CO2 升高下的硝化、反硝化及相关功能基因：陆地生态系统的荟萃分析,Global Change Biology

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CO2 升高下的硝化、反硝化及相关功能基因：陆地生态系统的荟萃分析
Global Change Biology ( IF 10.8 ) Pub Date : 2022-12-19 , DOI: 10.1111/gcb.16568
Robin Gineyts _{1,

2} , Audrey Niboyet _{1,

2}

Affiliation

全球变化可能对土壤氮 (N) 循环产生深远影响，土壤氮 (N) 循环可通过硝化作用和反硝化作用介导的一氧化二氮 (N _{2 O) 排放量增加，对气候变化产生积极反馈。}我们根据来自 58 篇出版物的 879 次观察和陆地生态系统中46 次独立的升高的 CO _{2实验，对升高的 CO}₂对硝化和反硝化作用的影响进行了荟萃分析。_{我们调查了单独升高的 CO 2}或与升高的温度、增加的降水量、干旱和 N 添加相结合的影响。_{我们评估了对升高的 CO 2}的反应总硝化作用和潜在硝化作用、潜在反硝化作用以及相关功能基因（古细菌amoA、细菌amoA、nirK、nirS和nosZ）的丰度。升高的 CO ₂增加了农田生态系统中的潜在硝化作用 (+28%) 和细菌amoA功能基因的丰度(+62%)。当与 N 添加和更高的降水量 (+116%) 相结合时，升高的 CO _{2会增加潜在的反硝化作用。}升高的 CO ₂还增加了陆地生态系统和nosZ中nirK (+25%) 和nirS (+27%) 功能基因的丰度(+32%) 农田生态系统中的功能基因。升高的 CO _2下nosZ丰度的增加在升高的温度和高 N (+62%) 下更大。_{在升高的 CO 2}和升高的温度、升高的 CO ₂和增加的降水以及升高的 CO ₂和 N 添加之间测试的 14 种双向相互作用中有四种具有轻微的显着性，并且大多具有协同作用。_{升高的 CO 2}对潜在硝化作用和细菌amoA和nirS丰度的影响功能基因随着年平均气温和年平均降水量的增加而增加。因此，我们的荟萃分析表明，世界大部分地区变暖和降水增加可能会加强硝化作用和反硝化作用对 CO ₂浓度升高的积极反应，并敦促需要在热带地区进行更多调查以及多种全球变化因素之间的相互作用，因为我们可能在很大程度上低估了全球变化对土壤 N ₂ O 排放的影响。

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Nitrification, denitrification, and related functional genes under elevated CO2: A meta-analysis in terrestrial ecosystems

Global change may have profound effects on soil nitrogen (N) cycling that can induce positive feedback to climate change through increased nitrous oxide (N₂O) emissions mediated by nitrification and denitrification. We conducted a meta-analysis of the effects of elevated CO₂ on nitrification and denitrification based on 879 observations from 58 publications and 46 independent elevated CO₂ experiments in terrestrial ecosystems. We investigated the effects of elevated CO₂ alone or combined with elevated temperature, increased precipitation, drought, and N addition. We assessed the response to elevated CO₂ of gross and potential nitrification, potential denitrification, and abundances of related functional genes (archaeal amoA, bacterial amoA, nirK, nirS, and nosZ). Elevated CO₂ increased potential nitrification (+28%) and the abundance of bacterial amoA functional gene (+62%) in cropland ecosystems. Elevated CO₂ increased potential denitrification when combined with N addition and higher precipitation (+116%). Elevated CO₂ also increased the abundance of nirK (+25%) and nirS (+27%) functional genes in terrestrial ecosystems and of nosZ (+32%) functional gene in cropland ecosystems. The increase in the abundance of nosZ under elevated CO₂ was larger at elevated temperature and high N (+62%). Four out of 14 two-way interactions tested between elevated CO₂ and elevated temperature, elevated CO₂ and increased precipitation, and elevated CO₂ and N addition were marginally significant and mostly synergistic. The effects of elevated CO₂ on potential nitrification and abundances of bacterial amoA and nirS functional genes increased with mean annual temperature and mean annual precipitation. Our meta-analysis thus suggests that warming and increased precipitation in large areas of the world could reinforce positive responses of nitrification and denitrification to elevated CO₂ and urges the need for more investigations in the tropical zone and on interactive effects among multiple global change factors, as we may largely underestimate the effects of global change on soil N₂O emissions.

更新日期：2022-12-19

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