Effects of <i>Spartina</i> invasion on the soil organic carbon content in salt marsh and mangrove ecosystems in China

Xu, Xiao; Wei, Shujuan; Chen, Hongyang; Li, Bo; Nie, Ming

doi:10.1111/1365-2664.14202

Cited by 17 publications

(3 citation statements)

References 81 publications

(94 reference statements)

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“…The invasion of S. alterniflora has increased both SOC and SOCS in wetland soils. Compared with other studies, it is found that the carbon sequestration capacity of S. alterniflora is still lower than that of mature mangroves [49]. This could be attributed to the higher productivity of mature mangroves.…”

Section: Effects Of S Alterniflora Invasion On Soc and Socscontrasting

confidence: 75%

Tracking the Effects of Mangrove Changes and Spartina alterniflora Invasion on Soil Carbon Storage: A Case Study of the Beibu Gulf of Guangxi, China

Huang,

Yao,

Wang

et al. 2024

Land

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In order to clarify the long-term changes in mangroves in the Beibu Gulf of Guangxi and the carbon storage changes after the invasion of Spartina alterniflora (S. alterniflora) in the Dandou Sea area, the Continuous Change Detection and Classification (CCDC) algorithm combined with feature indices was first used to track the changes. Subsequently, the random forest algorithm was applied to classify each change segment, and then sampling was conducted based on the distribution of S. alterniflora in different invasion years. The results showed that the Kappa coefficient of the classification result of the latest change segment was 0.78. The rapid expansion of S. alterniflora, aquaculture pond construction, and land reclamation activities have led to changes in mangroves, causing a decrease in the area of the mangrove region. A total of 814.57 hectares of mangroves has been converted into other land-cover types, with most pixels undergoing one to two changes, and many of these changes were expected to continue until 2022. An analysis of the distribution characteristics and influencing factors of soil organic carbon (SOC) and soil organic carbon storage (SOCS) at different invasion stages revealed that SOC and SOCS were mainly influenced by soil bulk density, soil moisture content, and electrical conductivity. It was found that S. alterniflora had higher SOC content compared to the mudflats. With the increase in invasion years, S. alterniflora continuously increased the SOC and SOCS content in coastal wetlands.

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Section: Effects Of S Alterniflora Invasion On Soc and Socscontrasting

confidence: 75%

Tracking the Effects of Mangrove Changes and Spartina alterniflora Invasion on Soil Carbon Storage: A Case Study of the Beibu Gulf of Guangxi, China

Huang,

Yao,

Wang

et al. 2024

Land

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“…Furthermore, it is widely recognized that invasive S. alterniflora grows faster and has higher primary productivity than its native counterparts (e.g., P. australis and S. mariqueter ) (Liao et al, 2007; Zhang et al, 2010), easily leading us to assume that S. alterniflora can increase the blue carbon sink in Chinese saltmarshes. However, the greater carbon sequestration of S. alterniflora may not be long‐lasting due to its faster decomposition than the native, which was also confirmed by a meta‐study that showed that S. alterniflora invasion did not significantly increase soil carbon content compared with native species along the east coast of China (Xu et al, 2022). Collectively, these results suggested that the minor benefit of carbon sequestration provided by S. alterniflora may be too minimal to compensate for its negative impacts on native biodiversity and ecosystem services.…”

Section: Discussionmentioning

confidence: 78%

Leaf litter decomposition and its drivers differ between an invasive and a native plant: Management implications

