Plant community controls on short-term ecosystem nitrogen retention.
Plant community controls on short-term ecosystem nitrogen retention.
复制标题
DOI：
10.1111/nph.13832
复制
发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Bardgett RD
中科院分区：
文献类型：
--
作者：
de Vries FT;Bardgett RD
氮（N）的保留是一个关键的生态系统功能，特别是在面对广泛的人为N富集，然而，我们的理解所涉及的机制是有限的。在这里，我们测试了温室条件下植物群落属性，包括植物功能性状的优势，多样性和范围的变化，影响氮的吸收和保留在温带草原。我们将15 N脉冲添加到草地植物群落中，以代表一系列群落加权平均植物性状、性状功能多样性和分歧以及物种丰富度，并测量植物和微生物对15 N的吸收以及15 N的淋失，作为植物-土壤系统中N保留的短期测试。根系生物量、草本植物丰富度和优势植物性状是植物-土壤系统中氮素存留的主要决定因素：根系生物量和草本植物丰富度越大，根系组织密度越低，植物对15 N的吸收越多，而比叶面积和根系组织密度越大，微生物对15 N的吸收越多。我们的研究结果为植物-土壤系统中N的短期命运提供了新的机制见解，并表明主导植物性状，而不是性状功能多样性，控制了植物-土壤系统中添加的N的命运。
Retention of nitrogen (N) is a critical ecosystem function, especially in the face of widespread anthropogenic N enrichment; however, our understanding of the mechanisms involved is limited. Here, we tested under glasshouse conditions how plant community attributes, including variations in the dominance, diversity and range of plant functional traits, influence N uptake and retention in temperate grassland. We added a pulse of 15N to grassland plant communities assembled to represent a range of community‐weighted mean plant traits, trait functional diversity and divergence, and species richness, and measured plant and microbial uptake of 15N, and leaching losses of 15N, as a short‐term test of N retention in the plant–soil system. Root biomass, herb abundance and dominant plant traits were the main determinants of N retention in the plant–soil system: greater root biomass and herb abundance, and lower root tissue density, increased plant 15N uptake, while higher specific leaf area and root tissue density increased microbial 15N uptake. Our results provide novel, mechanistic insight into the short‐term fate of N in the plant–soil system, and show that dominant plant traits, rather than trait functional diversity, control the fate of added N in the plant–soil system.