Climate change effects on species interactions in an alpine plant community
Climate change effects on species interactions in an alpine plant community
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DOI：
10.1111/j.1365-2745.2004.00944.x
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发表时间：
2005-02-01
影响因子：
5.5
通讯作者：
Klanderud, K
中科院分区：
文献类型：
--
作者：
Klanderud, K
1我通过在挪威南部高山地区Finse的四个生长季节移除矮小灌木Dryas octopetala，研究了物种相互作用对草本植物唐松草和莎草种群动态的影响。此外，通过增加温度(开顶室)和养分可获得性(养分添加)，我评估了气候变暖对生物相互作用的影响。2移除Dryas增加了Thalictrum和Carex的叶片数量和开花频率。Thalictrum的花茎和叶柄，以及Carex的叶片，在仙女座被移除后明显变短。增温和添加养分促进了营养植物的生长，而单独增温对目标物种的有性繁殖努力有积极的影响。我们的结果表明，仙女木对其邻近区域既有营养竞争，又有促进庇护的作用。3种间相互作用影响了唐松属和苔草属植物的种群动态。研究表明，在全球变暖的情况下，如果温度，特别是养分的有效性增加，仙女木与邻近物种之间的相互作用可能会被改变。4本研究表明，生物相互作用和非生物环境条件都可能影响高山植物种群动态。此外，气候变化可能会改变物种间的相互作用。5气候变化实验和未来预测全球变暖下植物群落变化的模型中应包括物种间的相互作用。
1 I examined the role of species interactions on the population dynamics of the herb Thalictrum alpinum and the sedge Carex vaginata by removing the dwarf shrub Dryas octopetala over four growing seasons at Finse, in the alpine region of south Norway, Furthermore, by increasing temperature (open top chambers) and nutrient availability (nutrient addition), I assessed the effects of climate warming on biotic interactions.2 Dryas removal increased the number of Thalictrum and Carex leaves, and flowering frequency of Carex. Flower stems and leaf stalks of Thalictrum, and the leaves of Carex, became significantly shorter following Dryas removal. Warming and nutrient addition increased vegetative plant growth, whereas warming alone had positive effects on sexual reproductive effort of the target species. My results suggest that there is both competition for nutrients, and a facilitative shelter effect of Dryas on its neighbours.3 Species interactions affected population dynamics of Thalictrum and Carex. Interactions between the impacts of Dryas removal and abiotic factors on leaf production, suggested that interactions between Dryas and neighbouring species might be modified if temperature and, in particular, nutrient availability increase under global warming.4 This study shows that both biotic interactions and abiotic environmental conditions may affect alpine plant population dynamics. Furthermore, it shows that climate change may modify species interactions.5 Species interaction effects should be included in climate change experiments and in future models predicting plant community changes under global warming.