Influence of thinning on carbon storage mediated by soil physicochemical properties and microbial community composition in large Chinese fir timber plantation

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Carbon Balance and Management Pub Date : 2024-09-03 DOI:10.1186/s13021-024-00269-x

Lei Huang, Yunchao Zhou

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Abstract

Background

Thinning practices are useful measures in forest management and play an essential role in maintaining ecological stability. However, the effects of thinning on the soil properties and microbial community in large Chinese fir timber plantations remain unknown. The purpose of this study was to investigate the changes in soil physicochemical properties and microbial community composition in topsoil (0–20 cm) under six different intensities (i.e., 300 (R300), 450 (R450), 600 (R600), 750 (R750) and 900 (R900) trees per hectare and 1650 (R1650) as a control) in a large Chinese fir timber plantation.

Results

Compared with the CK treatment, thinning significantly altered the contents of soil organic carbon (SOC) and its fractions but not in a linear fashion; these indicators were highest in R900. In addition, thinning did not significantly affect the soil microbial community diversity indices but significantly affected the relative abundance of the core microbial community. Proteobacteria, Acidobacteria, and Actinobacteria were the dominant bacterial phyla; the relative abundances of Proteobacteria and Acidobacteria were highest in R900, and that of Actinobacteria was lowest in R900. The dominant fungal phyla were Ascomycota, Basidiomycota and Mucoromycota; the relative abundance of Ascomycota was lowest in R900, and that of Mucoromycota was highest in R900. The fungal microbial community composition was more sensitive than the bacterial community composition. The activity of the carbon-cycling genes was not linearly correlated with thinning, and the abundance of C-cycle genes was highest in R900.

Conclusions

These findings are important because they show that SOC and its fractions and the abundance of the soil microorganism community in large Chinese fir timber plantations can be significantly altered by thinning, thus affecting the capacity for carbon storage. These results may advance our understanding of how the density of large timber plantations could be modified to promote soil carbon storage.

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疏伐对大型冷杉人工林土壤理化性质和微生物群落组成介导的碳储存的影响

背景：疏伐是森林管理的有效措施，在维护生态稳定方面发挥着重要作用。然而，疏伐对大型杉木人工林土壤特性和微生物群落的影响仍然未知。本研究的目的是调查大型冷杉人工林中六种不同疏伐强度（即每公顷 300 株（R300）、450 株（R450）、600 株（R600）、750 株（R750）和 900 株（R900），以及 1650 株（R1650）作为对照）下表土（0-20 厘米）的土壤理化性质和微生物群落组成的变化：与 CK 处理相比，疏伐显著改变了土壤有机碳（SOC）及其组分的含量，但不是以线性方式改变的；这些指标在 R900 处理中最高。此外，稀植对土壤微生物群落多样性指数没有明显影响，但对核心微生物群落的相对丰度有明显影响。蛋白质细菌、酸性细菌和放线菌是主要的细菌门；蛋白质细菌和酸性细菌的相对丰度在 R900 中最高，放线菌的相对丰度在 R900 中最低。主要真菌门为子囊菌门、担子菌门和粘菌门；子囊菌门的相对丰度在 R900 中最低，粘菌门的相对丰度在 R900 中最高。真菌微生物群落组成比细菌群落组成更为敏感。碳循环基因的活性与稀疏程度不呈线性相关，而碳循环基因的丰度在 R900 中最高：这些发现非常重要，因为它们表明，疏伐会显著改变大型冷杉人工林中的 SOC 及其组分以及土壤微生物群落的丰度，从而影响碳储存能力。这些结果有助于我们理解如何改变大型木材种植园的密度以促进土壤碳储存。

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来源期刊

Carbon Balance and Management Environmental Science-Management, Monitoring, Policy and Law

CiteScore

7.60

自引率

0.00%

发文量

审稿时长

14 weeks

期刊介绍： Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle. The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community. This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.