Wu Haobo, Zhang Zhongsheng, Zhao Wenwen, Jin Hongbiao, Sang Luan, Wu Haitao
State Key Laboratory of Black Soils Conservation and Utilization, Institute of Northeast Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130012, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Black Soils Conservation and Utilization, Institute of Northeast Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130012, China.
Sci Total Environ. 2024 May 10;924:171502. doi: 10.1016/j.scitotenv.2024.171502. Epub 2024 Mar 6.
Deciphering the biogeochemical coupling of multiple elements in soils could better mechanistic understanding of ecosystem stability response to the alien invasion. The coupling of 45 elements in soils from wetlands covered by Spartina alterniflora (Sa) was compared with that in soils covered by native Phragmites australis (Pa) in coastal regions of China. Results showed that S. alterniflora invasion not only significantly reshaped geochemical enrichment and dispersion states, but also decoupled the coupling of multiple elements in soils compared with Pa. Atomic mass emerged as the primary factor governing the coupling of multiple elements, of which a significantly positive correlation exhibited between atomic mass with elemental coupling in Pa, but no such relation was observed in SaThe coupling of lighter elements was more susceptible to and generally enhanced by the invasion of S. alterniflora compared to the heavier, of which carbon, iron (Fe), and cadmium (Cd) had the highest susceptibility. Besides atomic mass, biological processes (represented by soil organic carbon, nitrogen, phosphorus, and sulfur), interactions between sea and land (represented by salinity and pH), and their combination explained 17 %, 10 %, and 13 % variation in the coupling of multiple elements, respectively. The present work confirmed that S. alterniflora invasion was the important factor driving soil multi-element cycling and covariation in coastal wetlands.
解读土壤中多种元素的生物地球化学耦合关系，有助于更深入地从机制上理解生态系统对外来入侵的稳定性响应。在中国沿海地区，对互花米草（Sa）覆盖的湿地土壤中45种元素的耦合情况与本地芦苇（Pa）覆盖的土壤进行了比较。结果表明，与芦苇相比，互花米草入侵不仅显著重塑了地球化学富集和分散状态，还使土壤中多种元素的耦合解耦。原子质量成为控制多种元素耦合的主要因素，其中在芦苇中原子质量与元素耦合之间呈现显著正相关，但在互花米草中未观察到这种关系。与较重元素相比，较轻元素的耦合更容易受到互花米草入侵的影响，且通常会增强，其中碳、铁（Fe）和镉（Cd）的敏感性最高。除原子质量外，生物过程（以土壤有机碳、氮、磷和硫表示）、海陆相互作用（以盐度和pH表示）及其组合分别解释了多种元素耦合中17%、10%和13%的变异。本研究证实，互花米草入侵是驱动沿海湿地土壤多元素循环和共变的重要因素。
