Carbon storage in typical ecosystems of coastal wetlands in Jiangsu, China: Spatiotemporal patterns and mechanisms

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Rui Zhong , Lijie Pu , Jiayi Xie , Jiaming Yao , Lu Qie , Gaili He , Xiaoqing Wang , Rui Zhang , Jiahao Zhai , Zhongshun Gong , Yumeng Lu , Jiawei Tao , Jianguo Li , Sihua Huang
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Abstract

Coastal wetlands have strong carbon storage capacity and are crucial for global carbon cycling research. To gain a detailed understanding of carbon storage and its mechanisms in coastal wetlands, we examined 15 sites in Jiangsu’s coastal wetlands, encompassing 5 typical ecosystems: Phragmites australis, Suaeda salsa, Spartina alterniflora, Mudflat, and Reclamation land. In this study, we used random forest (RF) classification algorithm based on Google Earth Engine (GEE) and Sentinel-2A dataset to accurately identify the spatiotemporal evolution of typical ecosystems in Jiangsu’s coastal wetlands. The results indicate that the Phragmites australis, Suaeda salsa, and Spartina alterniflora ecosystems are widely distributed in the central and southern of Jiangsu’s coastal wetlands, exhibiting strong patch connectivity, whereas patches in the north are relatively fragmented. On this basis, using the life-zone classification and supplemented by field measurements, the study further found that the total carbon storage decreased from 18.43 ×106tC in 2019 to 16.59 ×106tC in 2023. The overall trend exhibited a fluctuating trend of increase–decrease-increase–decrease, with higher carbon storage in the central region and lower levels in the north and south. Further exploration of the mechanisms on the spatial distribution of carbon storage revealed that the total carbon storage in Jiangsu’s coastal wetlands is primarily influenced by human activities such as vegetation harvesting, agricultural activities (planting, plowing), as well as inherent properties such as vegetation type (aboveground biomass, root depth) and soil physicochemical properties. Specifically, soil carbon pool is predominantly influenced by soil depth, total nitrogen, and NH4+-N, while vegetation carbon pool is primarily influenced by vegetation type and soil dry matter content. These methods and findings provide new insights for enhancing carbon management in coastal wetlands and formulating policies to maintain the balance of global carbon cycling processes.
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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