Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2003361117 |
Peatland warming strongly increases fine-root growth | |
Avni Malhotra; Deanne J. Brice; Joanne Childs; Jake D. Graham; Erik A. Hobbie; Holly Vander Stel; Sarah C. Feron; Paul J. Hanson; Colleen M. Iversen | |
2020-07-13 | |
发表期刊 | Proceedings of the National Academy of Sciences |
出版年 | 2020 |
英文摘要 | Belowground climate change responses remain a key unknown in the Earth system. Plant fine-root response is especially important to understand because fine roots respond quickly to environmental change, are responsible for nutrient and water uptake, and influence carbon cycling. However, fine-root responses to climate change are poorly constrained, especially in northern peatlands, which contain up to two-thirds of the world’s soil carbon. We present fine-root responses to warming between +2 °C and 9 °C above ambient conditions in a whole-ecosystem peatland experiment. Warming strongly increased fine-root growth by over an order of magnitude in the warmest treatment, with stronger responses in shrubs than in trees or graminoids. In the first year of treatment, the control (+0 °C) shrub fine-root growth of 0.9 km m−2 y−1 increased linearly by 1.2 km m−2 y−1 (130%) for every degree increase in soil temperature. An extended belowground growing season accounted for 20% of this dramatic increase. In the second growing season of treatment, the shrub warming response rate increased to 2.54 km m−2 °C−1. Soil moisture was negatively correlated with fine-root growth, highlighting that drying of these typically water-saturated ecosystems can fuel a surprising burst in shrub belowground productivity, one possible mechanism explaining the “shrubification” of northern peatlands in response to global change. This previously unrecognized mechanism sheds light on how peatland fine-root response to warming and drying could be strong and rapid, with consequences for the belowground growing season duration, microtopography, vegetation composition, and ultimately, carbon function of these globally relevant carbon sinks. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/284295 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Avni Malhotra,Deanne J. Brice,Joanne Childs,et al. Peatland warming strongly increases fine-root growth[J]. Proceedings of the National Academy of Sciences,2020. |
APA | Avni Malhotra.,Deanne J. Brice.,Joanne Childs.,Jake D. Graham.,Erik A. Hobbie.,...&Colleen M. Iversen.(2020).Peatland warming strongly increases fine-root growth.Proceedings of the National Academy of Sciences. |
MLA | Avni Malhotra,et al."Peatland warming strongly increases fine-root growth".Proceedings of the National Academy of Sciences (2020). |
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