Nitrifiers and denitrifiers respond rapidly to changed moisture and increasing temperature in a pristine forest soil.
Nitrifiers and denitrifiers respond rapidly to changed moisture and increasing temperature in a pristine forest soil.
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DOI：
10.1111/j.1574-6941.2010.00853.x
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发表时间：
2010-06
影响因子：
4.2
通讯作者：
Zechmeister-Boltenstern S
中科院分区：
文献类型：
--
作者：
Szukics U;Abell GC;Hödl V;Mitter B;Sessitsch A;Hackl E;Zechmeister-Boltenstern S
土壤中矿质氮（N）的完整循环需要进行硝化和反硝化的微生物的相互作用，这些微生物的活动越来越受到极端降雨或气候变化带来的高温的影响。在原始森林土壤中，在一定含水量范围内，土壤温度从 5°C 逐渐升高至 25°C，会刺激氮周转率，而氮气体排放量则由土壤充水孔隙空间 (WFPS) 决定。 NO 和 N2O 排放量分别占 WFPS 的 30% 和 55%，温度逐步升高导致 NO3− 浓度增加 3 倍，NH4+ 浓度降低。在 70% WFPS 时，NH4+ 积累，而 NO3− 库下降，表明气态氮损失。基于 AmoA 和 nirK 基因的分析表明，随着土壤温度的升高，细菌氨氧化剂 (AOB) 的丰度增加，而 25°C 湿土壤中古菌氨氧化剂 (AOA) 的丰度下降，表明对厌氧条件敏感。反硝化 (nirK) 群落结构受含水量的影响最大，nirK 基因丰度响应潮湿条件而迅速增加，直到底物 (NO3−) 受到限制。 nirK 的群落结构变化最为明显，AOA 的群落结构变化迅速，表明种群处于动态状态，而 AOB 群落的适应需要五周时间，表明稳定性更高。
Complete cycling of mineral nitrogen (N) in soil requires the interplay of microorganisms performing nitrification and denitrification, whose activity is increasingly affected by extreme rainfalls or heat brought about by climate change. In a pristine forest soil, a gradual increase in soil temperature from 5°C to 25°C at a range of water contents stimulated N turnover rates and N gas emissions were determined by the soil water-filled pore space (WFPS). NO and N2O emissions dominated at 30% WFPS and 55% WFPS respectively and the step-wise temperature increase resulted in 3-fold increased NO3− concentrations and decreased NH4+ concentrations. At 70% WFPS NH4+ accumulated, whereas NO3− pools declined indicating gaseous N loss. AmoA- and nirK gene based analysis revealed increasing abundance of bacterial ammonia oxidizers (AOB) with rising soil temperature, whereas decreased abundance of archaeal ammonia oxidizers (AOA) in wet soil at 25°C suggested sensitivity to anaerobic conditions. Denitrifying (nirK) community structures were most affected by the water content and nirK gene abundance rapidly increased in response to wet conditions until substrate (NO3−) became limiting. Shifts in the community structure were most pronounced for nirK and rapid for AOA, indicating dynamic populations, whereas adaptations of the AOB communities required five weeks, suggesting higher stability.
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影响因子：
6.5
作者：
Gödde, M;Conrad, R
通讯作者：
Conrad, R
影响因子：
11
作者：
Abell, Guy C. J.;Revill, Andrew T.;Robert, Stanley S.
通讯作者：
Robert, Stanley S.
影响因子：
9.7
作者：
BERG, P;KLEMEDTSSON, L;ROSSWALL, T
通讯作者：
ROSSWALL, T
影响因子：
4.8
作者：
KENKEL, NC;ORLOCI, L
通讯作者：
ORLOCI, L
DOI：
10.2136/sssaj1992.03615995005600010015x
发表时间：
1992-01-01
影响因子：
2.9
作者：
DAVIDSON, EA
通讯作者：
DAVIDSON, EA