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Habitat‐specific responses of soil organic matter decomposition to Spartina alterniflora invasion along China's coast
Plant invasions cause a fundamental change in soil organic matter (SOM) turnover. Disentangling the biogeographic patterns and key drivers of SOM decomposition and its temperature sensitivity (Q10) under plant invasion is a prerequisite for making projections of global carbon feedback. We collected soil samples along China's coast across saltmarshes to mangrove ecosystems invaded by the smooth cordgrass (Spartina alterniflora Loisel.). Microcosm experiments were carried out to determine the patterns of SOM decomposition and its thermal response. Soil microbial biomass and communities were also characterized accordingly. SOM decomposition constant dramatically decreased along the mean annual temperature gradient, whereas the cordgrass invasion retarded this change (significantly reduced slope, p < 0.05). The response of Q10 to invasion and the soil microbial quotient peaked at midlatitude saltmarshes, which can be explained by microbial metabolism strategies. Climatic variables showed strong negative controls on the Q10, whereas dissolved carbon fraction exerted a positive influence on its spatial variance. Higher microbial diversity appeared to weaken the temperature‐related response of SOM decomposition, with apparent benefits for carbon sequestration. Inconsistent responses to invasion were exhibited among habitat types, with SOM accumulation in saltmarshes but carbon loss in mangroves, which were explained, at least in part, by the SOM decomposition patterns under invasion. This study elucidates the geographic pattern of SOM decomposition and its temperature sensitivity in coastal ecosystems and underlines the importance of interactions between climate, soil, and microbiota for stabilizing SOM under plant invasion.
植物入侵会导致土壤有机质 (SOM)周转发生根本性的改变。明确植物入侵下 SOM分解的生物地理模式、关键驱动因素及其温度敏感性 (Q10) 是预测全球碳反馈的先决条件。本研究沿中国海岸带自北向南采集了盐沼、红树林及其受互花米草入侵影响的滨海湿地土壤样本，通过微宇宙培养实验分析了SOM 的分解模式及其热响应，并对土壤微生物生物量和群落组成进行了表征。结果显示:中国滨海湿地SOM的分解常数沿年均温(MAT)梯度呈显著下降变化，而互花米草入侵则延缓了这种变化趋势(变化斜率显著下降，P < 0.05)。土壤微生物呼吸熵与Q10在中纬度盐沼湿地生态系统出现峰值，微生物代谢策略的纬度变化模式可解释这一规律。气候变量对Q10表现出强烈的负作用，而土壤溶解性有机碳的比例与Q10的空间变化呈正相关。较高的土壤微生物多样性削弱了SOM分解的温度敏感性，这有利于湿地土壤有机碳的封存。不同滨海湿地类型对互花米草入侵的响应规律不一致。盐沼生态系统中SOM发生明显积累，而红树林系统则发生碳损失，互花米草入侵导致的SOM分解的纬度变化模式可以解释这一规律。本研究阐明了滨海湿地SOM分解的地理空间模式及其温度敏感性，并强调了气候、土壤和微生物群之间的相互作用是调控滨海湿地SOM响应植物入侵变化的重要驱动因素。
Habitat‐specific responses of soil organic matter decomposition to Spartina alterniflora invasion along China's coast
Plant invasions cause a fundamental change in soil organic matter (SOM) turnover. Disentangling the biogeographic patterns and key drivers of SOM decomposition and its temperature sensitivity (Q10) under plant invasion is a prerequisite for making projections of global carbon feedback. We collected soil samples along China's coast across saltmarshes to mangrove ecosystems invaded by the smooth cordgrass (Spartina alterniflora Loisel.). Microcosm experiments were carried out to determine the patterns of SOM decomposition and its thermal response. Soil microbial biomass and communities were also characterized accordingly. SOM decomposition constant dramatically decreased along the mean annual temperature gradient, whereas the cordgrass invasion retarded this change (significantly reduced slope, p < 0.05). The response of Q10 to invasion and the soil microbial quotient peaked at midlatitude saltmarshes, which can be explained by microbial metabolism strategies. Climatic variables showed strong negative controls on the Q10, whereas dissolved carbon fraction exerted a positive influence on its spatial variance. Higher microbial diversity appeared to weaken the temperature‐related response of SOM decomposition, with apparent benefits for carbon sequestration. Inconsistent responses to invasion were exhibited among habitat types, with SOM accumulation in saltmarshes but carbon loss in mangroves, which were explained, at least in part, by the SOM decomposition patterns under invasion. This study elucidates the geographic pattern of SOM decomposition and its temperature sensitivity in coastal ecosystems and underlines the importance of interactions between climate, soil, and microbiota for stabilizing SOM under plant invasion.
植物入侵会导致土壤有机质 (SOM)周转发生根本性的改变。明确植物入侵下 SOM分解的生物地理模式、关键驱动因素及其温度敏感性 (Q10) 是预测全球碳反馈的先决条件。本研究沿中国海岸带自北向南采集了盐沼、红树林及其受互花米草入侵影响的滨海湿地土壤样本，通过微宇宙培养实验分析了SOM 的分解模式及其热响应，并对土壤微生物生物量和群落组成进行了表征。结果显示:中国滨海湿地SOM的分解常数沿年均温(MAT)梯度呈显著下降变化，而互花米草入侵则延缓了这种变化趋势(变化斜率显著下降，P < 0.05)。土壤微生物呼吸熵与Q10在中纬度盐沼湿地生态系统出现峰值，微生物代谢策略的纬度变化模式可解释这一规律。气候变量对Q10表现出强烈的负作用，而土壤溶解性有机碳的比例与Q10的空间变化呈正相关。较高的土壤微生物多样性削弱了SOM分解的温度敏感性，这有利于湿地土壤有机碳的封存。不同滨海湿地类型对互花米草入侵的响应规律不一致。盐沼生态系统中SOM发生明显积累，而红树林系统则发生碳损失，互花米草入侵导致的SOM分解的纬度变化模式可以解释这一规律。本研究阐明了滨海湿地SOM分解的地理空间模式及其温度敏感性，并强调了气候、土壤和微生物群之间的相互作用是调控滨海湿地SOM响应植物入侵变化的重要驱动因素。
Habitat‐specific responses of soil organic matter decomposition to Spartina alterniflora invasion along China's coast
Zhang, Guangliang (author) / Bai, Junhong (author) / Tebbe, Christoph C. (author) / Huang, Laibin (author) / Jia, Jia (author) / Wang, Wei (author) / Wang, Xin (author) / Zhao, Qingqing (author) / Wen, Lixiang (author) / Kong, Fanlong (author)
2024-01-01
22 pages
Article (Journal)
Electronic Resource
English