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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Energy and water additions give rise to simple responses in plant canopy and soil microclimates of a high arctic ecosystem
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Energy and water additions give rise to simple responses in plant canopy and soil microclimates of a high arctic ecosystem

机译：能量和水的添加会在北极高生态系统的植物冠层和土壤微气候中产生简单的响应

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摘要

Energy and water inputs were increased during the snow-free season to test the sensitivity of a cold, dry ecosystem to climate change. Infrared radiators were used to provide two levels of supplemental radiation (T1 and T2) to prostrate dwarf-shrub, herb tundra in northwest Greenland. The higher radiation addition was combined with supplemental water in a factorial design. Radiation additions increased midday canopy temperatures by up to 4.0°C and 6.0°C and growing season mean shallow soil temperatures by 1.3°C and 2.4°C in T1 and T2 plots, respectively. Soil warming was measured at and probably exceeded 10 cm in depth. There was no evidence of soil drying in plots that received additional radiation, in contrast with other studies, nor was there evidence that supplemental water interacted with radiation additions to affect soil temperatures. Water additions were generally undetectable against a background of large seasonal changes in soil water content. We suggest that well-drained soils and strong seasonal controls on soil water contents (e.g., soil thaw and evapotranspiration) limit the system's sensitivity to changes in precipitation during the brief growing season. In general, multifactor changes in climate gave rise to simple changes in the vegetation microclimate of this cold, dry ecosystem.
机译：在无雪季节，能源和水的输入增加了，以测试寒冷干燥的生态系统对气候变化的敏感性。红外辐射器用于提供两个水平的补充辐射（T1和T2），以使矮灌木灌木，草本苔原在格陵兰岛西北部生长。在析因设计中，较高的辐射添加量与补充水结合在一起。在T1和T2地块中，添加辐射使中午冠层温度分别升高了4.0°C和6.0°C，生长季节的平均浅层土壤温度分别升高了1.3°C和2.4°C。测得的土壤变暖深度约为10厘米。与其他研究相反，没有证据表明接受额外辐射的地块土壤干燥，也没有证据表明补充水与辐射附加物相互作用会影响土壤温度。在土壤含水量季节性大变化的背景下，通常无法检测到添加水。我们建议排水良好的土壤以及对土壤水分的严格季节性控制（例如土壤融化和蒸散）限制了该系统对短暂生长期降水变化的敏感性。通常，气候的多因素变化导致了这个寒冷干燥的生态系统的植被微气候发生简单变化。

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