Influence of plant traits, soil microbial properties, and abiotic parameters on nitrogen turnover of grassland ecosystems
Influence of plant traits, soil microbial properties, and abiotic parameters on nitrogen turnover of grassland ecosystems
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DOI：
10.1002/ecs2.1448
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发表时间：
2016-11-01
期刊：
影响因子：
2.7
通讯作者：
Bardgett, Richard D.
中科院分区：
文献类型：
--
作者：
Legay, Nicolas;Lavorel, Sandra;Bardgett, Richard D.
虽然已知植物功能性状、微生物特性和非生物土壤参数之间的多重交互作用影响养分周转，但这些变量中每组变量的相对贡献却知之甚少。我们在一个多点中观实验中控制了草地植物功能成分和土壤氮素有效性，以量化它们对土壤氮素周转的相对影响。总体而言，根系特征、丛枝菌根定植、反硝化潜力以及N有效性和水分有效性最好地解释了所测量的生态系统属性的变化，特别是养分固定和植物生物量生产之间的权衡。它们的相对贡献随土壤氮素有效性的不同而变化。在相对贫氮土壤(10~20亩g·ng(-1)土壤)中，氮素周转主要受微生物特性和非生物土壤参数控制，而在相对富氮土壤(110~120亩g·g(-1)土壤)中，N周转主要受植物性状和微生物特性控制。这项试验有力地证明了植物和土壤微生物的功能特性及其与土壤氮素有效性的相互作用对草原土壤氮素周转的重要性。
Although it is known that multiple interactions among plant functional traits, microbial properties, and abiotic soil parameters influence the nutrient turnover, the relative contribution of each of these groups of variables is poorly understood. We manipulated grassland plant functional composition and soil nitrogen (N) availability in a multisite mesocosm experiment to quantify their relative effects on soil N turnover. Overall, root traits, arbuscular mycorrhizal colonization, denitrification potential, as well as N availability and water availability, best explained the variation in measured ecosystem properties, especially the trade-off between nutrient sequestration and plant biomass production. Their relative contributions varied with soil N availability. In relatively N-poor soils (10-20 mu g.N.g(-1) soil), N turnover was mainly controlled by microbial properties and abiotic soil parameters, whereas in the relatively N-rich soils (110-120 mu g.N.g(-1) soil), N turnover was mainly controlled by plant traits and microbial properties. This experiment is a strong demonstration of the importance of functional characteristics of both plants and soil microbes, and their interplay with soil N availability, for N turnover in grassland soils.