Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.
Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.
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在亚北极景观中，冠层形成物种的根际分配主导着土壤二氧化碳流出。
DOI：
10.1111/nph.16573
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Parker TC
中科院分区：
文献类型：
--
作者：
Parker TC
在北极生态系统中，气候变化提高了植物的生产力。由于北极碳（C）储量主要位于地下，植物生产力的提高对土壤C储量的影响将显著决定这些生态系统的净汇/源潜力，但植被对土壤CO2排放的控制仍不清楚。为了确定冠层形成物种在地下C动态中的作用，我们进行了一个环剥试验，试验区分布在1平方公里的桦树林线上毛桦林与杨柳（Salix lapponum）斑块在瑞典北方和量化的贡献冠层植被土壤CO2通量和地下生产力生长高峰期的CO2排放量减少了53%，这是预期量的两倍，因为树木只占森林总叶面积的一半。根和菌根菌丝产量也大幅下降。研究结果表明，在土壤呼吸高峰期，杨柳灌木对斑块内土壤CO2排放的贡献率为38%，而新近被乔木和高灌木固定的碳对土壤呼吸的贡献率较大。至关重要的是，在绿化北极的背景下考虑到这些过程，因为生产力和生态系统固碳不是同义词。
In arctic ecosystems, climate change has increased plant productivity. As arctic carbon (C) stocks predominantly are located belowground, the effects of greater plant productivity on soil C storage will significantly determine the net sink/source potential of these ecosystems, but vegetation controls on soil CO2efflux remain poorly resolved.In order to identify the role of canopy‐forming species in belowground C dynamics, we conducted a girdling experiment with plots distributed across 1 km2of treeline birch (Betula pubescens) forest and willow (Salix lapponum) patches in northern Sweden and quantified the contribution of canopy vegetation to soil CO2fluxes and belowground productivity.Girdling birches reduced total soil CO2efflux in the peak growing season by 53%, which is double the expected amount, given that trees contribute only half of the total leaf area in the forest. Root and mycorrhizal mycelial production also decreased substantially. At peak season, willow shrubs contributed 38% to soil CO2efflux in their patches.Our findings indicate that C, recently fixed by trees and tall shrubs, makes a substantial contribution to soil respiration. It is critically important that these processes are taken into consideration in the context of a greening arctic because productivity and ecosystem C sequestration are not synonymous.
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影响因子：
30.7
作者：
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通讯作者：
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影响因子：
6.7
作者：
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通讯作者：
P. Wookey