Leaf isotopic (δ13C and δ15N) and nitrogen contents of Carex plants along the Eurasian Coastal Arctic: results from the Northeast Passage expedition
Leaf isotopic (δ13C and δ15N) and nitrogen contents of Carex plants along the Eurasian Coastal Arctic: results from the Northeast Passage expedition
复制标题
欧亚北极沿岸苔草植物的叶子同位素（δ13C 和 δ15N）和氮含量：东北航道探险的结果
DOI：
10.1007/s00300-003-0562-4
复制
发表时间：
2003
期刊：
影响因子：
1.7
通讯作者：
J. Fahnestock
中科院分区：
文献类型：
--
作者：
J. Welker;I. Jónsdóttir;J. Fahnestock
我们对欧亚海岸北极15个地点的苔草植物进行了替代原位生理性能测试(δ13C和δ15N)。苔草属植物的叶碳同位素识别(LCID)在不同地点(居群)之间存在显著差异。此外，LCID与年平均温度和气孔密度呈负相关，与解冻深度呈较小程度的负相关。苔草属植物的叶δ15N值在不同分株龄级之间存在显著差异，且叶δ15N值与年平均降水量呈负相关。这些覆盖欧亚北极的苔草树叶气体交换和矿物质营养的范围可能有助于苔草在沿海冻土带系统中的主导地位。此外，LCID、降水和温度之间的负相关表明，随着欧亚大陆降水量的增加和气温的持续变暖，未来叶片气体交换实际上可能会更低，从而导致新梢生长减少和地上生物量减少。
We conducted surrogate in-situ physiological performance measures (δ13C and δ15N) of Carex plants from 15 Eurasian Coastal Arctic sites. Leaf carbon isotope discrimination (LCID) of Carex plants exhibited significant differences between sites (populations). Additionally, LCID was inversely correlated with mean annual temperature and stomatal density, and to a lesser extent, with the depth of thaw. Leaf δ15N values of Carex plants exhibited significant differences between sites without differences among ramet age classes, and the leaf δ15N values were inversely correlated with mean annual precipitation. These ranges of Carex leaf gas exchange and mineral nutrition across the Eurasian Arctic may contribute to Carex’s dominance in coastal tundra systems. Also, the inverse correlation between LCID, precipitation, and temperature indicates that, as precipitation increases and temperatures continue to warm in Eurasia, leaf gas exchange may actually be lower in the future, leading to reductions in shoot growth and lower above-ground biomass production.