School of Resources and Environment, Anhui Agricultural University, Hefei 230036, Anhui, PR China; State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
School of Resources and Environment, Anhui Agricultural University, Hefei 230036, Anhui, PR China.
Sci Total Environ. 2024 Dec 1;954:176664. doi: 10.1016/j.scitotenv.2024.176664. Epub 2024 Oct 1.
The invasion of alien plants has significant implications for vegetation structure and diversity, which could lead to changes in the carbon (C) input from vegetation and change the transformation and decomposition processes of C, thereby altering the dynamics of soil organic carbon (SOC) within ecosystems. Whether alien plant invasion increases the SOC stock and changes SOC fractions consistently within regional scales, and the underlying mechanisms driving these SOC dynamics remain poorly understood. This study investigated SOC dynamics by comparing the plots that suffered invasion and non-invasion of Solidago Canadensis across five ecological function areas in Anhui Province, China, considering climate, edaphic factors, vegetation, and soil microbes. The results demonstrated that the impact of S. Canadensis invasion on SOC storage was not consistent at each site in the 0-20 cm soil layer, as indicated by the range of SOC content (5.94-12.45 g kg) observed at non-invaded plots. Stable SOC exhibited similar response patterns with SOC to plant invasion, whereas labile SOC did not. In addition, bacterial and fungal communities were shifted in structure at each site by plant invasion. Bacterial communities exhibited greater resistance to S. Canadensis invasion than did fungal communities, as evidenced by three aspects of the resistance indices-community resistance, phylogenetic conservation, and network complexity. The mechanisms driving SOC dynamics under S. Canadensis invasion were explored using structural equation models. This revealed that fungal keystone taxa responsible for community resistance controlled stable SOC fractions. In contrast, bacterial keystone taxa had the opposite effect on labile and stable SOC. Climatic and edaphic factors were also involved in the labile and stable SOC dynamics. Overall, this study provides novel insights into the dynamics of SOC under S. Canadensis invasion on a regional scale.
外来植物的入侵对植被结构和多样性有重大影响，这可能导致植被碳（C）输入的变化，并改变 C 的转化和分解过程，从而改变生态系统内土壤有机碳（SOC）的动态。外来植物入侵是否会在区域尺度上一致增加 SOC 储量并改变 SOC 分数，以及驱动这些 SOC 动态的潜在机制仍知之甚少。本研究通过比较中国安徽省五个生态功能区受入侵和未受入侵的加拿大一枝黄花（Solidago canadensis）的样地，考虑气候、土壤因素、植被和土壤微生物，来研究 SOC 动态。结果表明，在 0-20 cm 土壤层中，加拿大一枝黄花入侵对 SOC 储存的影响在每个地点并不一致，未受入侵的样地中 SOC 含量（5.94-12.45 g kg）的范围表明了这一点。稳定 SOC 对植物入侵的响应模式与 SOC 相似，而不稳定 SOC 则不然。此外，植物入侵导致每个地点的细菌和真菌群落结构发生了变化。细菌群落对加拿大一枝黄花入侵的抵抗力大于真菌群落，这体现在三个抗性指数方面——群落抗性、系统发育保守性和网络复杂性。利用结构方程模型探讨了加拿大一枝黄花入侵下 SOC 动态的驱动机制。这表明，负责群落抗性的真菌关键类群控制着稳定 SOC 分数。相比之下，细菌关键类群对不稳定和稳定 SOC 有相反的影响。气候和土壤因素也参与了不稳定和稳定 SOC 的动态变化。总的来说，本研究为区域尺度上加拿大一枝黄花入侵下 SOC 动态提供了新的见解。
