Negative responses of terrestrial nitrogen fixation to nitrogen addition weaken across increased soil organic carbon levels

重氮 氮气 固氮 环境化学 土壤碳 固定(群体遗传学) 陆地生态系统 固碳 碳循环 化学 生态学 生态系统 生物 土壤水分 二氧化碳 生物化学 基因 有机化学
作者
Mianhai Zheng,Meichen Xu,Dejun Li,Qi Deng,Jiangming Mo
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:877: 162965-162965 被引量:21
标识
DOI:10.1016/j.scitotenv.2023.162965
摘要

The traditional view holds that biological nitrogen (N) fixation is energetically expensive and thus, facultative N fixers reduce N fixation rates while obligate N fixers are excluded by non-N fixers as soil N becomes rich. This view, however, contradicts the phenomenon that N fixation does not decline in many terrestrial ecosystems under N enrichment. To address this paradoxical phenomenon, we conducted a meta-analysis of N fixation and diazotroph (N-fixing microorganism) community structure in response to N addition across terrestrial ecosystems. N addition inhibited N fixation, but the inhibitory effect weakened across increased soil organic carbon (SOC) concentrations. The response ratios of N fixation (including free-living, plant-associated, and symbiotic types) to N addition were lower in the ecosystems with low SOC concentrations (<10 mg/g) than in those with medium or high SOC concentrations (10–20 and > 20 mg/g, respectively). The negative N-addition effects on diazotroph abundance and diversity also weakened across increased SOC levels. Among the climatic and soil factors, SOC was the most important predictor regarding the responses of N fixation and diazotroph community structure to N addition. Overall, our study reveals the role of SOC in affecting the responses of N fixation to N addition, which helps understand the relationships of biological N fixation and N enrichment as well as the mechanisms of terrestrial C and N coupling.
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