当前位置：
X-MOL 学术
›
Glob. Change Biol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Microbial metabolic response to winter warming stabilizes soil carbon
Global Change Biology ( IF 10.8 ) Pub Date : 2021-02-02 , DOI: 10.1111/gcb.15538
Jing Tian 1, 2 , Ning Zong 2 , Iain P. Hartley 3 , Nianpeng He 2 , Jinjing Zhang 4 , David Powlson 5 , Jizhong Zhou 6, 7 , Yakov Kuzyakov 8, 9 , Fusuo Zhang 1 , Guirui Yu 2 , Jennifer A.J. Dungait 3, 10
Global Change Biology ( IF 10.8 ) Pub Date : 2021-02-02 , DOI: 10.1111/gcb.15538
Jing Tian 1, 2 , Ning Zong 2 , Iain P. Hartley 3 , Nianpeng He 2 , Jinjing Zhang 4 , David Powlson 5 , Jizhong Zhou 6, 7 , Yakov Kuzyakov 8, 9 , Fusuo Zhang 1 , Guirui Yu 2 , Jennifer A.J. Dungait 3, 10
Affiliation
|
Current consensus on global climate change predicts warming trends with more pronounced temperature changes in winter than summer in the Northern Hemisphere at high latitudes. Moderate increases in soil temperature are generally related to faster rates of soil organic carbon (SOC) decomposition in Northern ecosystems, but there is evidence that SOC stocks have remained remarkably stable or even increased on the Tibetan Plateau under these conditions. This intriguing observation points to altered soil microbial mediation of carbon‐cycling feedbacks in this region that might be related to seasonal warming. This study investigated the unexplained SOC stabilization observed on the Tibetan Plateau by quantifying microbial responses to experimental seasonal warming in a typical alpine meadow. Ecosystem respiration was reduced by 17%–38% under winter warming compared with year‐round warming or no warming and coincided with decreased abundances of fungi and functional genes that control labile and stable organic carbon decomposition. Compared with year‐round warming, winter warming slowed macroaggregate turnover rates by 1.6 times, increased fine intra‐aggregate particulate organic matter content by 75%, and increased carbon stabilized in microaggregates within stable macroaggregates by 56%. Larger bacterial “necromass” (amino sugars) concentrations in soil under winter warming coincided with a 12% increase in carboxyl‐C. These results indicate the enhanced physical preservation of SOC under winter warming and emphasize the role of soil microorganisms in aggregate life cycles. In summary, the divergent responses of SOC persistence in soils exposed to winter warming compared to year‐round warming are explained by the slowing of microbial decomposition but increasing physical protection of microbially derived organic compounds. Consequently, the soil microbial response to winter warming on the Tibetan Plateau may cause negative feedbacks to global climate change and should be considered in Earth system models.
中文翻译：
对冬季变暖的微生物代谢反应稳定了土壤碳
目前关于全球气候变化的共识预测，北半球高纬度地区冬季的温度变化将比夏季的夏季明显，而冬季的温度变化更为明显。土壤温度的适度升高通常与北方生态系统中土壤有机碳（SOC）分解速度加快有关，但是有证据表明，在这些条件下，青藏高原的SOC储量一直保持显着稳定甚至增加。有趣的观察表明，该地区土壤微生物对碳循环反馈的调节作用可能与季节性变暖有关。这项研究通过量化典型高山草甸对实验性季节变暖的微生物响应，调查了在青藏高原上观察到的无法解释的SOC稳定性。与全年变暖或不变暖相比，冬季变暖下的生态系统呼吸减少了17％–38％，同时真菌和控制不稳定和稳定的有机碳分解的功能基因的丰度下降。与全年变暖相比，冬季变暖使大型骨料的周转率降低了1.6倍，使骨料中细颗粒有机物的含量增加了75％，并使稳定骨料中微骨料的碳稳定化增加了56％。在冬季变暖下，土壤中较大的细菌“坏死”（氨基糖）浓度与羧基C增加了12％相吻合。这些结果表明，在冬季变暖下，有机碳的物理保存能力得到了增强，并强调了土壤微生物在总生命周期中的作用。总之，与全年变暖相比，暴露于冬季变暖的土壤中SOC持久性的不同响应可以解释为微生物分解速度减慢，但微生物衍生的有机化合物的物理保护作用增强。因此，青藏高原土壤微生物对冬季变暖的反应可能导致对全球气候变化的负面反馈，因此应在地球系统模型中加以考虑。
更新日期：2021-02-02
中文翻译：
对冬季变暖的微生物代谢反应稳定了土壤碳
目前关于全球气候变化的共识预测，北半球高纬度地区冬季的温度变化将比夏季的夏季明显，而冬季的温度变化更为明显。土壤温度的适度升高通常与北方生态系统中土壤有机碳（SOC）分解速度加快有关，但是有证据表明，在这些条件下，青藏高原的SOC储量一直保持显着稳定甚至增加。有趣的观察表明，该地区土壤微生物对碳循环反馈的调节作用可能与季节性变暖有关。这项研究通过量化典型高山草甸对实验性季节变暖的微生物响应，调查了在青藏高原上观察到的无法解释的SOC稳定性。与全年变暖或不变暖相比，冬季变暖下的生态系统呼吸减少了17％–38％，同时真菌和控制不稳定和稳定的有机碳分解的功能基因的丰度下降。与全年变暖相比，冬季变暖使大型骨料的周转率降低了1.6倍，使骨料中细颗粒有机物的含量增加了75％，并使稳定骨料中微骨料的碳稳定化增加了56％。在冬季变暖下，土壤中较大的细菌“坏死”（氨基糖）浓度与羧基C增加了12％相吻合。这些结果表明，在冬季变暖下，有机碳的物理保存能力得到了增强，并强调了土壤微生物在总生命周期中的作用。总之，与全年变暖相比，暴露于冬季变暖的土壤中SOC持久性的不同响应可以解释为微生物分解速度减慢，但微生物衍生的有机化合物的物理保护作用增强。因此，青藏高原土壤微生物对冬季变暖的反应可能导致对全球气候变化的负面反馈，因此应在地球系统模型中加以考虑。
京公网安备 11010802027423号