Variation of intra-aggregate organic carbon affects aggregate formation and stability during organic manure fertilization in a fluvo-aquic soil

文献类型： 外文期刊

第一作者： Wen, Yunjie

作者： Wen, Yunjie;Bai, Lingyu;Wang, Yanan;Su, Shiming;Wu, Cuixia;Zeng, Xibai;Wen, Yunjie;Wang, Qi;Lv, Jialong;Tang, Yuefeng;Wen, Jiong;Bai, Lingyu;Wang, Yanan;Su, Shiming;Wu, Cuixia;Zeng, Xibai

作者机构：

关键词： manure; microorganism; organic carbon; Soil aggregate; stability mechanism

期刊名称：SOIL USE AND MANAGEMENT （ 影响因子：2.95； 五年影响因子：3.109 ）

ISSN： 0266-0032

年卷期： 2021 年 37 卷 1 期

页码：

收录情况： SCI

摘要： The aggregate formation and stability are controlled by the dynamics of soil organic matters (SOM), but how it is related to SOM chemical composition within different-sized aggregates is largely unknown during manure fertilization. In this study, the variations of intra-aggregate organic carbon (OC), including intra-particulate organic matter (iPOM) and mineral-associated organic matter, were quantitatively and qualitatively analysed, and then, their effects on aggregate formation and stability were assessed under four treatments: control (CK), mineral fertilizer (NPK), reduced manure (30%M) and manure fertilizers (M). Manure application (M) significantly increased macroaggregate proportion, mean weight diameter (MWD), and OC contents within different-sized aggregates compared to CK, NPK, and 30%M. The OC accumulation of macroaggregate in M was attributed to OC content increase in silt plus clay subfraction rather than iPOM with more labile organic groups; oppositely, in microaggregate it was located in the relatively stable fine iPOM. The macroaggregate formation and stability were controlled by the fine iPOM within macroaggregates, whose abundant polysaccharide-C and aliphatic-C after manure fertilization advanced the microbial growth except for Gram-positive bacteria, which further promoted macroaggregate formation and stability. The free silt plus clay fraction also affected macroaggregate formation and stability, and its polysaccharide-C derived from microorganisms or decomposing SOM was positively associated with MWD and macroaggregate proportion. Because polysaccharide-C can be easily associated with mineral particles, further improving micro- or macroaggregation. We conclude that continuous manure fertilization could increase labile SOM accumulation within aggregates and then facilitate microbial growth, which collectively are responsible for aggregate formation and stabilization.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序