Impacts of land use and salinization on soil inorganic and organic carbon in the middle-lower Yellow River Delta  

作　　者：Yang GUO Xiujun WANG Xianglan LI Minggang XU Yuan LI Haonan ZHENG Yongming LUO Pete SMITH 

机构地区：[1]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875(China) [2]Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agriculture Sciences,Beijing 100081(China) [3]Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003(China) [4]Institute of Biological and Environmental Sciences,University of Aberdeen,Aberdeen AB243UU(UK)

出　　处：《Pedosphere》2021年第6期839-848,共10页土壤圈（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.41877028 and 41205104);a UK-China Virtual Joint Centre on Nitrogen,funded by the Newton Fund via Biotechnology and Biological Sciences Research Council(BBSRC)(No.BB/N013484/1)。

摘　　要：Soil inorganic carbon(SIC)is an important reservoir of carbon(C)in arid,semi-arid,and semi-humid regions.However,knowledge is incomplete on the dynamics of SIC and its relationship with soil organic C(SOC)under different land use types in the semi-humid region,particularly in coastal zones impacted by soil salinization.We collected 170 soil samples from 34 profiles across various land use types(maize-wheat,cotton,paddy,and reed)in the middle-lower Yellow River Delta(YRD),China.We measured soil pH,electrical conductivity(EC),water-soluble salts,and SOC and SIC contents.Our results showed significant differences in both SOC and SIC among land use types.The dry cropland(maize-wheat and cotton)soils had significantly higher SOC and SIC densities(4.71 and 15.46 kg C m^(-2),respectively)than the paddy soils(3.28 and 14.09 kg C m^(-2),respectively)in the 0–100 cm layer.Compared with paddy soils,reed soils contained significantly higher SOC(4.68 kg C m^(-2))and similar SIC(15.02 kg C m^(-2))densities.There was a significant positive correlation between SOC and SIC densities over a 0–100 cm soil depth in dry cropland soils,but a negative relationship in the paddy soils.On average,SOC and SIC densities under maize-wheat cropping were 15%and 4%lower,respectively,in the salt-affected soils in the middle-lower YRD than the upper YRD.This study indicated that land use types had great influences on both SOC and SIC and their relationship,and salinization had adverse effect on soil C storage in the YRD.

关 键 词：C densities C stocks land use type salt-affected soil soil salinization 

分 类 号：S156.4[农业科学—土壤学]