Microbial phosphorus demand affects carbon-degrading potential under long-term nitrogen addition in a subtropical forest

IF 4.8 2区 农林科学 Q1 SOIL SCIENCE
Linna Chen , Quanxin Zeng , Qiufang Zhang , Biao Zhu , Yuexin Fan , Xiaochun Yuan , Yuehmin Chen
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Abstract

Tropical and subtropical forests store over one-third of global soil carbon (C), substantially influencing global C-climate feedback. However, whether low phosphorus (P) availability and microbial P deficiency in these ecosystems limit soil organic C (SOC) sequestration remains poorly understood. Here, we investigated the effects of 8–9 years of nitrogen (N) addition on SOC content and its microbial mechanisms in a subtropical Moso bamboo forest. We observed that long-term N addition reduced both microbial necromass C (MNC) and SOC contents, while it increased microbial P demand as indicated by the changes in P-cycling genes and phosphatase activity. Genes and enzymes related to P-cycling were identified as the important drivers of SOC content. A structural equation model further showed that N addition-induced higher microbial P demand negatively affected SOC content. This effect was both direct and indirect, the latter via promoting microbial C demand, which subsequently negatively affected MNC and SOC contents. Altogether, our findings suggest that microbial P deficiency is detrimental to SOC storage, offering novel perspectives on the coupling of soil C and P cycling via microbial mechanisms.
亚热带森林微生物磷需求影响长期加氮条件下的碳降解潜力
热带和亚热带森林储存了全球三分之一以上的土壤碳(C),极大地影响了全球碳-气候反馈。然而,这些生态系统的低磷有效性和微生物磷缺乏是否限制了土壤有机碳(SOC)的固存,目前尚不清楚。研究了8 ~ 9年氮素添加对亚热带毛梭竹林土壤有机碳含量的影响及其微生物机制。结果表明,长期施氮降低了微生物坏死团C (MNC)和有机碳(SOC)含量,但增加了微生物对磷的需求,这体现在磷循环基因和磷酸酶活性的变化上。与磷循环有关的基因和酶被确定为土壤有机碳含量的重要驱动因素。结构方程模型进一步表明,氮添加导致微生物P需求增加,对有机碳含量产生负向影响。这种影响既有直接的,也有间接的,后者通过促进微生物对碳的需求,从而对MNC和SOC含量产生负面影响。总之,我们的研究结果表明,微生物磷缺乏不利于有机碳的储存,为通过微生物机制耦合土壤C和P循环提供了新的视角。
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来源期刊
Applied Soil Ecology
Applied Soil Ecology 农林科学-土壤科学
CiteScore
9.70
自引率
4.20%
发文量
363
审稿时长
5.3 months
期刊介绍: Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.
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