农业资源与环境学报2024，Vol.41Issue(4)：816-825,10.DOI:10.13254/j.jare.2023.0496
海河平原典型区表层土壤有机碳库变化及影响因素
Changes and influencing factors of topsoil organic carbon pool in the typical region of Haihe Plain:a case study of Jinnan District,Tianjin
摘要
Abstract
The changes in topsoil organic carbon pool and its main influencing factors were investigated in the typical area of the Haihe Plain,based on soil survey data obtained in 1980 and 2016.Geostatistical methods were employed to analyze the changes in soil organic carbon density(SOCD)and soil organic carbon pool.Linear regression and random forest models were used to analyze the primary influencing factors of soil organic carbon(SOC).The results showed that the storage capacity of the topsoil organic carbon pool of 2016 in Jinnan District was 1.14×106 t,which increased by 6.61×104 t compared with that in 1980.SOCD was closely related to the soil-forming parent material,and the SOCD values were ranked as follows:alluvium>alluvial-marine deposit>lake marsh deposit in different periods.The distribution of high SOCD values in two periods was similar,mainly distributed in the northwest of Jinnan District and near Xianshuigu Town in the center of Jinnan District,and the variation of SOCD from 1980 to 2016 showed a decreasing and increasing trend in the north and south,respectively.The change in organic carbon(∆SOC)was affected by soil physicochemical properties and land use change(LUC),in which the changes in soil total nitrogen(∆TN),carbon to nitrogen ratio(C/N),and nitrogen to phosphorus ratio(N/P)were significantly positively correlated with∆SOC(P<0.01),and initial soil organic carbon(ISOC),CaO content,and change in pH(∆pH)were significantly negatively correlated with ∆SOC(P<0.05).The findings indicated that the SOC pool acts as"carbon source"when agricultural land is converted to urban land,whereas it serves as a"carbon sink"when the nature of the agricultural land remains unchanged,and the changes in∆TN,C/N,N/P,and LUC play an important role in SOC dynamic changes.关键词
土壤有机碳/时空分布/随机森林/海河平原Key words
soil organic carbon/spatiotemporal distribution/random forest/Haihe Plain分类
农业科技引用本文复制引用
李硕,刘汉粮,孙少波,刘永涛,程绪江,张亚娜..海河平原典型区表层土壤有机碳库变化及影响因素[J].农业资源与环境学报,2024,41(4):816-825,10.基金项目
中央级公益性科研院所基本科研业务费项目(AS2022P03) （AS2022P03）
天津市国土资源和房屋管理局项目(国土房任[2015]3号) （国土房任[2015]3号）
中国地质调查局地质调查项目(12120113002000) The National Nonprofit Institute Research Grant of IGGE(AS2022P03) （12120113002000）
The Project of Tianjin Municipal Bureau of Land Resources and Housing Management(Guotufangren[2015]3) （Guotufangren[2015]3）
Geological Survey Project of China Geological Survey(12120113002000) （12120113002000）
