Abstract The changes of chemical structure and decomposer community during straw degradation have been inconsistent in previous reports, showing either convergence or divergence of chemical structures or microbial communities among different straw types. Hence the strength of their relationship remains unclear. Here, we directly measured the chemical structures and bacterial and fungal communities of wheat (Triticum aestivum L.) and maize (Zea mays L.) residues after four-year decomposition in three Calcaric Fluvisols that varied in soil textures. Separation of the chemical structures among the six soil-straw combinations (two straw types × three soil textures) were generally coupled with trends in the communities of bacterial and fungal decomposers, but the nature of their coupling differed. In the sand soil, soil texture was the central feature that shaped bacterial and fungal communities for both straw types, driving in turn the convergence of chemical structures of both decomposing straws. In contrast, in the sandy loam and silty clay soils, straw type was the primary regulator of the colonizing bacterial and fungal communities, which resulted in the divergence of chemical structures according to straw type.

中文翻译：

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土壤质地和秸秆类型通过调节细菌和真菌群落在四年分解过程中调节残留物的化学结构

摘要 秸秆降解过程中化学结构和分解者群落的变化与以往报道不一致，不同秸秆类型之间化学结构或微生物群落或趋同或趋异。因此，他们的关系强度尚不清楚。在这里，我们直接测量了小麦 (Triticum aestivum L.) 和玉米 (Zea mays L.) 在土壤质地不同的三种钙质流溶胶中分解四年后的化学结构以及细菌和真菌群落。六种土壤-秸秆组合（两种秸秆类型×三种土壤质地）之间化学结构的分离通常与细菌和真菌分解者群落的趋势相耦合，但它们的耦合性质不同。在沙土中，土壤质地是塑造两种秸秆细菌和真菌群落的核心特征，反过来又推动了两种分解秸秆的化学结构的融合。相比之下，在砂质壤土和粉质粘土中，秸秆类型是细菌和真菌群落定殖的主要调节因子，导致不同秸秆类型的化学结构存在差异。