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三峡库区河流水体碳变化驱动力分析

Drivers for Carbon Variation of River in Three GorgesReservoir Area
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摘要 为探究流域景观特征对河流碳循环过程的影响,综合运用景观指数法、冗余分析(RDA)法和Pearson相关性分析法,分析长江三峡库区段景观因子对河流碳循环的影响。结果表明:长江三峡库区段土地利用和景观格局对水体溶解性碳浓度和水-气界面CO_(2)、CH_(4)通量影响最大的缓冲区尺度为1500 m;1500 m缓冲区内影响水体溶解性碳的关键变量有建筑用地和林地,影响水-气界面CO_(2)和CH_(4)通量的关键变量有建筑用地、林地、草地、耕地、裸地、香农多样性指数(SHDI)和斑块丰富度(PRD)。 Understanding the impact of land use and landscape patterns on river carbon cycling is crucial for improving the watershed environment.This study utilized the landscape index method,redundancy analysis(RDA),and Pearson correlation analysis to analyze the effects of landscape factors on river carbon cycling in the Three Gorges Reservoir area.The findings reveal that:1)Within a buffer zone scale of 1500 m,the land use and landscape patterns have a substantial impact on the concentration of dissolved carbon in water and the fluxes of CO_(2)and CH_(4)at the water-air interface.2)The dissolved carbon within the 1500 m buffer zone is influenced by several key variables,including built-up land,and forest land.For CO_(2)and CH_(4)fluxes at the water-air interface,influential variables include built-up land,forest land,grassland,arable land,bare land,Shannon’s diversity index(SHDI),and patch richness density(PRD).
作者 程学军 付重庆 肖潇 张双印 徐坚 郑航 廖茂昕 CHENG Xue-jun;FU Chong-qing;XIAO Xiao;ZHANG Shuang-yin;XU Jian;ZHENG Hang;LIAO Mao-xin(Spatial Information Technology Application Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Wuhan Smart Basin Engineering Technology Research Center,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China)
出处 《长江科学院院报》 CSCD 北大核心 2024年第12期66-72,100,共8页 Journal of Changjiang River Scientific Research Institute
基金 中央级公益性科研院所基本科研业务费项目(CKSF2023296/KJ) 湖南省重大水利科技项目(XSKJ2022068-12) 2022年度知识创新专项基础研究项目(2022010801010238)。
关键词 土地利用 景观指数 温室气体 溶解性无机碳 溶解性有机碳 缓冲区 land use landscape index greenhouse gases dissolved inorganic carbon(DIC) dissolved organic carbon(DOC) buffer zones
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