The added value of including key microbial traits to determine nitrogen-related ecosystem services in managed grasslands
The added value of including key microbial traits to determine nitrogen-related ecosystem services in managed grasslands
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DOI：
10.1111/1365-2664.13010
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发表时间：
2018
影响因子：
5.7
通讯作者：
T. Pommier;Amélie A. M. Cantarel;K. Grigulis;S. Lavorel;N. Legay;Catherine Baxendale;R. Bardgett;M. Bahn;F. Poly;J. Clément
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文献类型：
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作者：
T. Pommier;Amélie A. M. Cantarel;K. Grigulis;S. Lavorel;N. Legay;Catherine Baxendale;R. Bardgett;M. Bahn;F. Poly;J. Clément
尽管土壤微生物在养分循环和植物生长中发挥着重要作用，但由于难以评估其多样性和功能，土壤微生物在生态系统服务（ES）研究中通常被忽视。然而，为了克服这些障碍，新的概念方法和现代工具现在提供了一种手段来评估微生物在评价ES中的作用。在人工草地中，土壤微生物是提供氮相关ES的核心，如维持土壤肥力和保持氮的矿物形式。在这里，我们应用最先进的技术，在微生物生态学和植物功能生态学，揭示N相关的细菌功能群，重要的植物功能性状，环境因素和三个代理的土壤肥力的维护和潜在的N-淋溶在欧洲三个地区的管理草原之间的内在联系。通过构建定义明确的结构方程模型，我们发现，包括关键微生物性状平均改善了ES指标总方差的50%以上，即铵（数学公式）或硝酸盐（数学公式）淋溶和土壤有机质含量。当考虑这些ES代理与特定的微生物性状的直接关系时，出现了地理差异：硝酸盐淋溶与硝化的最大速率呈正相关，除了在奥地利的网站和潜在的淋溶数学公式-N呈负相关的真菌/细菌的比例，除了法国网站。合成与应用。将土壤微生物功能性状纳入与氮相关的草地生态系统服务功能评价中，对于理解草地生态系统的可持续管理具有直接的贡献。本研究的基本方面表明，将土壤微生物成分纳入草原管理可以增强此类以草为基础的农业生态系统的可持续性。
Despite playing central roles in nutrient cycles and plant growth, soil microbes are generally neglected in the study of ecosystem services (ES), due to difficulties to assess their diversity and functioning. However, to overcome these hurdles, new conceptual approaches and modern tools now provide a means to assess the role of micro-organisms in the evaluation of ES. In managed grasslands, soil microbes are central in providing nitrogen (N)-related ES such as maintenance of soil fertility and retention of mineral forms of N. Here, we applied state-of-the-art techniques in microbial ecology and plant functional ecology to uncover the intrinsic link between N-related bacterial functional groups, important plant functional traits, environmental factors and three proxies of maintenance of soil fertility and potential for N-leaching across managed grasslands in three regions of Europe. By constructing well-defined structural equation modelling, we showed that including key microbial traits improve on average more than >50% of the total variances of ES proxies, that is, ammonium (math formula) or nitrate (math formula) leaching, and soil organic matter content. Geographic differences arose when considering the direct relationships of these ES proxies with specific microbial traits: nitrate leaching was positively correlated to the maximum rate of nitrification, except in the Austrian site and potentially leached math formula–N was negatively correlated to the fungi/bacteria ratio, with the exception of the French site. Synthesis and applications. The integration of soil microbial functional traits in the assessment of nitrogen-related grassland ecosystem services has direct contributions for understanding sustainable management of grassland ecosystems. The fundamental aspects of this study suggest that integrating a soil microbial component in grassland management may enhance sustainability of such grass-based agroecosystems.