Soil bacterial communities and co-occurrence changes associated with multi-nutrient cycling under rice-wheat rotation reclamation in coastal wetland
Soil bacterial communities and co-occurrence changes associated with multi-nutrient cycling under rice-wheat rotation reclamation in coastal wetland
复制标题
滨海湿地稻麦轮作复垦土壤细菌群落及多养分循环共生变化
DOI：
10.1016/j.ecolind.2022.109485
复制
发表时间：
2022
影响因子：
6.9
通讯作者：
Evan Siemann
中科院分区：
文献类型：
--
作者：
Kaoping Zhang;Yu Shi;Haiying Lu;Minyan He;Wei Huang;Evan Siemann
沿海围垦是对沿海湿地生态系统的全球性威胁，但沿海围垦对地下生物多样性的影响及其对生态系统养分循环的后果仍然知之甚少。研究了滨海湿地自然植被转化为稻麦轮作6 a和30 a后土壤细菌群落、细菌共生格局和土壤多养分循环指数的变化。6年和30年稻麦轮作地土壤养分循环指数均高于自然植被滨海湿地。在细菌群落结构方面，稻麦轮作提高了滨海湿地土壤细菌α多样性，降低了β多样性和共生网络复杂性。稻麦轮作还改变了土壤细菌群落结构，增加了放线菌门和脱硫菌门的相对丰度，降低了α-变形菌门和γ-变形菌门的相对丰度。土壤细菌群落组成的变化主要受扩散限制和非扩散限制相对重要性的影响。稻麦轮作引起的土壤细菌群落变化与土壤养分循环密切相关，尤其是细菌连接的复杂性。我们的研究结果提供了实验支持，地下微生物的相互作用是维持生态系统功能的关键。
Coastal reclamation is a global threat to coastal wetland ecosystems, but the impacts of coastal reclamation on belowground biodiversity and their consequences for ecosystem nutrient cycling remain poorly understood. In this study, we examined soil bacterial communities, bacterial co-occurrence pattern and soil multi-nutrient cycling index after natural vegetated coastal wetlands were converted for 6-year and 30-year rice-wheat rotation fields. The soil multi-nutrient cycling index was higher in 6-year and 30-year rice-wheat rotation fields than natural vegetated coastal wetlands. For bacterial community, rice-wheat rotation reclamation increased soil bacterial alpha diversity but decreased beta diversity and co-occurrence network complexity than those in the vegetated coastal wetland. Rice-wheat rotation reclamation also changed soil bacterial community assemblages by increasing the relative abundance of Actinobacteriota and Desulfobacterota while decreasing the relative abundance of Alphaproteobacteria and Gammproteobacteria. Changes in the relative importance of dispersal limitation and homogenizing dispersal mainly controlled the variations in soil bacterial community assemblages. Soil bacterial community variations induced by rice-wheat reclamation were strongly related to soil multi-nutrient cycling, especially bacterial connection complexity. Our results provide experimental support that belowground microbial interactions are crucial for maintaining ecosystem functioning.