Idiosyncratic Responses of High Arctic Plants to Changing Snow Regimes
Idiosyncratic Responses of High Arctic Plants to Changing Snow Regimes
复制标题
高北极植物对雪情变化的特殊反应
作者：
S. Rumpf;P. Semenchuk;S. Dullinger;E. Cooper
北极是受气候变化影响最大的生态系统之一;特别是，冬季气温和降水量预计将增加，积雪深度和持续时间也随之发生变化。无雪期是否会缩短或延长取决于温度和降水上升的程度和时间模式;由此产生的变化可能会影响植物生长，并对整个生态系统产生级联效应。我们实验性地操纵雪制度，使用雪栅栏和铲，并评估地上大小的八个常见的高北极植物物种，整个夏天每周。我们证明了植物生长对雪情的响应，无雪期的气温总和是植物大小的最佳预测因子。我们研究的大多数物种表现出周期性的增长，在一定的累积温度后，植物大小的增加停止。植物在早期无雪治疗没有额外的春季变暖小于对照组。对较深的雪与后来的融化的反应不同物种和分类的增长形式或栖息地协会的反应没有显示出一般的趋势。因此，我们强调的重要性，检查在物种水平上的反应，因为广义的预测地上生长变化的雪制度的反应不能。
The Arctic is one of the ecosystems most affected by climate change; in particular, winter temperatures and precipitation are predicted to increase with consequent changes to snow cover depth and duration. Whether the snow-free period will be shortened or prolonged depends on the extent and temporal patterns of the temperature and precipitation rise; resulting changes will likely affect plant growth with cascading effects throughout the ecosystem. We experimentally manipulated snow regimes using snow fences and shoveling and assessed aboveground size of eight common high arctic plant species weekly throughout the summer. We demonstrated that plant growth responded to snow regime, and that air temperature sum during the snow free period was the best predictor for plant size. The majority of our studied species showed periodic growth; increases in plant size stopped after certain cumulative temperatures were obtained. Plants in early snow-free treatments without additional spring warming were smaller than controls. Response to deeper snow with later melt-out varied between species and categorizing responses by growth forms or habitat associations did not reveal generic trends. We therefore stress the importance of examining responses at the species level, since generalized predictions of aboveground growth responses to changing snow regimes cannot be made.