Photosynthetic characteristics and biomass distribution of the dominant vascular plant species in a high Arctic tundra ecosystem, Ny-Ålesund, Svalbard: implications for their role in ecosystem carbon gain
Photosynthetic characteristics and biomass distribution of the dominant vascular plant species in a high Arctic tundra ecosystem, Ny-Ålesund, Svalbard: implications for their role in ecosystem carbon gain
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DOI：
10.1007/s10265-007-0134-8
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发表时间：
2008-01
影响因子：
2.8
通讯作者：
H. Muraoka;H. Noda;M. Uchida;T. Ohtsuka;H. Koizumi;T. Nakatsubo
中科院分区：
文献类型：
--
作者：
H. Muraoka;H. Noda;M. Uchida;T. Ohtsuka;H. Koizumi;T. Nakatsubo
对北极高纬度地区陆地生态系统的研究主要集中在这些生态系统对全球环境变化的响应及其与生态系统功能有关的固碳能力。本文报道了在北极斯瓦尔巴特群岛（78.5°N，11.5°E）的纽勒松苔原生态系统中，对优势维管植物极毛柳（Salix polaris）、八瓣鱼藤（Dryas octopetala）和对叶虎耳草（Saxifraga oppositifolia）的光合特性和生物量分配进行的研究。我们还估计了净初级生产力（NPP）沿着由冰前年代序列和地形梯度所产生的演替梯度。光饱和光合速率（Amax）在不同物种之间存在差异，Sal的Amax约为124.1 nmol CO 2g − 1 leaf s− 1。polaris，57.8福特.八瓣花24.4;对生叶氮含量与叶片氮含量呈显著正相关。光合氮素利用效率以Sal.在Sax.对生叶Sal.的分布PolarisandD. Octopetala仅限于土壤养分有效性高的地区，而Sax. oppositifolia能够建立在冰川的前面，那里的养分供应量低，但往往是由其他维管植物在高养分地区占主导地位。净初级生产力反映了群落的光合能力和生物量的分配，随着演替的进行，净初级生产力增加; polarisreached达到as high高as 12 fold倍of Sax萨克斯.对生叶
Studies on terrestrial ecosystems in the high Arctic region have focused on the response of these ecosystems to global environmental change and their carbon sequestration capacity in relation to ecosystem function. We report here our study of the photosynthetic characteristics and biomass distribution of the dominant vascular plant species,Salix polaris,Dryas octopetalaandSaxifraga oppositifolia, in the high Arctic tundra ecosystem at Ny-Ålesund, Svalbard (78.5°N, 11.5°E). We also estimated net primary production (NPP) along both the successional gradient created by the proglacial chronosequence and the topographical gradient. The light-saturated photosynthesis rate (Amax) differed among the species, with approximately 124.1 nmol CO2g−1leaf s−1forSal. polaris, 57.8 forD. octopetalaand 24.4 forSax. oppositifolia, and was highly correlated with the leaf nitrogen (N) content for all three species. The photosynthetic N use efficiency was the highest inSal. polarisand lowest inSax. oppositifolia. Distributions ofSal. polarisandD. octopetalawere restricted to the area where soil nutrient availability was high, whileSax. oppositifoliawas able to establish at the front of a glacier, where nutrient availability is low, but tended to be dominated by other vascular plants in high nutrient areas. The NPP reflected the photosynthetic capacity and biomass distribution in that it increased with the successional status; the contribution ofSal. polarisreached as high as 12-fold that ofSax. oppositifolia.