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从洪水转向滴灌改变了干旱农田的土壤不稳定有机碳

Danni Wang¹, Fangfang Qin², Shiying Lin³

¹Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, 315830, China; College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.

Environmental research

|August 10, 2025

概括

在干旱土地上将洪水灌转化为滴灌,尽管增加了土壤无机碳 (SIC),但降低了土壤有机碳 (SOC) 和有机颗粒碳 (POC). 这凸显了滴灌系统中减缓策略的必要性.

科学领域:

农业科学农业科学
土壤科学土壤科学
环境科学环境科学

背景情况:

滴灌是干旱地区节水的一种技术.
它对土壤有机碳 (SOC) 动态的影响,特别是不稳定有机碳 (LOC) 分数的影响,尚不清楚.

研究的目的:

研究从洪水灌转向滴灌对碳库存,LOC分数和微生物群落的影响.
了解灌方法的变化如何影响土壤碳动态.

主要方法:

来自不同深度 (0-60厘米) 的洪水和滴灌灌田地的土壤样本的比较.
对土壤有机碳 (SOC),土壤无机碳 (SIC),有机颗粒碳 (POC) 和轻微分子有机碳 (LFOC) 的分析.
评估酶活动,微生物生物质和微生物碳利用效率 (CUE).

主要成果:

滴灌减少了SOC和POC,但增加了SIC,导致总C库存增加.
在所有土壤层 (31-54%) 中观察到POC的显著减少.
发现了微生物生物质和CUE的增加,CUE与LOC组件有负相关性.

结论:

转换为滴灌,在干旱的农业系统中耗尽了SOC和POC储量.
微生物碳利用效率不仅仅是推动LOC积累的原因.
有针对性的缓解策略是必要的,以实现可持续的滴灌实践.

关键词:

干旱的农业田地干旱的农业田地微生物微生物土壤不稳定的有机碳节水的做法节水的做法

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