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Dwelling in the deep - strongly increased root growth and rooting depth enhance plant interactions with thawing permafrost soil

Blume-Werry, Gesche ; Milbau, Ann ; Teuber, Laurenz M. ; Johansson, Margareta LU and Dorrepaal, Ellen (2019) In New Phytologist 223(3). p.1328-1339
Abstract
Climate‐warming induced permafrost thaw exposes large amounts of carbon and nitrogen in soil at greater depths below the seasonally‐thawing active layer. The extent to which plant roots can reach and interact with these hitherto detached, deep carbon and nitrogen stores remains unknown. We aimed to quantify how permafrost thaw affects root dynamics across soil depths and plant functional types compared with aboveground abundance, and potential consequences for plant‐soil interactions. A decade of experimental permafrost thaw strongly increased total root length and growth in the active layer, and deep roots invaded the newly thawed permafrost underneath. Root litter input to soil across all depths was 10 times greater with permafrost thaw.... (More)
Climate‐warming induced permafrost thaw exposes large amounts of carbon and nitrogen in soil at greater depths below the seasonally‐thawing active layer. The extent to which plant roots can reach and interact with these hitherto detached, deep carbon and nitrogen stores remains unknown. We aimed to quantify how permafrost thaw affects root dynamics across soil depths and plant functional types compared with aboveground abundance, and potential consequences for plant‐soil interactions. A decade of experimental permafrost thaw strongly increased total root length and growth in the active layer, and deep roots invaded the newly thawed permafrost underneath. Root litter input to soil across all depths was 10 times greater with permafrost thaw. Root growth timing was unaffected by experimental permafrost thaw but peaked later in deeper soil, reflecting the seasonally receding thaw front. Deep‐rooting species could sequester 15N added at the base of the ambient active layer in October, which was after root growth had ceased. Deep soil organic matter that has long been locked‐up in permafrost is thus no longer detached from plant processes upon thaw. Whether via nutrient uptake, carbon storage, or rhizosphere priming, plant root interactions with thawing permafrost soils may feedback both positively and negatively onto our climate. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
New Phytologist
volume
223
issue
3
pages
12 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85067678476
  • pmid:31074867
ISSN
1469-8137
DOI
10.1111/nph.15903
language
English
LU publication?
yes
id
9c6f2b02-86f1-4df2-b135-ea2816ba077b
date added to LUP
2019-05-22 08:38:07
date last changed
2020-02-20 03:00:11
@article{9c6f2b02-86f1-4df2-b135-ea2816ba077b,
  abstract     = {Climate‐warming induced permafrost thaw exposes large amounts of carbon and nitrogen in soil at greater depths below the seasonally‐thawing active layer. The extent to which plant roots can reach and interact with these hitherto detached, deep carbon and nitrogen stores remains unknown. We aimed to quantify how permafrost thaw affects root dynamics across soil depths and plant functional types compared with aboveground abundance, and potential consequences for plant‐soil interactions. A decade of experimental permafrost thaw strongly increased total root length and growth in the active layer, and deep roots invaded the newly thawed permafrost underneath. Root litter input to soil across all depths was 10 times greater with permafrost thaw. Root growth timing was unaffected by experimental permafrost thaw but peaked later in deeper soil, reflecting the seasonally receding thaw front. Deep‐rooting species could sequester 15N added at the base of the ambient active layer in October, which was after root growth had ceased. Deep soil organic matter that has long been locked‐up in permafrost is thus no longer detached from plant processes upon thaw. Whether via nutrient uptake, carbon storage, or rhizosphere priming, plant root interactions with thawing permafrost soils may feedback both positively and negatively onto our climate.},
  author       = {Blume-Werry, Gesche and Milbau, Ann and Teuber, Laurenz M. and Johansson, Margareta and Dorrepaal, Ellen},
  issn         = {1469-8137},
  language     = {eng},
  number       = {3},
  pages        = {1328--1339},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Dwelling in the deep - strongly increased root growth and rooting depth enhance plant interactions with thawing permafrost soil},
  url          = {http://dx.doi.org/10.1111/nph.15903},
  doi          = {10.1111/nph.15903},
  volume       = {223},
  year         = {2019},
}