Photosynthetic activity in three vascular species of Spitsbergen vegetation during summer season in response to microclimate
Photosynthetic activity in three vascular species of Spitsbergen vegetation during summer season in response to microclimate
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DOI：
10.2478/v10183-012-0018-z
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发表时间：
2012-01-01
影响因子：
1.3
通讯作者：
Hajek, Josef
中科院分区：
文献类型：
--
作者：
Bartak, Milos;Vaczi, Peter;Hajek, Josef
对北极冻土带3种优势种（Silene acaulis、Dryas octopetala、Salix polaris）的光合过程、光合电子传递率（ETR）进行了日测量。利用叶绿素荧光数据计算净光合作用（P-N）的日变化过程，并对日光合作用进行评价。短期野外测量分别于2009年夏季和2010年夏季进行。每5分钟测量一次荧光参数（Phi（PSII）和ETR），并分别测量10天（2009年）和8天（2010年）的小气候特征。在所有物种中，光合ETR与入射光合有效辐射和叶温密切相关。总的来说，章鱼龙的ETR略低于其他两个物种。北极星（s . polaris）、黄花海螺（s . acaulis）和章鱼海螺（D. octopetala）的最大光合速率（P-Nmax）分别为17.6、21.4和22.9 mu mol CO2 m(-2) s（-1）。所有物种的日光合作用都达到相当的值，但在阴天和晴天，d . otopetala的日光合作用值略低于其他两种物种(分别为3.9和13.4 mmol CO2 m（-2) d(-1)）。阴天条件下，北极星（S. polaris）和金穗（S. acaulis）的日光合作用范围分别为4.6 ~ 6.9和14.6 ~ 15.2 mmol CO2 m(-2) d（-1）。
Diurnal measurements of photosynthetic processes, effective quantum yield of photosystem II (Phi(PSII)), photosynthetic electron transport rate (ETR) were done in three dominant species of Arctic tundra (Silene acaulis, Dryas octopetala, Salix polaris) in Petunia-bukta, Spitsbergen. Daily courses of net photosynthesis (P-N) were calculated from chlorophyll fluorescence data and daily photosynthesis evaluated. The short-term field measurements were carried out in summer 2009, and 2010. Fluorometric parameters (Phi(PSII) and ETR) were measured each 5 minutes as well as microclimate characteristics of the site for 10 (2009) and 8 days (2010), respectively. In all species photosynthetic ETR was well related to incident photosynthetically active radiation and leaf temperature. In general, D. octopetala exhibited slightly lower ETR than the other two species. Estimated maximum photosynthetic rate (P-Nmax) reached 17.6, 21.4, and 22.9 mu mol CO2 m(-2) s(-1) for S. polaris, S. acaulis, and D. octopetala, respectively. Daily photosynthesis reached comparable values in all species, D. otopetala, however, exhibited slightly lower values than the other two species both for overcast and fully sunny days (3.9 and 13.4 mmol CO2 m(-2) d(-1), respectively). The range of daily photosynthesis for S. polaris and S. acaulis studied, reached the ranges of 4.6-6.9 and 14.6-15.2 mmol CO2 m(-2) d(-1) for overcast and fully sunny day, respectively.