Vegetation composition promotes carbon and nitrogen storage in model grassland communities of contrasting soil fertility
Vegetation composition promotes carbon and nitrogen storage in model grassland communities of contrasting soil fertility
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DOI：
10.1111/j.1365-2745.2009.01536.x
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发表时间：
2009-09-01
影响因子：
5.5
通讯作者：
Bardgett, Richard D.
中科院分区：
文献类型：
--
作者：
De Deyn, Gerlinde B.;Quirk, Helen;Bardgett, Richard D.
植物功能群和植物物种多样性对维持初级生产力的作用已被广泛研究。然而，很少有研究同时探讨植物物种和功能群丰富度和组成对其他生态系统服务的潜在效益及其对资源可用性的依赖性。本文研究了不同肥力土壤中植物物种和功能群丰富度和组成对植被碳（C）和氮（N）储量的影响。土壤和土壤微生物以及CO（2）交换和通过淋溶从土壤中损失的C和N。我们建立了植物群落从一个池的6个中营养型草地物种属于三个功能组（C3草，杂类草和豆科植物）在两种土壤的对比肥力。我们用一个，两个，三个或六个物种和一个，两个或三个功能groups.2年后，植被C和N和土壤微生物生物量更大，在更肥沃的土壤，并增加了显着的植物物种和功能组丰富度的数量。植物多样性对植被C和N的正效应与减少水和N的淋溶损失（尤其是杂类草）和增加生态系统CO2净交换速率相一致。2年后，土壤C和N库不受植物种类或功能群丰富度本身的影响。但由于豆科植物百脉根和三叶草的存在和生物量的增加，总的来说，我们的研究结果表明，在植物物种和功能组丰富度的变化影响的存储和损失的C和N在模型草原社区，但这些反应与某些植物物种的存在和生物量，特别是固氮和杂类草。因此，我们的研究结果表明，从特定的功能组的物种的共存是至关重要的维护多功能方面的C和N存储在草原。
P>The benefits of plant functional group and plant species diversity for sustaining primary productivity have been extensively studied. However, few studies have simultaneously explored potential benefits of plant species and functional group richness and composition for the delivery of other ecosystem services and their dependency on resource availability.Here, we investigated in soils of different fertility the effects of plant species and functional group richness and composition on carbon (C) and nitrogen (N) stocks in vegetation, soil and soil microbes and on CO(2) exchange and the loss of C and N from soil through leaching. We established plant communities from a pool of six mesotrophic grassland species belonging to one of three functional groups (C3 grasses, forbs and legumes) in two soils of contrasting fertility. We varied species richness using one, two, three or six species and one, two or three functional groups.After 2 years, vegetation C and N and soil microbial biomass were greater in the more fertile soil and increased significantly with greater numbers of plant species and functional group richness. The positive effect of plant diversity on vegetation C and N coincided with reduced loss of water and N through leaching, which was especially governed by forbs, and increased rates of net ecosystem CO(2) exchange.Soil C and N pools were not affected by the number of plant species or functional group richness per se after 2 years, but were enhanced by the presence and biomass of the legumes Lotus corniculatus and Trifolium repens.Synthesis. Collectively, our findings indicate that changes in plant species and functional group richness influence the storage and loss of both C and N in model grassland communities but that these responses are related to the presence and biomass of certain plant species, notably N fixers and forbs. Our results therefore suggest that the co-occurrence of species from specific functional groups is crucial for the maintenance of multifunctionality with respect to C and N storage in grasslands.