Amino acid dynamics across a grassland altitudinal gradient
Amino acid dynamics across a grassland altitudinal gradient
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DOI：
10.1016/j.soilbio.2014.05.015
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发表时间：
2014-09
影响因子：
9.7
通讯作者：
M. Farrell;L. Macdonald;P. Hill;S. D. Wanniarachchi;J. Farrar;R. Bardgett;Davey L. Jones
中科院分区：
文献类型：
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作者：
M. Farrell;L. Macdonald;P. Hill;S. D. Wanniarachchi;J. Farrar;R. Bardgett;Davey L. Jones
氨基酸（AA）已成为越来越多与土壤中氮通量相关的研究的焦点。我们使用跨越海拔梯度的五个温带草原地点来建立土壤特性与单个AA池的大小及其矿化率之间的关系。对土壤和土壤溶液化学、植被和微生物群落结构以及游离氨基酸和肽氨基酸的固定浓度进行了量化。 AA 的矿化普遍较快 (t1/2< 5 h)。我们发现常设 AA 池化学成分与 AA 矿化速率之间没有关系。相反，土壤 pH 值、微生物总生物量以及植被群落结构与 AA 周转率的相关性最强，凸显了 pH 对土壤微生物功能的调节作用。
Amino acids (AAs) have been the focus of an increasing amount of research in relation to nitrogen fluxes in soils. We use five temperate grassland sites across an altitudinal gradient to establish relationships between soil properties and the size of individual AA pools and their mineralisation rate. Soil and soil solution chemistry, vegetation and microbial community structure, and standing concentrations of free- and peptide-AAs, were quantified. Mineralisation of AAs was universally rapid (t1/2< 5 h). We found no relationship between standing AA pool chemistry and rate of AA mineralisation. Instead, soil pH and total microbial biomass, and vegetation community structure were most strongly related to AA turnover rate, highlighting the regulatory role of pH on soil microbial function.