Variation in Fine Root Characteristics and Nutrient Dynamics Across Alaskan Ecosystems
Variation in Fine Root Characteristics and Nutrient Dynamics Across Alaskan Ecosystems
复制标题
阿拉斯加生态系统细根特征和养分动态的变化
DOI：
10.1007/s10021-020-00583-8
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发表时间：
2020
期刊：
影响因子：
3.7
通讯作者：
Loranty, Michael M.
中科院分区：
文献类型：
--
作者：
McCulloch, Lindsay A.;Kropp, Heather;Kholodov, Alexander;Cardelús, Catherine L.;Natali, Susan M.;Loranty, Michael M.
高纬度生态系统中与快速变暖相关的碳循环扰动可能会对全球气候产生影响。地下生物量是这些生态系统碳循环的重要组成部分，平均而言，地下植被生物量明显多于地上。由于分解速度缓慢，这些生态系统中还存在大量死根生物量。由于数据收集的劳动和时间密集性，目前对高纬度生态系统中活根和死根生物量碳库如何变化以及与这种变化相关的环境条件的了解有限。为此，我们研究了阿拉斯加纬度梯度上 23 个地点的活细根生物量 (FRB) 和死细根生物量 (FRB) 以及 FRB 碳 (C)、氮 (N) 和磷浓度变化相关的模式和因素（非生物和生物），涵盖北方森林和苔原生物群落。我们发现这些生物群落之间的活或死 FRB 变量没有差异，尽管主要植被类型存在很大差异，但北方地区活 FRB C:N 比率显着较高。土壤碳氮比、湿度和温度以及苔藓覆盖解释了不同地点死活 FRB 比率变异的很大一部分。我们发现所有这些因素都与死快速射电暴呈负相关，而与活快速射电暴呈正相关或无相关。这项工作表明，FRB 不一定与地上植被特征相关，并且强调需要对非生物和生物因素进行更精细的测量，以了解现在和未来的 FRB 景观变化。
Carbon cycle perturbations in high-latitude ecosystems associated with rapid warming can have implications for the global climate. Belowground biomass is an important component of the carbon cycle in these ecosystems, with, on average, significantly more vegetation biomass belowground than aboveground. Large quantities of dead root biomass are also in these ecosystems owing to slow decomposition rates. Current understanding of how live and dead root biomass carbon pools vary across high-latitude ecosystems and the environmental conditions associated with this variation is limited due to the labor- and time-intensive nature of data collection. To that end, we examined patterns and factors (abiotic and biotic) associated with the variation in live and dead fine root biomass (FRB) and FRB carbon (C), nitrogen (N) and phosphorus concentrations for 23 sites across a latitudinal gradient in Alaska, spanning both boreal forest and tundra biomes. We found no difference in the live or dead FRB variables between these biomes, despite large differences in predominant vegetation types, except for significantly higher live FRB C:N ratios in boreal sites. Soil C:N ratio, moisture, and temperature, along with moss cover, explained a substantial portion of the dead:live FRB ratio variability across sites. We find all these factors have negative relationships with dead FRB, while having positive or no relationship with live FRB. This work demonstrates that FRB does not necessarily correlate with aboveground vegetation characteristics, and it highlights the need for finer-scale measurements of abiotic and biotic factors to understand FRB landscape variability now and into the future.
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影响因子：
30.7
作者：
Hartley, Iain P.;Garnett, Mark H.;Wookey, Philip A.
通讯作者：
Wookey, Philip A.
影响因子：
6.7
作者：
Berner, Logan T.;Jantz, Patrick;Goetz, Scott J.
通讯作者：
Goetz, Scott J.
影响因子：
3.4
作者：
JONASSON, S
通讯作者：
JONASSON, S
影响因子：
6.1
作者：
Evgrafova, Alevtina;de la Haye, Tilman Rene;Spielvogel, Sandra
通讯作者：
Spielvogel, Sandra
北方森林和苔原
DOI：
10.1007/978-94-011-1982-5_3
发表时间：
1993
期刊：
Water, Air, and Soil Pollution
影响因子：
--
作者：
M. Apps;W. Kurz;R. Luxmoore;L. Nilsson;R. Sedjo;R. Schmidt;L. G. Simpson;T. Vinson
通讯作者：
T. Vinson