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标题：Altered Snow Density and Chemistry Change Soil Nitrogen Mineralization and Plant Growth
其他标题：Altered Snow Density and Chemistry Change Soil Nitrogen Mineralization and Plant Growth
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作者：Christian Rixen ; Michele Freppaz ; Veronika Stoeckli 等
期刊名称：Arctic, Antarctic, and Alpine Research
印刷版ISSN：1523-0430
电子版ISSN：1938-4246
出版年度：2008
卷号：40
期号：3
页码：568-575
DOI：10.1657/1523-0430(07-044)[RIXEN]2.0.CO%3B2
摘要：Snow properties such as snow density will likely change in a warmer climate. Changes in depth and extent of snow cover have been shown to affect soil nutrient dynamics and plant growth; however, effects of a changed snow density have so far not been explicitly tested. We altered snow properties (especially depth and density according to those found on ski runs) and investigated effects on soil temperatures, soil nitrogen mineralization, plant phenology, and productivity. A denser, thinner snow cover led to reduced soil insulation and lower soil temperatures, which consequently increased net N mineralization. A denser snow cover furthermore resulted in a delay in plant phenology of up to five weeks after melt-out. The results suggest that changes in snow density, which have been largely neglected in the global change discussion until now, can cause significant changes in soil and vegetation processes.