil depths(0-15 cm and 15-30 cm).Selected soil physicochemical properties were assessed with respect to landscape position,land-use type,and soil depth in both treated and untreated sub-watersheds.Results:Generally,most of the soil physicochemical properties differed greatly across sub-watersheds,land-use types,and soil depths.Clay,electrical conductivity,total N,available P,exchangeable K,and organic carbon were higher in the treated sub-watershed,whereas sand,silt,bulk density,and pH were higher in the untreated subwatershed.The higher sand,silt,and bulk density could be attributed to erosion,while the higher pH could be due to the higher exchangeable Na in the untreated sub-watershed.Most of the selected soil chemical properties were not affected by landscape position,but land-use type affected available P and organic carbon with higher mean values at croplands than at grazing lands,which could be ascribed to the conservation structure and tillage of the soils in that conservation structures trap and accumulate transported organic materials from the upper slope,while tillage facilitates aeration and decomposition processes.Conclusion:Sustainable land management interventions improved soil physicochemical properties and brought a positive restoration of the soil ecosystem.Maintaining the soil conservation measures and enhancing community awareness about the benefits,coupled with man

关 键 词：Crop–livestock system Land degradation Land-use type Sub-watershed Soil depth 

分 类 号：S15[农业科学—土壤学]