Deposition of eroded soil on terraced croplands in Minchet catchment,Ethiopian Highlands  

作　　者：Alemtsehay Subhatu Tatenda Lemann Kaspar Hurni Brigitte Portner Tibebu Kassawmar Gete Zeleke Hans Hurni 

机构地区：[1]Centre for Development and Environment,University of Bern,Hallerstrasse 10,3012 Bern,Switzerland [2]Institute of Geography,University of Bern,Hallerstrasse 12,3012 Bern,Switzerland [3]Water and Land Resource Centre,Diaspora Square,Megenagna,PO Box 3880,Addis Abeba,Ethiopia

出　　处：《International Soil and Water Conservation Research》2017年第3期212-220,共9页国际水土保持研究（英文）

基　　金：supported by the Centre for Development and Environment,and the Institute of Geography,both at the University of Bern;the Water and Land Resource Centre,Ethiopia;the International Foundation for Science(research grant agreement number NO.C/5838-1).

摘　　要：In the Ethiopian Highlands,soil and water conservation practices are of utmost importance to conserve eroded soil and combat soil loss.This study provides detailed results on on-site sediment deposition and net soil loss in terraced croplands in a catchment in the sub-humid Ethiopian Highlands.Sediment deposition was measured on horse bean and maize fields during the crop growing seasons of 2014 and 2015.Measurements took place on observation plots on terraced cropland with varying spacing between terraces and varying slope gradients.Net soil loss,in this case the amount leaving the terraced cropland,was calculated by modelling the Universal Soil Loss Equation(USLE)for the whole observation field and subtracting the measured sediment deposition.The study result showed about 8–11 t ha^(−1) sediment was deposited in the deposition zone of the terraced cropland,with greater sediment deposition on terraces with narrow spacing and steeper slope gradients.Sediment deposition was highest in July and August,and relatively low in September.Annual soil loss ranged from 32 to 37 t ha^(−1) in the terraced cropland of the study area.From the total soil loss in the crop growing season,about 54–74%sediment was deposited on the deposition zone of terraced crop fields.Implementation of soil and water conservation with narrow spacing,especially on the steep slopes of the sub-humid Ethiopian Highlands or other similar area,are thus highly recommended as they enable conservation of the eroded soil in the cropland.

关 键 词：Sediment Deposition Soil Loss Soil and Water Conservation Ethiopian Highlands 

分 类 号：S15[农业科学—土壤学]