Guangdong Key Laboratory of Applied Botany, Xiaoliang Research Station of Tropical Coastal Ecosystems, the CAS Engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China; South China National Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
Sci Bull (Beijing). 2024 Jun 30;69(12):1991-2000. doi: 10.1016/j.scib.2024.04.049. Epub 2024 Apr 25.
Spartina alterniflora has rapidly and extensively encroached on China's coastline over the past decades. Among the coastal areas invaded by S. alterniflora, at most 93% are mudflats. However, the effect of S. alterniflora invasion on soil organic carbon (SOC) stocks of coastal mudflats has not been systematically studied on a national scale. Here, we quantified the nationwide changes in SOC stocks in coastal mudflats associated with S. alterniflora invasion between 1990 and 2020. We found that S. alterniflora invasion significantly enhanced SOC stocks in coastal China. Nonetheless, the benefit of S. alterniflora invasion of coastal SOC stock may be weakened by continuing human intervention. We found that S. alterniflora invading mudflats added 2.3 Tg SOC stocks to China's coastal blue carbon, while 1.78 Tg SOC stocks were lost mainly due to human activities, resulted in a net SOC stock gain of 0.52 Tg C. These findings overturned the traditionally thought that S. alterniflora invasion would reduce ecosystem services by highlighting that the historical invasion of S. alterniflora has broadly and consistently enhanced blue carbon stock in coastal China.
互花米草在过去几十年中迅速广泛地侵占了中国的海岸线。在互花米草入侵的沿海地区，多达 93%是泥滩。然而，互花米草入侵对沿海泥滩土壤有机碳（SOC）储量的影响尚未在全国范围内进行系统研究。在这里，我们量化了 1990 年至 2020 年期间与互花米草入侵相关的沿海泥滩 SOC 储量的全国性变化。我们发现，互花米草入侵显著增加了中国沿海的 SOC 储量。尽管如此，人类活动的持续干预可能会削弱互花米草入侵对沿海 SOC 储量的益处。我们发现，入侵的互花米草为中国沿海蓝碳增加了 2.3 Tg SOC 储量，而 1.78 Tg SOC 储量主要因人类活动而流失，导致 SOC 储量净增加 0.52 Tg C。这些发现颠覆了传统观点，即互花米草入侵会降低生态系统服务功能，同时强调了互花米草的历史入侵广泛而一致地增强了中国沿海的蓝碳储量。
