High ecosystem multifunctionality under moderate grazing is associated with high plant but low bacterial diversity in a semi-arid steppe grassland
High ecosystem multifunctionality under moderate grazing is associated with high plant but low bacterial diversity in a semi-arid steppe grassland
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DOI：
10.1007/s11104-020-04430-6
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发表时间：
2020-01
期刊：
影响因子：
4.9
通讯作者：
Xinyu Wang;F. Li;Yanan Wang;Xin-min Liu;J. Cheng;Junzhen Zhang;T. Baoyin;R. Bardgett
中科院分区：
文献类型：
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作者：
Xinyu Wang;F. Li;Yanan Wang;Xin-min Liu;J. Cheng;Junzhen Zhang;T. Baoyin;R. Bardgett
目前对生物多样性与生态系统功能关系的研究主要集中在植物群落上。对地上和地下生物多样性组成部分对生态系统多功能性的个别和综合影响知之甚少。本研究的目的是探讨不同的管理制度如何通过改变植物和土壤微生物（细菌和真菌）多样性来影响多功能性。方法通过为期6年的试验，比较了内蒙古草原4种管理制度下碳、氮、磷循环和植物生产力的多功能和分离功能，并分析了这些功能与地上和地下生物多样性不同组成部分之间的关系。结果第二系统多功能性、养分循环速率和植物生产力在中等放牧强度下最高，在不放牧强度下最低。此外，在所有管理制度中，多功能性与植物多样性正相关，植物和土壤微生物多样性共同解释了多功能性方差的比例（62.5%），而不是单独的任何一个成分。生物多样性的不同组成部分与个体功能的关系存在差异：植物多样性与碳、氮循环呈正相关，细菌多样性与磷循环和植物生产力呈负相关。结论适度放牧在生物多样性保护和生态系统多功能方面的效果优于刈割和停牧。可持续放牧管理是保护地上和地下生物多样性和增强多种生态系统功能交付的可行策略。
AimsCurrent studies on the relationship between biodiversity and ecosystem functioning have mostly focused on plant communities. Less is known about the individual and combined effects of biodiversity components above-and-below-ground on ecosystem multifunctionality. The aim of this study was to explore how different management regimes influence multifunctionality via modification of both plant and soil microbial (bacterial and fungal) diversity.MethodsWe used a 6-year experiment in Inner Mongolian grassland to compare multifunctionality and separate functions related to the C, N, P cycles and plant productivity under four management regimes and examine relationships between these functions and different components of biodiversity, both above- and belowground.ResultsEcosystem multifunctionality and the rates of nutrient cycling and plant productivity, were greatest under moderate grazing intensity, and lowest under no grazing. Further, across all management regimes, multifunctionality was positively related to plant diversity, and plant and soil microbial diversity combined explained a much greater (62.5%) proportion of variance in multifunctionality than that did either component alone. Different components of biodiversity showed contrasting relationships with individual functions: plant diversity was positively related to C and N cycling, whereas bacterial diversity was negatively related to P cycling and plant productivity.ConclusionsModerate grazing has better outcomes for biodiversity conservation and ecosystem multifunctionality than mowing and cessation of grazing. Sustainable grazing management is a viable strategy to conserve both above- and belowground biodiversity and enhance the delivery of multiple ecosystem functions.