Biocrusts alleviate the aggravating C limitation in microbial respiration with increasing aridity

表土 底土 土壤呼吸 微生物种群生物学 环境科学 干旱 自养 呼吸 环境化学 土壤科学 生态学 植物 化学 土壤水分 生物 细菌 遗传学
作者
Su Yan,Gang Huang,Jie Liu
出处
期刊:Geoderma [Elsevier BV]
卷期号:429: 116210-116210 被引量:2
标识
DOI:10.1016/j.geoderma.2022.116210
摘要

Autotrophs (cyanobacteria and mosses) in biocrusts promote soil organic C content and determine soil C dynamics in drylands. However, whether the increased C availability would mitigate microbial C limitation is unknown. The microbial respiration under control without C addition and two forms of C addition (glucose or cellulose) was measured using the topsoil (0–2 cm) and subsoil (2–5 cm) from bare ground lacking biocrusts, cyanobacteria-crusted soil, and moss-crusted soil collected in 36 sites along an aridity gradient in northern China. Microbial C limitation was further qualified as microbial respiration under glucose or cellulose addition divided by that without C addition. Finally, the magnitude of alleviated C limitation by biocrusts and the driving forces were evaluated using the relative effect size via comparing microbial C limitation in biocrusted topsoil and subsoil. Microbial respiration increased significantly under both two types of C addition, and the increase of microbial respiration was consistently stronger in glucose addition than cellulose addition, suggesting the universal microbial C limitation in northern China's drylands. Further, microbial C limitation was strongest in bare ground, and it was significantly lower in cyanobacteria-crusted topsoil and the lowest in moss-crusted topsoil. More importantly, the magnitude of alleviated microbial C limitation increased with increasing aridity. Structural equation modeling demonstrates that the alleviated microbial C limitation was mediated by the direct effect of Chl a concentration of autotrophs in biocrusts and aridity, as well as their indirect effects via increasing soil organic C content and microbial metabolic quotient and decreasing the ratio of fungi to bacterial PLFAs. Our findings provide strong evidence that biocrusts alleviate the aggravating C limitation in microbial respiration with increasing aridity.
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