Soil CO(2) and N(2)O emissions and microbial abundances altered by temperature rise and nitrogen addition in active-layer soils of permafrost peatland.
Soil CO(2) and N(2)O emissions and microbial abundances altered by temperature rise and nitrogen addition in active-layer soils of permafrost peatland.
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多年冻土泥炭地活性层土壤温度升高和氮添加改变土壤CO2和N2O排放以及微生物丰度
DOI：
10.3389/fmicb.2022.1093487
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发表时间：
2022
影响因子：
5.2
通讯作者：
Wang, Xianwei
中科院分区：
文献类型：
--
作者：
Song, Yanyu;Cheng, Xiaofeng;Song, Changchun;Li, Mengting;Gao, Siqi;Liu, Zhendi;Gao, Jinli;Wang, Xianwei
由于气候变化和氮输入而引起的土壤CO2和N2 O排放的变化将导致大气CO2和N2 O水平的增加，从而反馈到地球气候中。了解冻土泥炭地微生物介导的土壤碳、氮排放对温度升高的响应对区域碳、氮平衡模拟具有重要意义。通过15 ° C和20°C的室内培养试验，研究了温度升高对冻土泥炭地土壤CO2和N2 O排放以及土壤微生物丰度的影响。将浓度为50 mg N kg−1的NH 4 NO3溶液添加到土壤中，以研究氮添加的效果。结果表明，温度升高、碱解氮及其联合作用显著增加了冻土泥炭地CO2和N2 O的排放量。然而，土壤CO2和N2 O排放的温度敏感性不受氮添加。增温显著增加了土壤中甲烷菌、甲烷氧化菌和nirK型厌氧微生物的数量，增加了土壤溶解性有机碳（DOC）和氨氮的含量，而nirS型厌氧微生物、β-1，4-葡萄糖苷酶（βG）、纤维二糖水解酶（CBH）和酸性磷酸酶（AP）的活性显著降低。施氮显著增加了土壤nirS型微生物的丰度、β-1，4-N-乙酰氨基葡萄糖苷酶（NAG）活性、氨氮和硝态氮含量，但显著降低了细菌、产甲烷菌的丰度、CBH和AP活性。温度升高和施氮对土壤真菌和甲烷氧化菌丰度、NAG活性、DOC和DON含量有协同效应。土壤CO2排放量与土壤真菌丰度、NAG活性、氨氮和硝态氮含量呈显著正相关。土壤N2 O排放量与土壤真菌、甲烷氧化菌和nirK型微生物丰度、DOC、氨氮和硝酸盐含量呈正相关。这些结果表明，土壤微生物，活性碳，氮调节土壤碳，氮排放的重要性。研究结果有助于模拟全球气候变化对冻土泥炭地碳氮循环的影响。
Changes in soil CO2 and N2O emissions due to climate change and nitrogen input will result in increased levels of atmospheric CO2 and N2O, thereby feeding back into Earth’s climate. Understanding the responses of soil carbon and nitrogen emissions mediated by microbe from permafrost peatland to temperature rising is important for modeling the regional carbon and nitrogen balance. This study conducted a laboratory incubation experiment at 15 and 20°C to observe the impact of increasing temperature on soil CO2 and N2O emissions and soil microbial abundances in permafrost peatland. An NH4NO3 solution was added to soil at a concentration of 50 mg N kg−1 to investigate the effect of nitrogen addition. The results indicated that elevated temperature, available nitrogen, and their combined effects significantly increased CO2 and N2O emissions in permafrost peatland. However, the temperature sensitivities of soil CO2 and N2O emissions were not affected by nitrogen addition. Warming significantly increased the abundances of methanogens, methanotrophs, and nirK-type denitrifiers, and the contents of soil dissolved organic carbon (DOC) and ammonia nitrogen, whereas nirS-type denitrifiers, β-1,4-glucosidase (βG), cellobiohydrolase (CBH), and acid phosphatase (AP) activities significantly decreased. Nitrogen addition significantly increased soil nirS-type denitrifiers abundances, β-1,4-N- acetylglucosaminidase (NAG) activities, and ammonia nitrogen and nitrate nitrogen contents, but significantly reduced bacterial, methanogen abundances, CBH, and AP activities. A rising temperature and nitrogen addition had synergistic effects on soil fungal and methanotroph abundances, NAG activities, and DOC and DON contents. Soil CO2 emissions showed a significantly positive correlation with soil fungal abundances, NAG activities, and ammonia nitrogen and nitrate nitrogen contents. Soil N2O emissions showed positive correlations with soil fungal, methanotroph, and nirK-type denitrifiers abundances, and DOC, ammonia nitrogen, and nitrate contents. These results demonstrate the importance of soil microbes, labile carbon, and nitrogen for regulating soil carbon and nitrogen emissions. The results of this study can assist simulating the effects of global climate change on carbon and nitrogen cycling in permafrost peatlands.
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影响因子：
12.6
作者：
Chen, Mengli;Chang, Lian;Zhang, Junmao;Guo, Fucheng;Vymazal, Jan;He, Qiang;Chen, Yi
通讯作者：
Chen, Yi
影响因子：
10.1
作者：
Keesing, F
通讯作者：
Keesing, F
影响因子：
3.7
作者：
Dacal, Marina;Delgado-Baquerizo, Manuel;Garcia-Palacios, Pablo
通讯作者：
Garcia-Palacios, Pablo
影响因子：
6.1
作者：
Duan, Pengpeng;Song, Yanfeng;Xiong, Zhengqin
通讯作者：
Xiong, Zhengqin
影响因子：
3.7
作者：
Le, Thuong Ba;Wu, Jianghua;Vogt, Judith
通讯作者：
Vogt, Judith