Changes in alpine snowbed-wetland vegetation over three decades in northern Norway
Changes in alpine snowbed-wetland vegetation over three decades in northern Norway
复制标题
挪威北部高山雪床湿地植被三十年来的变化
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Odland
中科院分区：
文献类型：
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作者：
S. M. Sandvik;A. Odland
我们量化了高山雪床和湿地植被在三十年的植物区系变化，并分析了这些变化在多大程度上与积雪覆盖时间和地下水位距离的初始变化有关。沿沿着三个样带在北方挪威维管植物物种丰富度和总植物覆盖估计。三个不同的植被带被确定为沿着原始样带：相对干燥的雪床，湿雪床和湿地。物种丰富度和植被覆盖率的重大变化。总的来说，物种是净迁入的，新发现13种，5种低覆盖的稀有物种消失。在干燥和潮湿的雪床中，物种丰富度和总植物覆盖度增加，主要是因为灌木，禾本科和草本植物的入侵。总的趋势是，表明土壤湿度高的物种大幅减少。在湿地区系没有显着的变化，但喜湿的物种减少，并取代了禾本科和灌木物种，较低的水分需求。这些植物区系的变化与积雪和土壤水分条件有关，是影响变化速度和方向的重要因素。对比植被的反应在很短的距离内表现出的实际微生境的详细知识的重要性时，气候变化在高山生境的影响被认为是。
We have quantified floristic changes in alpine snowbeds and wetland vegetation during three decades and analyzed to what extent these changes are related to initial variations in snow cover duration and distance to groundwater level. Vascular plant species richness and total plant cover were estimated along three transects in northern Norway. Three different vegetation zones were identified along the original transects: relatively dry snowbeds, wet snowbeds and wetlands. The resampling shows major changes in species richness and plant cover. In general, there was a net immigration of species and 13 new species were found. Five rare species with initial low cover were lost. In the dry and wet snowbeds, species richness and total plant cover increased, mostly because of invasion by shrubs, graminoids and herbs. A general trend was that species indicating high soil moisture were strongly reduced. In the wetland zones there were no significant floristic changes but hygrophilous species had decreased and were replaced by graminoids and shrub species with lower water requirements. These floristic changes were significantly related to snow and soil moisture conditions, important factors for rate and direction of change. Contrasting vegetation responses within very short distances demonstrate the importance of detailed knowledge of the actual microhabitats when effects of climate change in alpine habitats are considered.