Early snowmelt by an extreme warming event affects understory more than overstory trees in Japanese temperate forests
Early snowmelt by an extreme warming event affects understory more than overstory trees in Japanese temperate forests
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在日本温带森林中，极端变暖事件导致的早期融雪对林下树木的影响大于对林下树木的影响
DOI：
10.1002/ecs2.4182
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发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
Kentaro Takagi
中科院分区：
文献类型：
--
作者：
Makoto Kobayashi;Pamela H. Templer;Ayumi Katayama;Osamu Seki;Kentaro Takagi
预计在高纬度生态系统中，即使在总降水量没有相应减少的时期，极端温暖事件和早期积雪融化的发生也会增加。然而，由于这样的极端事件发生是不可预测的，人们对单个极端温暖事件推进的积雪融化而不减少降雨量，如何同时影响生态系统中的盖层树木和林下植被知之甚少。我们在日本温带森林中进行了4个20 × 20 m样地变暖试验，以确定早期融雪对林下矮化竹类植物和地上部分桦树的影响。我们的实验处理将积雪融化提前了约10 天，并提高了土壤温度，这与土壤氮素矿化和硝化速率的增加有关。此外，这些变化导致了较低的叶片C/N比和较大的林下竹子植被生长，而地上部分白桦树的叶片C/N和生长速率没有变化。总之，我们的结果表明，在温带森林中，极端温暖事件导致的积雪融化可能会影响N循环，并将有利于林下植被，而不会对地上植被产生相应的变化，这可能是由于有效土壤N的增加。这些结果还表明，随着极端温暖事件和提前融雪频率的预计增加，在日本温带大雪森林中，林下植被可能比地上乔木受益更多。
The occurrence of extreme warm events and early snowmelt is predicted to increase in high‐latitude ecosystems, even during periods of time when there is no coincident reduction in total precipitation. However, because extreme events like these occur unpredictably, little is known about how advancing snowmelt by a single extreme warm event, without a reduction in precipitation amount, influences overstory trees and understory vegetation simultaneously in an ecosystem. We conducted a warming experiment (four 20 × 20 m plots) in temperate forests of Japan to determine the effects of earlier snowmelt on both understory dwarf bamboo plants and overstory birch trees. Our experimental treatment advanced snowmelt by about 10 days and increased soil temperatures that were associated with increased rates of soil nitrogen (N) mineralization and nitrification. Furthermore, these changes led to lower C:N ratios of leaves together with the greater growth of understory bamboo vegetation, with no changes in leaf C:N or growth rates of overstory birch trees. Together, our results demonstrate that advancing snowmelt by an extreme warm event in temperate forests is likely to affect N cycling and will benefit understory vegetation without a commensurate change in overstory vegetation, likely due to the increase in available soil N. These results also demonstrate that with the projected increase in the frequency of extreme warm events and advanced snowmelt, understory vegetation is likely to benefit more than overstory trees in Japanese temperate forests with heavy snow.
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影响因子：
3.7
作者：
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通讯作者：
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影响因子：
1.5
作者：
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DOI：
--
发表时间：
2016
期刊：
影响因子：
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作者：
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通讯作者：
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