Biogenic silica accumulation varies across tussock tundra plant functional type
Biogenic silica accumulation varies across tussock tundra plant functional type
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不同草丛苔原植物功能类型的生物硅积累量有所不同
DOI：
10.1111/1365-2435.12912
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发表时间：
2017
影响因子：
5.2
通讯作者：
Power, Sally
中科院分区：
文献类型：
--
作者：
Carey, Joanna C.;Parker, Thomas C.;Fetcher, Ned;Tang, Jianwu;Power, Sally
陆地植被积累二氧化硅（SiO2）是生物二氧化硅循环的重要组成部分，因为它提高了植物的整体适应性，并影响了二氧化硅从陆地系统向海洋系统的输出速率。然而，大多数关于植物中二氧化硅的研究都集中在农业和森林生态系统上，对北极陆源二氧化硅循环以及气候变化对二氧化硅循环的潜在影响的了解严重缺乏。我们对美国阿拉斯加中部和北部横跨300公里纬度梯度的三个潮湿酸性苔原（MAT）站点的地上和地下部分的生物源二氧化硅（BSi）积累进行了量化。我们还研究了在北极发现的三种主要冻土带类型（MAT，潮湿非酸性冻土带和潮湿莎草冻土带（WST））中的植物二氧化硅积累。在三个主要站点上，形成丛丛的莎草（eriophorum vaginatum）中的生物源二氧化硅浓度差异不显著（p< 0.05）。禾本科禾本科植物的BSi含量最高（0.55±0.07%），而禾本科禾本科植物的BSi含量为0.27±0.01%。阴道横跨三个MAT部位)。灌丛间冻土带物种和灌木的BSi浓度均显著降低。vaginatum。我们的研究结果揭示了气候变暖导致的植被覆盖变化如何改变苔原植被中二氧化硅的储存。我们的计算表明，由于灌丛苔原的高生物量，变暖导致的灌木扩张将增加北极陆地植物的BSi储量，而通过永久冻土融化将丛苔原转化为WST将在陆地植物的BSi库中产生相反的效果。陆地植被二氧化硅储层大小的这种变化可能对二氧化硅向北极接收水域输送的速率和时间产生直接影响。本文提供了一个简单的语言摘要。
Silica (SiO2) accumulation by terrestrial vegetation is an important component of the biological silica cycle because it improves overall plant fitness and influences export rates of silica from terrestrial to marine systems. However, most research on silica in plants has focused on agricultural and forested ecosystems, and knowledge of terrestrial silica cycling in the Arctic, as well as the potential impacts of climate change on the silica cycle is severely lacking.We quantified biogenic silica (BSi) accumulation in above and below‐ground portions of three moist acidic tundra (MAT) sites spanning a 300 km latitudinal gradient in central and northern Alaska, USA. We also examined plant silica accumulation across three main tundra types found in the Arctic (MAT, moist non‐acidic tundra and wet sedge tundra (WST)).Biogenic silica concentrations in liveEriophorum vaginatum, a tussock‐forming sedge that is the foundation species of tussock tundra, were not significantly (p<.05) different across the three main sites. Concentrations of BSi in live above‐ground tissue were highest in the graminoid species (0.55 ± 0.07% BSi in sedges from WST, and 0.27 ± 0.01% inE. vaginatumacross the three MAT sites). Both inter‐tussock tundra species and shrubs contained substantially lower BSi concentrations thanE. vaginatum.Our results have implications for how shifts in vegetation cover associated with climatic warming may alter silica storage in tussock tundra vegetation. Our calculations suggest that shrub expansion via warming will increase BSi storage in Arctic land plants due to the higher biomass associated with shrub tundra, whereas conversion of tussock tundra to WST via permafrost thaw would produce the opposite effect in the terrestrial plant BSi pool. Such changes in the size of the terrestrial vegetation silica reservoir could have direct consequences for the rates and timing of silica delivery to receiving waters in the Arctic.A plain language summary is available for this article.
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加拿大中部北极永久冻土中的无定形硅库以及气候变化的潜在影响
影响因子：
4
作者：
Hanna Alfredsson;G. Hugelius;W. Clymans;J. Stadmark;P. Kuhry;D. Conley
通讯作者：
D. Conley
北方湿地中存在巨大的无定形二氧化硅库存
影响因子：
--
作者：
E. Struyf;C. Mörth;C. Humborg;D. Conley
通讯作者：
D. Conley
影响因子：
4
作者：
Carey, J. C.;Fulweiler, R. W.
通讯作者：
Fulweiler, R. W.
影响因子：
5.7
作者：
Frew, Adam;Allsopp, Peter G.;Johnson, Scott N.
通讯作者：
Johnson, Scott N.
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
梶野浩史;北島薫;Kaoru Kitajima & John J. Ewel
通讯作者：
Kaoru Kitajima & John J. Ewel