Dynamics of aggregate stability and biological binding agents during decomposition of organic materials
Dynamics of aggregate stability and biological binding agents during decomposition of organic materials
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DOI：
10.1111/j.1365-2389.2006.00833.x
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发表时间：
2007-02-01
影响因子：
4.2
通讯作者：
Leterme, P.
中科院分区：
文献类型：
--
作者：
Abiven, S.;Menasseri, S.;Leterme, P.
不同结合机制和相关生物结合剂对聚集体稳定性的相对重要性仍不清楚。本研究的目的是评估各种团聚体粘合剂的作用过程中的花椰菜残体，小麦秸秆，牛粪和家禽木质堆肥的分解。我们测量了团聚体的稳定性，热水可提取的多糖，C矿化，真菌和微生物的生物量动态在一个修订的粉壤土，在控制条件下。土壤团聚体的稳定性测定使用三种方法，包括快速润湿，缓慢润湿和机械破碎。聚集体的稳定性，以缓慢润湿遵循相同的动态C矿化，以及相关的花椰菜残基和小麦秸秆的多糖含量。这种关系是在协议的假设，即快速微生物诱导的改善聚集体的稳定性，以下新鲜的有机残留物添加至少部分涉及不稳定的多糖。在其他两种类型的稳定性的瞬时增加是没有直接关系的C矿化动力学，似乎是真菌菌丝长度的影响。真菌将提供对机械分解和熟化的抗性。生物粘合剂的动力学行为仅部分地由有机材料的初始质量来解释，如由货车索斯特近端分馏所表征的。
The relative importance of different binding mechanisms and associated biological binding agents on aggregate stability is still unclear. The aim of this study was to evaluate the role of various aggregate binding agents during the decomposition of cauliflower residues, wheat straw, cattle manure and poultry woody compost. We measured aggregate stability, hot-water extractable polysaccharide, C mineralization, fungal and microbial biomass dynamics in an amended silt loam soil, under controlled conditions. Soil aggregate stability was measured using three methods involving fast wetting, slow wetting and mechanical breakdown. Aggregate stability to slow wetting followed the same dynamics as C mineralization and was well correlated with polysaccharide content for cauliflower residues and wheat straw. This relationship is in agreement with the hypothesis that the rapid microbially induced improvement in aggregate stability that follows fresh organic residue additions at least partly involves labile polysaccharides. The transient increase in the two other types of stability was not directly related to C mineralization dynamics and seemed to be influenced by fungal hyphal length. Fungi would provide resistance to mechanical breakdown and slaking. The dynamic behaviour of biological binding agents was only partly explained by the initial quality of the organic materials, as characterized by Van Soest proximal fractionation.