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首页> 外文期刊>Ecosystems >Effects of Climate Change Drivers on Nitrous Oxide Fluxes in an Upland Temperate Grassland
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Effects of Climate Change Drivers on Nitrous Oxide Fluxes in an Upland Temperate Grassland

机译：气候变化驱动因素对陆地温带草原一氧化二氮通量的影响

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Despite increasing interest in the patterns of trace gas emissions in terrestrial ecosystems, little is known about the impacts of climate change on nitrous oxide (N sub(2)O) fluxes. The aim of this study was to determine the importance of the three main drivers of climate change (warming, summer drought, and elevated CO sub(2) concentrations) on N sub(2)O fluxes from an extensively managed, upland grassland. Over a 2-year period, we monitored N sub(2)O fluxes in an in situ ecosystem manipulation experiment simulating the climate predicted for the study area in 2080 (3.5 degree C temperature increase, 20% reduction in summer rainfall and atmospheric CO sub(2) levels of 600ppm). N sub(2)O fluxes showed significant seasonal and interannual variation irrespective of climate treatment, and were higher in summer and autumn compared with winter and spring. Overall, N sub(2)O emissions showed a positive correlation with soil temperature and rainfall. Elevated temperature had a positive impact on mean annual N sub(2)O fluxes but effects were only significant in 2007. Contrary to expectations, neither combined summer drought and warming nor the simultaneous application of elevated atmospheric CO sub(2) concentrations, summer drought and warming had any significant effect on annual N sub(2)O fluxes. However, the maximum N sub(2)O flux rates observed during the study occurred when elevated CO sub(2) was combined with warming and drought, suggesting the potential for important, short-term N sub(2)O-N losses in enriched CO sub(2) environments. Taken together, our results suggest that the N sub(2)O responses of temperate, extensively managed grasslands to future climate change scenarios may be primarily driven by temperature effects.
机译：尽管人们对陆地生态系统中的痕量气体排放模式越来越感兴趣，但对于气候变化对一氧化二氮（N sub（2）O）通量的影响知之甚少。这项研究的目的是确定气候变化的三个主要驱动因素（变暖，夏季干旱和CO sub（2）浓度升高）对来自高度管理的高地草地的N sub（2）O通量的重要性。在2年的时间里，我们在原位生态系统操作实验中监测了N sub（2）O通量，该实验模拟了研究区域2080年预测的气候（温度升高3.5摄氏度，夏季降雨量减少20％，大气CO减少（2）600ppm的水平。 N sub（2）O通量显示出明显的季节和年际变化，而与气候处理无关，并且在夏季和秋季比冬季和春季更高。总体而言，N sub（2）O排放与土壤温度和降雨呈正相关。升高的温度对年均N sub（2）O通量有积极影响，但影响仅在2007年才显着。与预期相反，夏季干旱和变暖并没有同时应用大气CO sub（2）浓度升高，夏季干旱并且变暖对年N sub（2）O通量有显着影响。但是，在研究期间观察到的最大N sub（2）O通量率发生在升高的CO sub（2）与变暖和干旱相结合的情况下，这表明富集CO中短期，短期Nsub（2）ON损失的可能性sub（2）环境。两者合计，我们的结果表明，温带，广泛管理的草地对未来气候变化情景的N sub（2）O响应可能主要由温度效应驱动。

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