Element stoichiometry and nutrient limitation in bog plant and lichen species
Element stoichiometry and nutrient limitation in bog plant and lichen species
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DOI：
10.1007/s10533-022-00968-y
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发表时间：
2022-08-29
期刊：
影响因子：
4
通讯作者：
Wieder，R. Kelman
中科院分区：
文献类型：
--
作者：
Wieder，R. Kelman
全营养沼泽接收新的输入元素仅通过大气沉积，除了N的输入主要是通过N2固定，至少在低N沉积环境。在地球仪的不同位置，包括加拿大阿尔伯塔北方的阿萨巴斯卡油砂区（AOSR），由于人类活动，元素大气沉积增加。区域和/或全球沉积梯度提供了一个机会来研究与营养限制和元素化学计量有关的问题，即，尽管元素沉积/可用性不同，但沼泽地衣/植物组织中元素比率相对恒定。使用数据集的组织元素浓度在8个地衣/植物物种在6个AOSR沼泽，补充从全球其他网站的文献数据，这种合成问：是否有证据表明，在地衣或植物物种在AOSR沼泽的元素化学计量稳态，如果是这样，化学计量稳态关系扩展到全球范围内的AOSR，和，元素比提供洞察元素限制的8个物种？平均元素比值和它们的变异系数，三元NPK和CaMgK图，和缩放系数揭示了广泛的证据化学计量的稳态。化学计量关系一般不受AOSR沼泽中元素沉积差异的影响。化学计量关系有时会扩展到一个物种的全球范围，但有时不会。元素比值和三元图表明，N-，P-和K-限制的组合，无论是内部和外部的AOSR沼泽。区域性高大气氮沉降可能已经将某些物种从工业革命前的氮限制转变为今天的磷或钾限制。
Ombrotrophic bogs receive new inputs of elements solely through atmospheric deposition, except for N where inputs are predominantly through N2-fixation, at least in low N deposition environments. At various locations across the globe, including the Athabasca Oil Sands Region (AOSR) of northern Alberta, Canada, element atmospheric deposition has increased as a result of anthropogenic activities. Regional and/or global deposition gradients offer an opportunity to examine questions related to nutrient limitation and element stoichiometry, i.e., the maintenance of relatively constant element ratios in bog lichen/plant tissues despite differing element deposition/availability. Using a dataset of tissue element concentrations in eight lichen/plant species in six AOSR bogs, supplemented with literature data from other sites globally, this synthesis asks: is there evidence of element stoichiometric homeostasis in lichen or plant species in AOSR bogs; if so, do stoichiometric homeostasis relationships extend globally beyond the AOSR, and; do element ratios provide insight into element limitation for the eight species? Mean element ratios and their coefficients of variation, ternary NPK and CaMgK plots, and scaling coefficients revealed widespread evidence of stoichiometric homeostasis. Stoichiometric relationships generally were unaffected by differences in element deposition among the AOSR bogs. Stoichiometric relationships sometimes extended to a species globally, but sometimes did not. Element ratios and ternary diagrams suggested a combination of N-, P-, and K-limitation, both within and beyond the AOSR bogs. Regionally high atmospheric N deposition may have shifted some species from N-limitation prior to the Industrial Revolution to P- or K-limitation today.