Soil organic carbon increase on conversion of native savanna to improved pasture in two regions of Colombia  

作　　者：Sandra Loaiza Ciniro Costa Jr Mayesse A.da Silva Ngonidzashe Chirinda Idupulapati Rao Jacobo Arango Jeimar Tapasco Glenn Hyman 

机构地区：[1]The Alliance of Bioversity International and the International Center for Tropical Agriculture,Cali,Colombia [2]Pontificia Universidad Javeriana Cali,Cali,Colombia [3]Mohammed VI Polytechnic University(UM6P),AgroBioSciences(AgBS),Agricultural Innovations and Technology Transfer Centre(AITTC),Benguerir,Morocco [4]Independent Researcher,Yumbo,Colombia

出　　处：《Grassland Research》2024年第4期318-330,共13页草地研究(英文)

基　　金：The Bezos Earth Fund Project"Using genetic diversity to capture carbon through deep root systems in tropical soils";The Colombian Ministry of Agriculture and Rural Development;The CGIAR Initiative on Low Emissions Food Systems;LivestockPlus project。

摘　　要：Background:There is limited knowledge on how to increase soil organic car-bon(SOC)stocks under tropical conditions.This study investigates SOC changes after converting land from native savanna(NS)to improved pasture(IP)land use.Methods:Two acidic soil conversion sites were examined:(i)a poorly drained slope with medium‐texture soil(Casanare[CAS]1)and(ii)flat terrain withfine‐texture soil(CAS2).Anotherflat site was evaluated(Atlántico[ATL]),withfine‐textured to moderately textured neutral soil.Soil samples were col-lected and analyzed.SOC stocks(0–60 cm soil depth)were estimated,with a complex analysis of variance analyzing pasture type and soil depth.Results:NS to IP conversion resulted in significant SOC accumulation in two regions,with losses in one(CAS2).ATL showed higher SOC accumulation than CAS.IP adoption led to SOC accumulation at depth(0–60 cm)after 10 years in CAS1.Elevated clay content in CAS2 favored SOC storage,while poorly drained areas hindered accumulation in CAS1.Cultivating rice before IP at CAS2 likely depleted SOC(0–20 cm),with 4 years of IP not restoring initial levels.Conclusions:Adopting IP over NS can increase SOC.Grassland type,soil properties,and land‐use change all influence SOC accumulation.These data inform sustainable land management for low‐emission livestock production.

关 键 词：deep‐rooted improved grasses land use change native savanna soil carbon accumulation soil properties 

分 类 号：S15[农业科学—土壤学]