What plant functional traits can reduce nitrous oxide emissions from intensively managed grasslands?
What plant functional traits can reduce nitrous oxide emissions from intensively managed grasslands?
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DOI：
10.1111/gcb.13827
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发表时间：
2018-01-01
影响因子：
11.6
通讯作者：
De Deyn, Gerlinde B.
中科院分区：
文献类型：
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作者：
Abalos, Diego;van Groenigen, Jan Willem;De Deyn, Gerlinde B.
植物种类对天然草地和管理草地的氮素循环起着主导作用。尽管在接受大量外部N输入的集约化管理系统中，强有力的温室气体一氧化二氮(N2O)的排放是这个循环的关键组成部分，但植物种类和N2O排放之间的机械关系尚未建立。在这里，我们使用植物功能性状方法来研究植物种类策略与土壤N2O排放之间的关系。与保守策略的物种相比，当土壤中氮素充足时，具有获取性策略的物种具有更高的氮素吸收，但当土壤氮素有限时，也会引发氮素矿化。因此，我们假设：(1)与保守物种相比，具有获得性特征的物种在高氮添加后减少了N2O的排放；(2)在没有高N添加的情况下，具有保守特征的物种的N2O排放量低于获得性植物。这是在温室实验中进行的，使用了六种不同地上和地下特征的草的单一栽培，这些草生长在土壤氮素有效性的梯度上。我们发现，在所有氮素有效性水平上，获得性物种减少了N2O的排放，产生了更高的生物量，并表现出更大的氮素吸收。因此，获得型物种单位吸氮量的N2O排放量比保守型物种低87%(p
Plant species exert a dominant control over the nitrogen (N) cycle of natural and managed grasslands. Although in intensively managed systems that receive large external N inputs the emission of the potent greenhouse gas nitrous oxide (N2O) is a crucial component of this cycle, a mechanistic relationship between plant species and N2O emissions has not yet been established. Here we use a plant functional trait approach to study the relation between plant species strategies and N2O emissions from soils. Compared to species with conservative strategies, species with acquisitive strategies have higher N uptake when there is ample N in the soil, but also trigger N mineralization when soil N is limiting. Therefore, we hypothesized that (1) compared to conservative species, species with acquisitive traits reduce N2O emissions after a high N addition; and (2) species with conservative traits have lower N2O emissions than acquisitive plants if there is no high N addition. This was tested in a greenhouse experiment using monocultures of six grass species with differing above-and below-ground traits, growing across a gradient of soil N availability. We found that acquisitive species reduced N2O emissions at all levels of N availability, produced higher biomass and showed larger N uptake. As such, acquisitive species had 87% lower N2O emissions per unit of N uptake than conservative species (p