Effects of land use and management on aggregate stability and hydraulic conductivity of soils within River Njoro Watershed in Kenya

作     者：Zachary G.Mainuri James O.Owino 

作者机构：Department of CropsHorticulture and Soil ScienceEgerton UniversityP.O.Box 536EGERTONKenya Department of Agricultural EngineeringEgerton UniversityP.O.Box 536EGERTONKenya 

出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)

年 卷 期：2013年第1卷第2期

页      面：80-87页

学科分类：0710[理学-生物学] 0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0815[工学-水利工程] 0901[农学-作物学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 090301[农学-土壤学] 

主　　题：Land use Land management Land degradation Aggregate stability 

摘      要：There has been tremendous changes in land use and management in the River Njoro Watershed during the last three *** large scale farms have been converted into smallholder farms and plantation forests have gradually been *** changes in land use and management have brought in different approaches that have triggered soil erosion and other forms of land *** objective of this study was to trace the changes in land use and determine their effects on aggregate stability and hydraulic conductivity.A semi detailed soil survey of the watershed was undertaken following a three-tier approach comprising image interpretation,field surveys and laboratory *** measured variables in the soil were analysed using ANOVA and correlation *** major land uses were found to be forestland,agricultural land,grassland,and wetland.A strong soil type_landscape relationship was observed within the *** of slopes were moderately to severely eroded,shallow and less developed whereas those on summits,pen plains,uplands,plateaus and valleys were deep and well *** stability was the highest in forestland and decreased in the order of grassland,agricultural land and wetland *** mean weight diameter under the various land use conditions was 0.68,0.64,0.58,and 041 *** conductivity was the highest in forest-land and decreased in the order of agricultural land,grassland and wetland *** was significant negative correlation between hydraulic conductivity and the bulk density and clay content of the *** aggregate stability and lowered hydraulic conductivity is likely to be responsible for some of the severe soil erosion and other forms of land degradation observed in the River Njoro Watershed.