摘要
厘清土壤有机碳密度(SOCD)时空变化对改进全球碳循环管理和改善当地生态环境具有重要意义,因此有必要对区域SOCD的时空分布和影响因素进行研究.收集了安徽省1980年和2021年共614个土壤剖面信息,分析安徽省不同地理区域和土地利用的SOCD时空变化,采用结构方程模型(SEM)探究SOCD的影响因素.结果表明,(1)1980年和2021年安徽省的SOCD大小在空间分布上表现为:皖南丘陵山区>皖西大别山区>沿江平原>江淮丘陵岗地>淮北平原.自1980~2021年,淮北平原、江淮丘陵岗地SOCD增加,沿江平原、皖西大别山区和皖南丘陵山区SOCD下降.与1980年相比,2021年旱地的SOCD增幅最大,林地的SOCD降幅最大.(2)结构方程模型分析表明,年均降水量、土地利用、施肥量、NDVI和地形对SOCD有极显著正效应,年均温对SOCD有极显著负效应.1980年安徽省0~30 cm土层中地形是影响SOCD空间分布的主要因子,30~100 cm土层中土地利用是影响SOCD空间分布的主要因子,而2021年安徽省0~100 cm土层中年均温是影响SOCD空间分布的主要因子.研究结果可以为安徽省土壤碳汇管理措施制定提供科学依据.
The spatiotemporal variation in soil organic carbon density(SOCD)is of great significance for improving global carbon cycle management and the local ecological environment,so it is necessary to study the spatiotemporal distribution and influencing factors of regional SOCD.This study collected a total of 614 soil profiles from 1980 to 2021 in Anhui Province,analyzed the temporal and spatial changes of SOCD in different geographical regions and land use in Anhui Province,and used the structural equation model(SEM)to explore the influencing factors of SOCD.The results showed that:①In 1980 and 2021,the spatial distribution of SOCD in Anhui Province was as follows:south Anhui hilly region>west Anhui mountain region>riverine plain>Jianghuai hilly downland>Huaibei plain.From 1980 to 2021,SOCD increased in Huaibei plain and Jianghuai hilly downland but decreased in the riverine plain,west Anhui mountain region,and south Anhui hilly region.The highest SOCD content among land use types in 1980 and 2021 was grass land.Compared with that in 1980,the SOCD content in uplands will increase the most in 2021,while the SOCD content in grass lands will decrease the most.②The results of structural equation model analysis showed that SOCD was positively correlated with average annual precipitation,land use,fertilizer application,NDVI,and terrain and negatively correlated with average annual temperature.In 1980,the terrain in the 0-30 cm soil layer in Anhui Province was the main factor affecting the spatial distribution of SOCD,and the land use in the 30-100 cm soil layer was the main factor affecting the spatial distribution of SOCD,while the average annual temperature in the 0-100 cm soil layer in Anhui Province in 2021 was the main factor affecting the spatial distribution of SOCD.The results provide scientific basis for the development of soil carbon sink management measures in Anhui Province.
作者
谷欣逾
赵明松
王世航
吴运金
GU Xin-yu;ZHAO Ming-song;WANG Shi-hang;WU Yun-jin(School of Geomatics,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Aviation-aerospace-ground Cooperative Monitoring and Early Warning of Coal Mining-induced Disasters of Anhui Higher Education Institutes,Anhui University of Science and Technology,Huainan 232001,China;Coal Industry Engineering Research Center of Collaborative Monitoring of Mining Area's Environment and Disasters,Huainan 232001,China;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China)
出处
《环境科学》
北大核心
2025年第12期7705-7714,共10页
Environmental Science
基金
安徽省自然科学基金项目(2208085MD88)
国家自然科学基金项目(41501226)
安徽理工大学人才引进项目(ZY020)。