Cheng

Liu

Zhang

et al. 2022

Ecological Applications

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Litter decomposition is a key process of the carbon cycle in terrestrial and aquatic ecosystems. The dominant conceptual model of litter decomposition assumes that environmental conditions, litter traits, and decomposer composition control litter decomposition in a decreasing order, yet whether this hierarchical model applies to both invasive and native plant species is unknown. Here, by comparing a widespread invasive plant and its native counterpart in Chinese coastal saltmarshes, we aimed to examine whether the hierarchy of factors controlling litter decomposition varies with plant species in the face of plant invasions. Leaf litter of invasive Spartina alterniflora and native Phragmites australis was collected across an 18° latitudinal range to capture wide variation in litter traits. These leaf litter samples were transported to three saltmarsh sites of different latitudes and were incubated in litterbags varying in mesh size (0.1, 2, and 5 mm) to manipulate decomposer composition. After 90‐day incubation, we found a parallel latitudinal pattern in leaf litter decomposition rate (k) between S. alterniflora and P. australis regardless of saltmarsh site and mesh size. Nonetheless, the k value of S. alterniflora was 2.2‐fold higher than that of P. australis. Moreover, there was a shift in the hierarchy of factors controlling k values between S. alterniflora and P. australis: environmental conditions (climate and soil) dominated other factors in P. australis, whereas litter traits contributed more than environmental conditions in S. alterniflora. Overall, our findings show that leaf litter decomposition and its dominant controlling factors across broad geographical ranges can vary with plant invasions, having important implications for managing invasive plants in the context of conserving coastal blue carbon.

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“…However, the SOC stock in existing coastal wetlands would be exposed to threats of land‐sea warming (Fan & Li, 2022), Spartina alterniflora invasion (Xia et al., 2021), and sea‐level rise (Wang et al., 2019). The SOC stocks in mangroves and salt marshes might be substantially reduced after S. alterniflora invasion (Xu et al., 2022), and more efforts are suggested to focus on restoring native vegetation. For the mangrove ecosystem, forest thinning with mixed species along the seaward fringe was an effective nature‐based solution for preventing S. alterniflora invasion and enhancing the organic carbon sink (Chen et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

China's conservation and restoration of coastal wetlands offset much of the reclamation‐induced blue carbon losses

Fan,

2023

Global Change Biology

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China's coastal wetlands have experienced large losses and gains with rapid coastal reclamation and restoration since the end of the 20th century. However, owing to the difficulties in mapping soil organic carbon (SOC) in blue carbon stocks of coastal wetlands on a national scale, little is known about the spatial pattern of SOC stock in China's coastal wetlands and the loss and gain of SOC stock following coastal reclamation, conservation, and restoration over the past decades. Here, we developed a SOC stock map in China's coastal wetlands at 30 m spatial resolution, analyzed the spatial variability and driving factors of SOC stocks, and finally estimated SOC losses and gains due to coastal reclamation and wetland management from 1990 to 2020. We found that the total SOC stocks in China's coastal wetlands were 77.8 Tg C by 2020 with 3.6 Tg C in mangroves, 8.8 Tg C in salt marshes, and 65.4 Tg C in mudflats. Temperature, rainfall, and seawater salinity exerted the highest relative contributions to SOC spatial variability. The spatial trend of SOC density gradually decreased from south to north except for Liaoning province, with the lowest density in Shandong province. About 24.9% (19.4 Tg C) of SOC stocks in China's coastal wetlands were lost due to high‐intensity reclamation, but SOC stock gained from conservation and restoration offset the reclamation‐induced losses by 58.2% (11.3 Tg C) over the past three decades. These findings demonstrated the great potential of conservation and restoration of coastal wetlands in reversing the loss trend of blue carbon and contributing to the mitigation of climate change toward carbon neutrality. Our study provides significant spatial insights into the stocks, sequestration, and recovery capacity of blue carbon following rapid urbanization and management actions, which benefit the progress of global blue carbon management.

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Effects of Spartina invasion on the soil organic carbon content in salt marsh and mangrove ecosystems in China

Cited by 17 publications

References 81 publications

Tracking the Effects of Mangrove Changes and Spartina alterniflora Invasion on Soil Carbon Storage: A Case Study of the Beibu Gulf of Guangxi, China

Tracking the Effects of Mangrove Changes and Spartina alterniflora Invasion on Soil Carbon Storage: A Case Study of the Beibu Gulf of Guangxi, China

Leaf litter decomposition and its drivers differ between an invasive and a native plant: Management implications

China's conservation and restoration of coastal wetlands offset much of the reclamation‐induced blue carbon losses

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