Different contributing processes in bacterial vs. fungal necromass affect soil carbon fractions during the plant residues transformation

Author:

Xue Zhijing1ORCID,Qu Tingting,Li Xiaoyun,Chen Qin,Zhou Zhengchao,Wang Baorong,Lv XiZhi

Affiliation:

1. Shaanxi Normal University

Abstract

Abstract Aims Recent research has suggested that microbial necromass has a disproportionate influence on soil organic C accumulation. But few field studies have followed the bacterial and fungal necromass vacations during plant residue decomposition. Methods We investigated in a 512-days culture experiment with a perennial C3 herb (St.B, S. bungeana) to trace the formations of muramic acid (MurA) vs. Glucosamine (GluN), and investigate the relationships between MurA, GluN and soil C fractions. Results The results showed that the bacteria community dominates the decomposition process due to soil pH (>7) and microbial metabolic C-, P-limitations. The dynamics of MurA changed from fluctuating variations to a significant increase. Bacterial necromass has been in a balance of accumulation and decomposition at early and middle periods. The entombing effect in the later stage resulted in bacterial necromass accumulation. While in the case of microbial metabolism limitation, GluN will lose its physicochemical protection and be degraded. Microorganisms regulate the turnover of POC, MAOC and MBC by microbial biomass and necromass. The utilization of soil C fractions is the direct cause of SOC decline, while microbial necromass only plays an indirect role. The priming effecting caused by one-time input of high C/N ratio plant residues leads to the absence of SOC accumulation in the short term. Conclusions With the synergistic effect of soil C fractions, the production of microbial biomass and the degradation of cellular residues maintain microbial stoichiometric homeostasis. In addition to soil pH, microbial biomass stoichiometry co-determines microbial necromass formation.

Publisher

Research Square Platform LLC

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3