Biotic and Abiotic Factors Interact to Regulate Northern Peatland Carbon Cycling
Biotic and Abiotic Factors Interact to Regulate Northern Peatland Carbon Cycling
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DOI：
10.1007/s10021-015-9907-4
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发表时间：
2015-12-01
期刊：
影响因子：
3.7
通讯作者：
Whitaker, Jeanette
中科院分区：
文献类型：
--
作者：
Armstrong, Alona;Waldron, Susan;Whitaker, Jeanette
了解控制泥炭地碳(C)循环的时空变异性对于预测未来环境变化的影响至关重要。虽然人们对C自行车的单个司机有了了解，但多个司机的影响，包括相互作用，仍然知之甚少。利用一个时空清晰的采样框架，我们考察了生物和非生物控制对泥炭地功能的关键指标的影响：生态系统呼吸(R(ECO))、光合作用(P(CAL))、净生态系统交换(NEE)、甲烷(CH4)通量和孔隙水溶解有机碳浓度([DOC])。测量是在英国苏格兰一块沼泽泥炭地进行的，历时12个月。总体而言，我们发现(I)季节和植物功能类型(PFT)解释了R(ECO)和P(CAL)的最大变化，(Ii)PFT和风电场内的空间位置(综合了几个泥炭属性)是CH4通量的主要预测因子，(Iii)季节和风电场内的位置与孔隙水[DOC]相关。对预测因子的检验表明，生物和非生物因素之间和内部的相互作用解释了温室气体通量和[DOC]的显著变化。这些发现表明，生物和非生物因素的组合可能会中介或加剧未来环境变化对泥炭地C循环的影响。有鉴于此，碳循环的研究需要捕捉生物和非生物因素及其相互作用的时空变化，以预测环境变化可能产生的影响。
Understanding the spatio-temporal variability of controls on peatland carbon (C) cycling is essential to project the effects of future environmental change. While there is understanding of individual drivers of C cycling, the effect of multiple drivers, including interactions, remains poorly understood. Using a spatially and temporally explicit sampling framework, we examined the effects of biotic and abiotic controls on key indicators of peatland functioning: ecosystem respiration (R (eco)), photosynthesis (P (cal)), net ecosystem exchange (NEE), methane (CH4) fluxes, and pore water dissolved organic carbon concentration ([DOC]). Measurements were made over 12 months in a blanket peatland hosting a wind farm in Scotland, UK. Overall, we found that (i) season and plant functional type (PFT) explained most variation in R (eco) and P (cal), (ii) PFT and spatial location within the wind farm, which integrates several peat properties, were dominant predictors of CH4 fluxes, and (iii) season and location within the wind farm correlated with pore water [DOC]. Examination of predictors indicated that interactions, between and within biotic and abiotic factors, explained a significant amount of variation in greenhouse gas fluxes and [DOC]. These findings indicate that combinations of biotic and abiotic factors could mediate or exacerbate the effects of future environmental change on peatland C cycling. Given this, studies of C cycling need to capture the spatial and temporal variance of biotic and abiotic factors and their interactions to project the likely impacts of environmental change.