Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China
Wetlands are critical components of the global carbon cycle, yet their carbon sink dynamics under hydrological fluctuations remain insufficiently understood. This study employed the Carnegie-Ames-Stanford Approach (CASA) model to estimate the net ecosystem productivity (NEP) of the Dongting Lake wet...
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2025-07-01
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| author | Mengshen Guo Nianqing Zhou Yi Cai Xihua Wang Xun Zhang Shuaishuai Lu Kehao Liu Wengang Zhao |
| author_facet | Mengshen Guo Nianqing Zhou Yi Cai Xihua Wang Xun Zhang Shuaishuai Lu Kehao Liu Wengang Zhao |
| author_sort | Mengshen Guo |
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| description | Wetlands are critical components of the global carbon cycle, yet their carbon sink dynamics under hydrological fluctuations remain insufficiently understood. This study employed the Carnegie-Ames-Stanford Approach (CASA) model to estimate the net ecosystem productivity (NEP) of the Dongting Lake wetland and explored the spatiotemporal dynamics and driving mechanisms of carbon sinks from 2000 to 2022, utilizing the Theil-Sen median trend, Mann-Kendall test, and attribution based on the differentiating equation (ADE). Results showed that (1) the annual mean spatial NEP was 50.24 g C/m<sup>2</sup>/a, which first increased and then decreased, with an overall trend of −1.5 g C/m<sup>2</sup>/a. The carbon sink was strongest in spring, declined in summer, and shifted to a carbon source in autumn and winter. (2) Climate variability and human activities contributed +2.17 and −3.73 g C/m<sup>2</sup>/a to NEP, respectively. Human activities were the primary driver of carbon sink degradation (74.30%), whereas climate change mainly promoted carbon sequestration (25.70%). However, from 2000–2011 to 2011–2022, climate change shifted from enhancing to limiting carbon sequestration, mainly due to the transition from water storage and lake reclamation to ecological restoration policies and intensified climate anomalies. (3) NEP was negatively correlated with precipitation and water level. Land use adjustments, such as forest expansion and conversion of cropland and reed to sedge, alongside maintaining growing season water levels between 24.06~26.44 m, are recommended to sustain and enhance wetland carbon sinks. Despite inherent uncertainties in model parameterization and the lack of sufficient in situ flux validation, these findings could provide valuable scientific insights for wetland carbon management and policy-making. |
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| publishDate | 2025-07-01 |
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| spelling | doaj-art-5634d60630ac4afab4d69998fb703fb52025-08-20T02:47:14ZengMDPI AGRemote Sensing2072-42922025-07-011714247510.3390/rs17142475Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, ChinaMengshen Guo0Nianqing Zhou1Yi Cai2Xihua Wang3Xun Zhang4Shuaishuai Lu5Kehao Liu6Wengang Zhao7Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaHunan Institute of Water Resources and Hydropower Research, Changsha 410007, ChinaWetlands are critical components of the global carbon cycle, yet their carbon sink dynamics under hydrological fluctuations remain insufficiently understood. This study employed the Carnegie-Ames-Stanford Approach (CASA) model to estimate the net ecosystem productivity (NEP) of the Dongting Lake wetland and explored the spatiotemporal dynamics and driving mechanisms of carbon sinks from 2000 to 2022, utilizing the Theil-Sen median trend, Mann-Kendall test, and attribution based on the differentiating equation (ADE). Results showed that (1) the annual mean spatial NEP was 50.24 g C/m<sup>2</sup>/a, which first increased and then decreased, with an overall trend of −1.5 g C/m<sup>2</sup>/a. The carbon sink was strongest in spring, declined in summer, and shifted to a carbon source in autumn and winter. (2) Climate variability and human activities contributed +2.17 and −3.73 g C/m<sup>2</sup>/a to NEP, respectively. Human activities were the primary driver of carbon sink degradation (74.30%), whereas climate change mainly promoted carbon sequestration (25.70%). However, from 2000–2011 to 2011–2022, climate change shifted from enhancing to limiting carbon sequestration, mainly due to the transition from water storage and lake reclamation to ecological restoration policies and intensified climate anomalies. (3) NEP was negatively correlated with precipitation and water level. Land use adjustments, such as forest expansion and conversion of cropland and reed to sedge, alongside maintaining growing season water levels between 24.06~26.44 m, are recommended to sustain and enhance wetland carbon sinks. Despite inherent uncertainties in model parameterization and the lack of sufficient in situ flux validation, these findings could provide valuable scientific insights for wetland carbon management and policy-making.https://www.mdpi.com/2072-4292/17/14/2475NEPcarbon sinkslake wetlanddriving mechanismsclimate factorsanthropogenic factors |
| spellingShingle | Mengshen Guo Nianqing Zhou Yi Cai Xihua Wang Xun Zhang Shuaishuai Lu Kehao Liu Wengang Zhao Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China Remote Sensing NEP carbon sinks lake wetland driving mechanisms climate factors anthropogenic factors |
| title | Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China |
| title_full | Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China |
| title_fullStr | Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China |
| title_full_unstemmed | Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China |
| title_short | Quantitative Estimation of Vegetation Carbon Source/Sink and Its Response to Climate Variability and Anthropogenic Activities in Dongting Lake Wetland, China |
| title_sort | quantitative estimation of vegetation carbon source sink and its response to climate variability and anthropogenic activities in dongting lake wetland china |
| topic | NEP carbon sinks lake wetland driving mechanisms climate factors anthropogenic factors |
| url | https://www.mdpi.com/2072-4292/17/14/2475 |
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