Warming increases the sensitivity of seedling growth capacity to rainfall in six temperate deciduous tree species.
Warming increases the sensitivity of seedling growth capacity to rainfall in six temperate deciduous tree species.
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DOI：
10.1093/aobpla/ply003
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发表时间：
2018-03
期刊：
影响因子：
2.9
通讯作者：
Dukes JS
中科院分区：
文献类型：
--
作者：
Rodgers VL;Smith NG;Hoeppner SS;Dukes JS
在美国东北部的一个老农田生态系统中，我们使用一个完全析因的降水变暖实验，研究了六种本土树种幼苗的气候敏感性。温暖和干燥的条件下抑制幼苗生长，但影响不同的物种增加死亡率，提高草食动物或减少叶面碳吸收率。我们的研究结果表明，在美国东北部，在未来温暖的环境中，干燥的年份可能会对早期次生演替森林的生长能力产生破坏性影响，通过物种特异性影响叶生产，草食动物和死亡率。预测气候变化对树种和群落的影响对于了解我们森林生态系统的未来状态至关重要。我们在美国东北部的一个老农田生态系统中使用了一个完全析因的降水（三个水平;环境温度，-50%环境温度，+50%环境温度）和变暖（四个水平;高达+4 °C）实验，以研究六种本土树种幼苗的气候敏感性。我们测量了整个植物水平的反应：生存，总叶面积（TLA），幼苗昆虫植食性损害，以及叶水平的反应：比叶面积（SLA），叶水平含水量（LWC），叶片氮（N）浓度，叶片碳（C）浓度和C：N比的每一个这些落叶物种在每个处理在一个单一的生长季节。我们发现，冠层变暖显着增加了所有物种的植物生长（TLA测量）降雨的敏感性。温暖、干燥的条件持续降低TLA，也降低了四个物种（红槭、桦、李、美洲榆）的叶片C：N，主要是由于叶片C减少，而不是叶片N增加。有趣的是，这些条件也以不同的方式伤害了其他两个物种，增加了死亡率（大齿杨）或食草动物（红栎）。比叶面积和LWC因物种而异，但没有表现出强烈的治疗反应。我们的研究结果表明，在美国东北部，在未来温暖的环境中，干燥的年份可能会对这些早期次生演替森林的生长能力产生破坏性影响，通过种属特异性影响叶生产（总叶和叶C），食草动物和死亡率。
Using a fully factorial precipitation by warming experiment in an old-field ecosystem in the northeastern USA we studied the climatic sensitivity of seedlings of six native tree species. Warm and dry conditions suppressed seedling growth, but affected species differently by increasing mortality, enhancing rates of herbivory or decreasing foliar carbon uptake. Our results indicate that, in the northeastern USA, dry years in a future warmer environment could have damaging effects on the growth capacity of early secondary successional forests, through species-specific effects on leaf production, herbivory and mortality. Predicting the effects of climate change on tree species and communities is critical for understanding the future state of our forested ecosystems. We used a fully factorial precipitation (three levels; ambient, −50 % ambient, +50 % ambient) by warming (four levels; up to +4 °C) experiment in an old-field ecosystem in the northeastern USA to study the climatic sensitivity of seedlings of six native tree species. We measured whole plant-level responses: survival, total leaf area (TLA), seedling insect herbivory damage, as well as leaf-level responses: specific leaf area (SLA), leaf-level water content (LWC), foliar nitrogen (N) concentration, foliar carbon (C) concentration and C:N ratio of each of these deciduous species in each treatment across a single growing season. We found that canopy warming dramatically increased the sensitivity of plant growth (measured as TLA) to rainfall across all species. Warm, dry conditions consistently reduced TLA and also reduced leaf C:N in four species (Acer rubrum, Betula lenta, Prunus serotina, Ulmus americana), primarily as a result of reduced foliar C, not increased foliar N. Interestingly, these conditions also harmed the other two species in different ways, increasing either mortality (Populus grandidentata) or herbivory (Quercus rubra). Specific leaf area and LWC varied across species, but did not show strong treatment responses. Our results indicate that, in the northeastern USA, dry years in a future warmer environment could have damaging effects on the growth capacity of these early secondary successional forests, through species-specific effects on leaf production (total leaves and leaf C), herbivory and mortality.
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影响因子：
2.3
作者：
Aspelmeier, S;Leuschner, C
通讯作者：
Leuschner, C
影响因子：
56.9
作者：
Chen, I-Ching;Hill, Jane K.;Thomas, Chris D.
通讯作者：
Thomas, Chris D.
影响因子：
3.7
作者：
Iverson, Louis R.;Prasad, Anantha M.;Peters, Matthew
通讯作者：
Peters, Matthew
DOI：
10.1073/pnas.1010070108
发表时间：
2011-01-25
影响因子：
11.1
作者：
Carnicer, Jofre;Coll, Marta;Penuelas, Josep
通讯作者：
Penuelas, Josep
影响因子：
3.7
作者：
Allen, Craig D.;Macalady, Alison K.;Cobb, Neil
通讯作者：
Cobb, Neil