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首页> 外文期刊>Plant and Soil >Precipitation variability does not affect soil respiration and nitrogen dynamics in the understorey of a Mediterranean oak woodland
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Precipitation variability does not affect soil respiration and nitrogen dynamics in the understorey of a Mediterranean oak woodland

机译：降水变化不会影响地中海橡木林下层的土壤呼吸和氮素动态

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Future climate scenarios for the Mediterranean imply increasing precipitation variability. This study presents a large-scale water manipulation experiment simulating changes in precipitation variability, aiming at a better understanding of the effects of rainfall patterns on soil C and N cycling and understorey productivity in a Mediterranean oak woodland. We used rain-out shelters to achieve (1) a normal dry period (7 days), and (2) a dry period increased three-fold (21 days), without altering total annual precipitation inputs. The temporal patterns of soil respiration (R (s)) and soil inorganic N were not affected by treatment. However, water infiltration and N leaching increased with large infrequent watering events. R (s) and soil NH4 (+)-N correlated with soil temperature, with soil NO3 (-)-N being influenced by leaching. The lack of significant treatment effects on either R (s) or soil inorganic N can be explained by (1) minor differences in plant productivity between the treatments, suggesting equal plant N demand, and (2) the absence of moisture dependence of R (s) and soil NH4 (+)-N. Increased N leaching with large infrequent precipitation events may have longer-term consequences for ecosystem functioning. Our results contribute to an improved understanding of possible climate change effects on key ecosystem processes in Mediterranean ecosystems.RI Unger, Stephan/A-1988-2009
机译：地中海地区未来的气候情景意味着降水多变性。这项研究提出了一个大型的水处理实验，模拟了降水变化的变化，目的是更好地了解降雨模式对地中海橡树林地土壤碳氮循环和林下生产力的影响。我们使用了防雨棚，以实现（1）正常的干旱时期（7天），和（2）干旱时期增加了三倍（21天），而没有改变总的年降水量。土壤呼吸（R（s））和土壤无机氮的时间模式不受处理的影响。然而，水的渗透和氮的浸出随着不频繁浇水事件的增加而增加。 R（s）和土壤NH4（+）-N与土壤温度相关，而土壤NO3（-）-N受淋溶影响。对（R）或土壤无机N缺乏显着的处理效果可以解释为（1）处理之间植物生产力的细微差异，表明对植物N的需求相等;（2）对R的水分依赖性不存在（ s）和土壤NH4（+）-N。 N淋失增加且降雨事件很少发生，可能会对生态系统功能产生长期影响。我们的研究结果有助于人们更好地了解气候变化对地中海生态系统中关键生态系统过程的影响.RI Unger，Stephan / A-1988-2009

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