典型文献
Anthropogenic land use substantially increases riverine CO2 emissions
文献摘要：
Carbon dioxide(CO2)emissions from inland waters to the atmosphere are a pivotal com-ponent of the global carbon budget.Anthropogenic land use can influence riverine CO2 emissions,but empirical data exploring cause-effect relationships remain limited.Here,we investigated CO2 partial pressures(pCO2)and degassing in a monsoonal river(Yue River)within the Han River draining to the Yangtze in China.Almost 90％of river samples were supersaturated in CO2 with a mean±standard deviation of 1474±1614 μatm,leading to emissions of 557-971 mmol/m2/day from river water to the atmosphere.Annual CO2 emis-sions were 1.6-2.8 times greater than the longitudinal exports of riverine dissolved inor-ganic and organic carbon.pCO2 was positively correlated to anthropogenic land use(urban and farmland),and negatively correlated to forest cover.pCO2 also had significant and pos-itive relationships with total dissolved nitrogen and total dissolved phosphorus.Stepwise multiple regression models were developed to predict pCO2.Farmland and urban land re-leased nutrients and organic matter to the river system,driving riverine pCO2 enrichment due to enhanced respiration in these heterotrophic rivers.Overall,we show the crucial role of land use driving riverine pCO2,which should be considered in future large-scale estimates of CO2 emissions from streams.Land use change can thus modify the carbon balance of urban-river systems by enhancing river emissions,and reforestation helps carbon neutral in rivers.
文献关键词：
中图分类号：
作者姓名：
Shijie Gu;Siyue Li;Isaac R.Santos
作者机构：
School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Reservoir Aquatic Environment,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Chongqing School,University of Chinese Academy of Sciences,Chongqing 400714,China;Research Center for Environmental Ecology and Engineering,Institute of Changjiang Water Environment and Ecological Security,School of Environmental Ecology and Biological Engineering,Key Laboratory for Green Chemical Process of Ministry of Education,Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province,Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,Wuhan Institute of Technology,Wuhan 430205,China;Department of Marine Sciences,University of Gothenburg,Gothenburg 41296,Sweden;National Marine Science Centre,Southern Cross University,Coffs Harbour,NSW 2450,Australia
文献出处：
引用格式：
[1]Shijie Gu;Siyue Li;Isaac R.Santos-.Anthropogenic land use substantially increases riverine CO2 emissions)[J].环境科学学报（英文版）,2022(08):158-170
A类：
Farmland
B类：
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AB值：
0.560331
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