Impact of poplar on soil organic matter quality and microbial communities in arable soils
Impact of poplar on soil organic matter quality and microbial communities in arable soils
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DOI：
10.17221/548/2012-pse
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发表时间：
2013-01-01
影响因子：
2.4
通讯作者：
Leinweber, P.
中科院分区：
文献类型：
--
作者：
Baum, C.;Eckhardt, K. -U.;Leinweber, P.
杨树是一种很有前途的生物能源作物。本研究旨在评估土壤有机质（SOM）质量和可行的微生物群落下6年生白杨（杨maximowiczii）和小麦（小麦）在德国中部的一个试验点。SOM分子组成和稳定性测定裂解场离子化质谱（Py-FIMS）。根据微生物磷脂脂肪酸（PLFA）谱评估了微生物群落。Py-FIMS和PLFA同意在SOM质量和相关的微生物群落中显示作物特异性差异。较高比例的碳水化合物，长链脂肪酸，甾醇和木栓质的含氮化合物在白杨下比小麦下的费用与较低浓度的微生物PLFA的有机物。杨树土壤有机质中真菌与细菌的比例（f/B）高于小麦，而革兰氏阳性菌与革兰氏阴性菌的比例低于小麦，丛枝菌根真菌的生物量也低于小麦。较低的N-和增加的C-有效性的SOM促进真菌与细菌的殖民化，增加了SOM的稳定性较低的分解性，并导致SOM积累下杨树。
Poplars grown in short rotation coppice on agricultural land are a promising bioenergy crop. This study aimed to evaluate the soil organic matter (SOM) quality and viable microbial consortium under six-years-old poplar (Populus maximowiczii) and under wheat (Triticum aestivum) at a test site in central Germany. The SOM molecular composition and stability was determined by pyrolysis-field ionization mass spectrometry (Py-FIMS). The microbial consortium was assessed in terms of microbial phospholipid fatty acid (PLFA) profiles. Py-FIMS and the PLFAs agreed in showing crop-specific differences in the SOM quality and in the associated microbial communities. Higher proportions of carbohydrates, long-chained fatty acids, sterols and suberins at the expense of N-containing compounds under poplar than under wheat were associated with lower concentrations of microbial PLFAs in the organic matter. A higher ratio of total fungal to bacterial (f/b) PLFAs, a lower ratio of Gram-positive to Gram-negative bacterial PLFAs and lower biomass of arbuscular mycorrhizal fungi in the organic matter were revealed under poplar than under wheat. Lower N- and increased C-availability in the SOM promoted fungal vs. bacterial colonization, increased the SOM stability by a lower decomposability and caused SOM accumulation under poplar.