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Substrate Carbon Controls Regional Divergence of Wetland Biofilm Carbon Sinks under Climate Warming
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DOI：10.1021/acs.est.6c03534.png)
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Abstract
En 中文
Microbial biofilms at soil–water interfaces mediate carbon exchange between soils and the atmosphere, yet whether substrate state alters their climate sensitivity remains poorly understood. Here, we analyzed 1080 rice-paddy sites across 26 regions of China to test whether soil organic carbon (SOC) regulates periphytic biofilm organic carbon (PB-TOC) responses to warming. SOC emerged as the dominant predictor of PB-TOC and showed a statistically supported threshold at ∼20 g kg–1. Below this threshold, PB-TOC increased with SOC and was positively associated with mean annual temperature and precipitation, consistent with a substrate-limited compensatory response. Above the threshold, PB-TOC approached saturation, and climate associations became negative, indicating greater vulnerability of carbon-rich interfaces. CMIP6-based projections suggest that under SSP5–8.5, China’s paddy-interface biofilm carbon pool could decline by about 0.70 Tg C by 2100, driven mainly by 4.5–6.8% losses in high-SOC regions that are only partly offset by modest gains in low-SOC regions (0.8–1.5%). These findings indicate that wetland climate responses are state-dependent and that substrate thresholds should be incorporated into carbon–climate assessments.
Keywords:
soil-water interface
periphytic biofilm
ecological thresholds
soil organic carbon
climate change
carbon-climate feedback
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