Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet
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景观对养分化学计量的控制调节格陵兰冰盖边缘的湖泊初级生产
DOI：
10.1007/s10021-021-00693-x
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Prater C
中科院分区：
文献类型：
--
作者：
Prater C
全球变化正在重塑整个北极的自然环境并改变营养动态。这些变化可以影响生物群落的结构和功能，并影响湖泊等生物地球化学处理热点地区与气候相关的重要反馈（例如碳（C）固存）。为了了解这些生态系统在未来将如何反应，这项研究研究了格陵兰岛西南部冰原环境梯度上近期（<10年）和长期（1000年）自养生产的变化。当代湖泊温度和光照水平随着距冰盖距离的增加而增加，溶解有机碳（DOC）浓度和总氮：总磷（TN：TP）比率也随之增加。以生物硅积累率（BSiAR）和硅藻对微生物群落贡献衡量的硅藻产量在这些梯度范围内下降，而使用碳积累率和δ13C估计的总产量增加，表明本土生产和碳埋藏受该地区理化梯度上微生物竞争和竞争性位移的控制。公元 1800 年之前，各湖泊的硅藻产量普遍较低，但从公元 1750 年至 1880 年开始，硅藻产量已比背景水平高出 1.5-3 倍。这些增长早于当代区域变暖 115-250 年，并且初级生产的温度刺激与上个千年 90% 的古记录不一致。相反，初级生产似乎与氮和磷的可用性密切相关，由于湖泊景观位置、冰川活动和大气养分沉积程度的不同，该地区的氮和磷的可用性存在很大差异。这些结果表明，对营养供应增加的生物反应可以作为对全球变化的重要负反馈。
Global change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing hot spots such as lakes. To understand how these ecosystems will respond in the future, this study examined recent (< 10 y) and long-term (1000 y) shifts in autotrophic production across paraglacial environmental gradients in SW Greenland. Contemporary lake temperatures and light levels increased with distance from the ice sheet, along with dissolved organic C (DOC) concentrations and total nitrogen:total phosphorus (TN:TP) ratios. Diatom production measured as biogenic silica accumulation rates (BSiARs) and diatom contribution to microbial communities declined across these gradients, while total production estimated using C accumulation rates and δ13C increased, indicating that autochthonous production and C burial are controlled by microbial competition and competitive displacement across physiochemical gradients in the region. Diatom production was generally low across lakes prior to the 1800’s AD but has risen 1.5–3× above background levels starting between 1750 and 1880 AD. These increases predate contemporary regional warming by 115–250 years, and temperature stimulation of primary production was inconsistent with paleorecords for ~ 90% of the last millennium. Instead, primary production appeared to be more strongly related to N and P availability, which differs considerably across the region due to lake landscape position, glacial activity and degree of atmospheric nutrient deposition. These results suggest that biological responses to enhanced nutrient supply could serve as important negative feedbacks to global change.
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DOI：
10.1657/aaar0015-003
发表时间：
2016-02
期刊：
Arctic, Antarctic, and Alpine Research
影响因子：
--
作者：
E. Whiteford;Suzanne McGowan;Suzanne McGowan;Christopher D. Barry;N. Anderson
通讯作者：
E. Whiteford;Suzanne McGowan;Suzanne McGowan;Christopher D. Barry;N. Anderson
影响因子：
4.3
作者：
Beare, RJ;MacVean, MK;Sullivan, P
通讯作者：
Sullivan, P
影响因子：
3.4
作者：
Paltan, Homero;Dash, Jadu;Edwards, Mary
通讯作者：
Edwards, Mary
自末次冰期以来格陵兰冰盖的历史
影响因子：
2.3
作者：
Norman W. Ten Brink;A. Weidick
通讯作者：
A. Weidick
格陵兰岛冰川行为和冰川质量平衡研究——综述
影响因子：
1.5
作者：
A. Weidick
通讯作者：
A. Weidick