Contrasting fate and GHG emissions of algal vs. manure DOM under light and microbes in lakes.

IF 4.5 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

iScience Pub Date : 2026-09-22 eCollection Date: 2026-10-16 DOI:10.1016/j.isci.2026.117674

Yulong Tao, Qianyong Wang, Muren Bao, Yutong Tian, Lu Lu

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引用次数: 0

Abstract

The escalating dissolved organic matter (DOM) inputs from algal (ADOM) and livestock manure (MDOM) sources are altering lake ecosystems, yet their fate under light and microbes in steppe lakes is unclear. Using microcosms, we found that photodegradation suppressed ADOM bioavailability by 4.8% via substrate competition and reactive oxygen species (ROS) inhibition (especially singlet oxygen), while light enhanced MDOM bioavailability by 5.4%. ADOM mineralization released 1.6× more CO₂ than MDOM. Multi-group structural equation modeling (SEM) indicated that efficient ADOM microbial transformation drove higher CO₂ emissions, whereas light-induced ROS shifted microbial communities and transformation pathways. ADOM and MDOM inputs predominantly enhanced CO₂ emissions and water browning, respectively. These processes are interconnected-exogenous MDOM can promote algal blooms and subsequent greenhouse gas release. For eutrophic steppe lakes, integrated management combining exogenous load reduction and endogenous bloom suppression is critical to mitigate ecological risks and greenhouse effects.

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湖泊光照和微生物条件下藻类与粪肥DOM的命运和温室气体排放对比。

藻类（ADOM）和牲畜粪便（MDOM）不断增加的溶解有机物（DOM）输入正在改变湖泊生态系统，但它们在草原湖泊光和微生物下的命运尚不清楚。在微观环境中，我们发现光降解通过底物竞争和活性氧（ROS）抑制（尤其是单重态氧）抑制了addom的生物利用度，使其生物利用度降低了4.8%，而光降解使MDOM的生物利用度提高了5.4%。ADOM矿化释放的二氧化碳比MDOM多1.6倍。多组结构方程模型（SEM）表明，高效的ADOM微生物转化驱动了更高的CO2排放，而光诱导的ROS改变了微生物群落和转化途径。ADOM和MDOM的输入分别主要增加了CO2排放和水褐变。这些过程是相互关联的——外源MDOM可以促进藻华和随后的温室气体释放。对于富营养化草原湖泊，减少外源负荷与抑制内源水华相结合的综合管理是缓解生态风险和温室效应的关键。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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