1980—2019年人为干扰和绿色投资对长江干流有机碳的影响  

Impacts of anthropogenic disturbance and green investment on organic carbon in the Yangtze River main-stream from 1980 to 2019

作　　者：谢莹 张军[1,3] 王子腾 郭庆军 XIE Ying;ZHANG Jun;WANG Ziteng;GUO Qingjun(Key Laboratory for Resource Use and Environmental Remediation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;Sino-Danish College,University of Chinese Academy of Sciences,Beijing 101400,China;University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Environment Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院地理科学与资源研究所资源利用与环境修复重点实验室,北京100101 [2]中国科学院大学中丹学院,北京101400 [3]中国科学院大学,北京100049 [4]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [5]中国科学院大学资源与环境学院,北京100190

出　　处：《生态学杂志》2024年第11期3456-3469,共14页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41890824和41890822)资助。

摘　　要：为探讨人类活动对长江干流有机碳含量的影响,本研究收集了1980—2019年长江干流水体的有机碳含量数据,分析其时空变化特征,同时利用非参数分析、方差分解和层次分割统计方法,定性和定量分析了人为干扰和绿色投资与长江干流有机碳含量之间的关系。结果表明:1980—2019年长江干流溶解有机碳(DOC)浓度呈上升趋势,颗粒有机碳(POC)含量呈先降低后升高趋势。在三峡蓄水和运行时期,DOC与POC含量均存在显著的空间差异;而在三峡蓄水前期,空间差异不显著。2003—2019年DOC入海通量总体呈上升趋势,POC与之相反呈波动下降趋势。2003—2019年总有机碳的平均入海通量为3.66 Tg C·a^(-1)。人为干扰和环境治理投资对丰水期有机碳含量影响较大,分别解释了66.33%和44.00%的DOC和POC含量变化;污废水治理投资对枯水期DOC和POC影响较大,营林投资是丰水期DOC变化贡献最大的因子。To understand the impacts of human activities on organic carbon content in the Yangtze River main-stream,we analyzed the spatial and temporal variations of organic carbon content in the Yangtze River mainstream by collecting data from 1980 to 2019.Non-parametric analysis,variation partitioning analysis,and hierarchical par-titioning were used to investigate the effects of anthropogenic disturbance and green investment.The results showed an increasing trend of dissolved organic carbon(DOC)concentration in the Yangtze River mainstream over the past 40 years,but a decreasing and then increasing trend of particulate organic carbon(POC)content.The spatial vari-ations of DOC and POC contents over the river were significant during the Three Gorges Dam impoundment and operation periods,while the spatial variations were not significant during pre-Three Gorges Dam impoundment peri-od.DOC transport fluxes generally increased from 2003 to 2019,while POC showed a fluctuating downward trend.The average total organic carbon flux from 2003 to 2019 was 3.66 Tg C·a^(-1).Human activities and green invest-ments contributed more organic carbon content during the wet season,which accounted for 66.33%and 44.00%of the variations in DOC and POC,respectively.Investment in industrial and domestic wastewater treatments had a greater effect on DOC and POC in the river during the dry season,whereas forestry investment contributed more on DOC in the wet season.

关 键 词：人类活动 环境治理投资 溶解有机碳 颗粒有机碳 时空变化 三峡大坝 

分 类 号：X143[环境科学与工程—环境科学]