Root exudates with low C/N ratios accelerate CO2 emissions from paddy soil

矿化(土壤科学) 渗出液 化学 化学计量学 根际 环境化学 微生物 食品科学 植物 氮气 细菌 生物 有机化学 遗传学
作者
Guan Cai,Muhammad Shahbaz,Tida Ge,Yajun Hu,Baozhen Li,Hongzhao Yuan,Yi Wang,Yuhuai Liu,Qiong Liu,Olga Shibistova,Leopold Sauheitl,Jinshui Wu,Georg Guggenberger,Zhenke Zhu
出处
期刊:Land Degradation & Development [Wiley]
卷期号:33 (8): 1193-1203 被引量:13
标识
DOI:10.1002/ldr.4198
摘要

Abstract Root exudates can significantly modify microbial activity and soil organic matter (SOM) mineralization. However, how root exudates and their C/N stoichiometric ratios control rice field (paddy) soil C mineralization is poorly understood. This study used a mixture of glucose, oxalic acid, and alanine as root exudate mimics for three C/N stoichiometric ratios (CN6, CN10, and CN80) to explore the underlying mechanisms involved in SOM mineralization. The input of root exudates enhanced CO 2 emissions by 1.8–2.3‐fold that of soil with only C additions (C‐only). Artificial root exudates with low C/N ratios (CN6 and CN10) increased the metabolic quotient (qCO 2 ) by 12% over those with higher stoichiometric ratios (CN80 and C‐only), suggesting a relatively high energy demand for microorganisms to acquire organic N from SOM by increasing N‐hydrolase production. The increase of stoichiometric ratios of C‐ to N‐hydrolase [β‐1,4‐glucosidase to β‐1,4‐N‐acetyl glucosaminidase (NAG)] promoted SOM degradation compared to those involved in organic C‐ and N‐degradation, which had a significant positive correlation with qCO 2 . The stoichiometric ratios of microbial biomass were positively correlated with C use efficiency, indicating root exudates with higher C/N ratios provide an undersupply of N for microorganisms that trigger the release of N‐degrading extracellular enzymes. Our findings showed that the C/N stoichiometry of root exudates controlled SOM mineralization by affecting the specific response of the microbial biomass through the activity of C‐ and N‐releasing extracellular enzymes to adjust the microbial C/N ratio.
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