Increased microbial carbon use efficiency and turnover rate drive soil organic carbon storage in old-aged forest on the southeastern Tibetan Plateau

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE
Shenglan Ma, Wanze Zhu, Wenwu Wang, Xia Li, Zheliang Sheng, Wolfgang Wanek
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Abstract

It is widely accepted that old-aged forest can accumulate soil organic carbon (SOC). How microbial physiological traits respond to forest age and whether they drive SOC sequestration in old-aged forest remain elusive. Therefore, we compared the microbial C use efficiency (CUE), biomass turnover rate (rB), microbial biomass C (MBC) and necromass C (MNC) across soil profiles from middle and old-aged forest and evaluated how these microbial traits are related to SOC storage. The results revealed that both forests could accumulate SOC and old-aged forest supported higher SOC storage than middle-aged forest from 2005 to 2020. Moreover, SOC was concentrated on the surface soils of middle-aged forest, whereas it was more distributed across the deeper soil profile in old-aged forest. Compared with middle-aged forest, the O, A and B soil layers of old-aged forest presented increases in microbial CUE (17.8%, 36.9% and 25.0%, respectively), rB (43.7%, 39.7% and 10.8%, respectively), MBC (114.8%, 81.1% and 122.9%, respectively), and MNC content (47.0%, 22.2% and 21.6%, respectively). Random forest analysis suggested that SOC accumulation is controlled mainly by microbial physiological traits rather than other factors including environmental variables. Specifically, microbial CUE and turnover rates increased in old-aged forest, resulting in higher MBC and MNC contents, which in turn led to SOC accumulation. Moreover, the effects of plant and soil properties on SOC storage are regulated mainly by microbial-physiological parameters and the size of microbial C pools. Our findings provide valuable insights into the microbial mechanisms underlying SOC storage in old-aged forest.

Abstract Image

微生物碳利用效率和周转率的提高推动了青藏高原东南部古老森林的土壤有机碳储存
人们普遍认为,古老的森林可以积累土壤有机碳(SOC)。微生物的生理特征如何对森林年龄做出反应,以及它们是否驱动了老龄林中的土壤有机碳固存,仍然是一个未知数。因此,我们比较了中龄林和老龄林土壤剖面中的微生物碳利用效率(CUE)、生物量周转率(rB)、微生物生物量碳(MBC)和新生物量碳(MNC),并评估了这些微生物性状与 SOC 储量的关系。结果表明,两种森林都能积累 SOC,而且从 2005 年到 2020 年,老龄林的 SOC 储量高于中龄林。此外,SOC 主要集中在中龄林的表层土壤,而在老龄林中则更多地分布在深层土壤剖面上。与中龄林相比,老龄林的 O、A 和 B 土层的微生物 CUE(分别为 17.8%、36.9% 和 25.0%)、rB(分别为 43.7%、39.7% 和 10.8%)、MBC(分别为 114.8%、81.1% 和 122.9%)和 MNC 含量(分别为 47.0%、22.2% 和 21.6%)均有所增加。随机森林分析表明,SOC 的积累主要受微生物生理特性的控制,而非包括环境变量在内的其他因素。具体而言,老龄林中微生物的 CUE 和周转率增加,导致 MBC 和 MNC 含量增加,进而导致 SOC 积累。此外,植物和土壤特性对 SOC 储存的影响主要受微生物生理参数和微生物 C 池大小的调节。我们的研究结果为了解老龄林中 SOC 储存的微生物机制提供了宝贵的见解。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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