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Functional structures of soil microbial community relate to contrasting N2O emission patterns from a highly acidified forest.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.scitotenv.2020.138504 Yina Zou 1 , Daliang Ning 2 , Yong Huang 1 , Yuting Liang 3 , Hui Wang 1 , Lei Duan 1 , Tong Yuan 4 , Zhili He 4 , Yunfeng Yang 1 , Kai Xue 4 , Joy D Van Nostrand 4 , Jizhong Zhou 5
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.scitotenv.2020.138504 Yina Zou 1 , Daliang Ning 2 , Yong Huang 1 , Yuting Liang 3 , Hui Wang 1 , Lei Duan 1 , Tong Yuan 4 , Zhili He 4 , Yunfeng Yang 1 , Kai Xue 4 , Joy D Van Nostrand 4 , Jizhong Zhou 5
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Nitrous oxide (N2O) is an important greenhouse gas contributing to global climate change. Emissions of N2O from acidic forests are increasing rapidly; however, little is known about the mechanisms driving these emissions. We analyzed soil samples from a high N2O emission area (HEA, 224-601 μg N m-2 h-1) and an adjacent low emission area (LEA, 20-30 μg N m-2 h-1) of a highly acidified forest. HEA showed similar carbon and nitrogen (N) pools and microbial biomass to LEA, but significantly higher moisture and extractable nutrients than LEA did. GeoChip 4 detected 298 gene families (unadjusted P < 0.05; 94, adjusted P < 0.05) showing significantly different structures between HEA and LEA. Both areas had highly diverse N cycling functional genes. However, HEA had higher relative abundances of nor, P450nor, and archaeal nitrifier nirK, which provided evidence for the importance of denitrifiers in N2O emission. HEA also showed significantly higher relative abundances of lignin- and cellulose-degrading genes, oxygen-limitation-response genes and denitrifier ppk, but lower abundances of N- and phosphorus (P) -limitation-response genes especially denitrifier pstS, corresponding to the higher moisture and extractable nutrients conducive to denitrification. The moisture, extractable nutrients and pH explained over 50% variation in microbial communities, and extractable P appeared as the key factor driving community variation and consequently regulated N2O production. CAPSULE ABSTRACT: N2O emission in highly acidified forest soils was related to the diverse N functional genes, especially denitrification genes, and was affected by soil properties.
中文翻译：
土壤微生物群落的功能结构与来自高度酸化森林的N2O排放模式形成对比。
一氧化二氮（N2O）是导致全球气候变化的重要温室气体。酸性森林中的N2O排放正在迅速增加。但是，对于驱动这些排放的机制知之甚少。我们分析了高酸化的高N2O排放区域（HEA，224-601μgN m-2 h-1）和相邻的低排放区域（LEA，20-30μgN m-2 h-1）的土壤样品森林。HEA显示出与LEA相似的碳和氮（N）池以及微生物生物量，但水分和可提取的养分明显高于LEA。GeoChip 4检测到298个基因家族（未调整P <0.05； 94，已调整P <0.05），显示HEA和LEA之间的结构显着不同。这两个区域都有高度多样化的N循环功能基因。但是，HEA的nor，P450nor和古硝化器nirK的相对丰度较高，这提供了反硝化剂在N2O排放中的重要性的证据。HEA还显示出木质素和纤维素降解基因，氧限制反应基因和反硝化酶ppk的相对丰度明显更高，但N和磷（P）限制反应基因（尤其是反硝化剂pstS）的相对丰度较低，对应较高水分和可提取的养分有利于反硝化。水分，可提取的养分和pH值说明了微生物群落的50％以上变化，而可萃取的P则是驱动群落变化并因此调节N2O产生的关键因素。胶囊摘要：在高度酸化的森林土壤中，N2O的释放与多种N功能基因（尤其是反硝化基因）有关，并受土壤性质的影响。
更新日期：2020-04-06
中文翻译：
土壤微生物群落的功能结构与来自高度酸化森林的N2O排放模式形成对比。
一氧化二氮（N2O）是导致全球气候变化的重要温室气体。酸性森林中的N2O排放正在迅速增加。但是，对于驱动这些排放的机制知之甚少。我们分析了高酸化的高N2O排放区域（HEA，224-601μgN m-2 h-1）和相邻的低排放区域（LEA，20-30μgN m-2 h-1）的土壤样品森林。HEA显示出与LEA相似的碳和氮（N）池以及微生物生物量，但水分和可提取的养分明显高于LEA。GeoChip 4检测到298个基因家族（未调整P <0.05； 94，已调整P <0.05），显示HEA和LEA之间的结构显着不同。这两个区域都有高度多样化的N循环功能基因。但是，HEA的nor，P450nor和古硝化器nirK的相对丰度较高，这提供了反硝化剂在N2O排放中的重要性的证据。HEA还显示出木质素和纤维素降解基因，氧限制反应基因和反硝化酶ppk的相对丰度明显更高，但N和磷（P）限制反应基因（尤其是反硝化剂pstS）的相对丰度较低，对应较高水分和可提取的养分有利于反硝化。水分，可提取的养分和pH值说明了微生物群落的50％以上变化，而可萃取的P则是驱动群落变化并因此调节N2O产生的关键因素。胶囊摘要：在高度酸化的森林土壤中，N2O的释放与多种N功能基因（尤其是反硝化基因）有关，并受土壤性质的影响。
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