Fate of microbial residues during litter decomposition as affected by minerals
Fate of microbial residues during litter decomposition as affected by minerals
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DOI：
10.1097/00010694-200109000-00003
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发表时间：
2001-09-01
期刊：
影响因子：
--
通讯作者：
Zech, W
中科院分区：
文献类型：
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作者：
Amelung, W;Miltner, A;Zech, W
矿物质可以通过直接的化学和物理相互作用或通过对土壤微生物群落的抑制作用来保护有机物质免受微生物腐烂。为了澄清矿物质对有机物循环的微生物的影响，我们使用氨基糖作为示踪剂的C和N在死亡的微生物细胞后，0，15，29，90，239，和498天的孵育的山毛榉叶凋落物与石英砂，氧化铁，氢氧化铝，或氧化锰混合。未添加任何矿物质相的山毛榉落叶被用作对照。结果表明，随着凋落物分解的进行，氨基糖含量逐渐增加。氨基葡萄糖与胞壁酸和氨基葡萄糖与半乳糖胺的比率降低表明，随着孵育时间的增加，细菌产物相对于真菌细胞积累得越来越多。由于锰氧化物的存在促进了植物来源的C的损失，微生物来源的氨基糖C比其他处理有更明显的选择性积累。氢氧化铝和氧化铁抑制细菌氨基糖的合成的两个因素。这导致了较低的氨基糖C比例。与其他治疗方法相比。因此，氨基糖C的比例是敏感的增加氨基糖的合成和C矿化率。相比之下，氨基糖N比例不受任何矿物质添加的影响。因此，仅仅存在矿物质并不影响N通过氨基糖池的循环，但矿物质。改变了细菌和真菌残留物中N的相对比例。
Minerals may protect organic matter against microbial decay, either by direct chemical and physical interactions or by inhibitory effects on the soil microbial community. To clarify the effects of minerals on organic matter cycling by microorganisms, we used amino sugars as tracers for C and N in dead microbial cells after 0, 15, 29, 90, 239, and 498 days of incubation of beech leaf litter mixed with quartz sand, Fe oxide, Al hydroxide, or Mn oxide. Beech leaf litter without addition of any mineral phases was used as the control. The results show that amino sugar concentrations increased as litter decomposition proceeded. Decreasing ratios of glucosamine to muramic, acid and of glucosamine to galactosamine indicated that bacterial products accumulated increasingly relative to fungal cells with increasing incubation time. As the presence of Mn oxide promoted losses of plant-derived C, there was a more pronounced selective accumulation of the microbial-derived amino sugar C than in the other treatments. Aluminium hydroxide and Fe oxide inhibited synthesis of bacterial amino sugars by a factor of two. This resulted in lower amino sugar C proportions. compared with the other treatments. Consequently, the amino sugar C proportions were sensitive to both increasing amino sugar synthesis and C mineralization rates. In contrast, the amino sugar N proportions were not affected by any mineral additions. Thus, the mere presence of minerals did not affect the cycling of N through the, amino sugar pool, but minerals. altered the relative proportions of N sequestered within residues of bacteria and fungi.