Education Key Laboratory for Biodiversity Science and Ecological Engineering, Fudan University, 2005 Songhu Road, Shanghai, 200438, China.
Research Institute of Natural Ecology Conservation, Shanghai Academy of Environmental Sciences, 508 Qinzhou Road, Shanghai, 200233, China.
Sci Rep. 2018 Jan 12;8(1):628. doi: 10.1038/s41598-017-19111-1.
The carbon cycle is significantly affected by Spartina alterniflora invasion through its impact on blue carbon in many salt marshes. To determine the impacts on soil organic carbon (SOC), we studied the vertical and horizontal distribution of SOC. And stable carbon isotopes were used to explore the impact of the age of S. alterniflora invasion on SOC in Chongming Dongtan wetland located in the Yangtze River estuary, China. The results showed that the SOC concentration was higher in the S. alterniflora community than that in the native Phragmites australis community. The age of invasion and the SOC concentration increased with increasing elevation, while the SOC concentration decreased with increasing soil depth. The δC value became less negative at greater depth, which was related to the contribution from C- enriched carbon sources after 3 years of invasion. After 7 and 10 years, the δC value became more negative at greater depth in both communities. S. alterniflora had a positive effect on the soil carbon pool, and its contribution was related to soil depth. In the low tidal marshes, the contribution of S. alterniflora was negatively correlated with soil depth, while it was positively correlated with soil depth in the high tidal marshes. The results from this study will contribute to improved understanding of future ecological consequences.
互花米草入侵通过影响许多盐沼的蓝碳显著影响碳循环。为了确定对土壤有机碳（SOC）的影响，我们研究了 SOC 的垂直和水平分布。并使用稳定的碳同位素来探索中国长江口崇明东滩湿地互花米草入侵对 SOC 的年龄的影响。结果表明，SOC 浓度在互花米草群落中高于本地芦苇群落。入侵年龄和 SOC 浓度随海拔升高而增加，而 SOC 浓度随土壤深度增加而降低。在更大的深度，δC 值变得不那么负，这与入侵 3 年后富含 C 的碳源的贡献有关。在 7 年和 10 年后，两个群落中更深的地方的 δC 值变得更负。互花米草对土壤碳库有积极影响，其贡献与土壤深度有关。在低潮滩，互花米草的贡献与土壤深度呈负相关，而在高潮滩则与土壤深度呈正相关。本研究的结果将有助于更好地了解未来的生态后果。
