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Plant residue-derived hydrophilic and hydrophobic fractions contribute to the formation of soil organic matter

文献类型： 外文期刊

作者： Zheng, Xiaodong 1 ; Liang, Chengming 1 ; Chen, Xiangbi 1 ; Hu, Yajun 1 ; Qiu, Husen 1 ; Xia, Yinhang 1 ; Liu, Zhongzhe 1 ;

作者机构： 1.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Guangdong, Peoples R China

3.Univ Kassel, Dept Environm Chem, D-37213 Witzenhausen, Germany

关键词： Substrate solubility; Microbial biomarkers; Fungal and bacterial residues; Soil management; Organic matter

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2021 年 57 卷 7 期

页码：

收录情况： SCI

摘要： The fate of hydrophilic, hydrophobic, and insoluble fractions extracted from C-13-labelled maize straw and their use for the formation of bacterial and fungal-derived amino sugars (AS) were monitored during a 40-day incubation of upland and paddy soils. The highest sequestration of C in the AS pool was present in the hydrophilic fraction in both soils (1.1-1.4% of input C). Bacterial community in upland soil utilized the hydrophilic fraction the most for the formation of AS, whereas fungi used the hydrophobic fraction, suggesting that bacteria and fungi have different substrate preference. In contrast, fungi used similar portions of all fractions for AS formation in the paddy soil, which could be a substrate utilization strategy under anoxic conditions. Sequestration of microbial-derived C, formed from the added fractions, was lower in paddy than in upland soils (0.7-1.1% vs. 1.2-1.4%), while total AS content showed the opposite trend (493-509 mg kg(-1) in paddy vs. 387-405 mg kg(-1) in upland soils). This was attributed to the 1.5 times lower microbial activity in paddy than in upland soils based on the relative incorporation of C-13 into total MBC. Thus, sequestration of microbial-derived C from various organic C sources is closely related to substrate quality, but soil management and its properties modulate the microbial utilization of substances with various hydrophobicity.

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