4.7 Article

Long-term grass mulching waste recycling and evaluation activation of dissolved organic carbon

期刊

CHEMOSPHERE
卷 287, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132454

关键词

Grass mulching model; Soil aggregate; Carbon sequestration; Three-dimensional fluorescence spectroscopy; Dissolved organic matter

资金

  1. Cyrus Tang Foundation
  2. National Natural Science Foundation of China (NSFC) [31570623]
  3. National Key Research and Development Program of China [2016YFD0201131]

向作者/读者索取更多资源

This study found that leguminous grass mulching has a significant impact on the distribution of soil aggregates and DOM content, especially increasing the proportion of macroaggregates and aggregates associated with DOC. Leguminous grass mulching also contributes to the increase in soil total nitrogen and three identified fluorescent components.
This study aimed to clarify that long-term leguminous grass mulching (crown vetch (CV) and white clover (WC)) and gramineous grass (orchardgrass (OG)) drive the distribution of soil aggregates and are associated with dissolved organic matter (DOM) components. Excitation emission spectroscopy and parallel factor analysis (EEM-PARAFAC) were used to evaluate the influence of different grass mulches among aggregates. The results indicated that legumes had a more significant impact on the distribution of aggregates and DOM content than gramineae grass mulching. Leguminous grass mulching significantly increased the proportion of macroaggre-gates >250 mu m (74.65%-83.50%) and aggregates associated with dissolved organic carbon (DOC), especially in microaggregates <250 mu m (172.27 mg kg(-1) to 391.55 mg kg(-1)). In addition, leguminous grass mulching (CV and WC) contributed more to the increase in soil total nitrogen (TN) and three identified fluorescent components (UVC humic-like, UVA humic-like and protein-like). The component of UVC humic-like relative abundance decreased (48.66%-36.57%), and the protein-like component increased (21.88%-36.50%) as the aggregate size decreased, but the DOM three compositions did not change. The DOM of macroaggregates had higher aroma-ticity and lower molecular weight than microaggregates, and the highest abundance of UVC humic-like component (54.52%) was found in the gramineous (OG) large macroaggregates, while the higher abundance of protein-like components (31.07%-36.50%) occurs in leguminous mulching (CV and WC) microaggregates. The results contribute to a further understanding of the dynamic process by which grass mulching mediates aggregate formation and DOM component transformation in semiarid apple orchards under grass waste management.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据