The unseen iceberg: plant roots in arctic tundra. Issue 1 (10th September 2014)

• Record Type: Journal Article
• Authors: Iversen, Colleen M.; Sloan, Victoria L.; Sullivan, Patrick F.; Euskirchen, Eugenie S.; McGuire, A. David; Norby, Richard J.; Walker, Anthony P.; Warren, Jeffrey M.; Wullschleger, Stan D.
• Is Part Of: New phytologist. Volume 205:Issue 1(2015)
• Page Start: 34
• Page End: 58
• Publication Date: 2014-09-10
• Subjects: Botany -- Periodicals; 580
• DOI: 10.1111/nph.13003
• Languages: English
• ISSNs: 0028-646X

Abstract

<abstract abstract-type="main" id="nph13003-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="nph13003-sec-0111" sec-type="section"> <title>Contents</title> <p> <table-wrap position="anchor" orientation="portrait"> <table width="100%" border="1"> <colgroup span="1"> <col span="1" /> <col span="1" /> <col span="1" /> </colgroup> <tbody> <tr> <td align="left" rowspan="1" colspan="1"> </td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0101" /> </td> <td align="left" rowspan="1" colspan="1">34</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">I.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0001">I.</xref> </td> <td align="left" rowspan="1" colspan="1">35</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">II.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0003">II.</xref> </td> <td align="left" rowspan="1" colspan="1">35</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">III.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0004">III.</xref> </td> <td align="left" rowspan="1" colspan="1">41</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">IV.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0005">IV.</xref> </td> <td align="left" rowspan="1" colspan="1">43</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">V.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0012">V.</xref> </td> <td align="left" rowspan="1" colspan="1">49</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">VI.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0013">VI.</xref> </td> <td align="left" rowspan="1" colspan="1">50</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">VII.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0014">VII.</xref> </td> <td align="left" rowspan="1" colspan="1">51</td> </tr> <tr> <td align="left" rowspan="1" colspan="1">VIII.</td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0015">VIII.</xref> </td> <td align="left" rowspan="1" colspan="1">52</td> </tr> <tr> <td align="left" rowspan="1" colspan="1"> </td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-sec-0016" /> </td> <td align="left" rowspan="1" colspan="1">53</td> </tr> <tr> <td align="left" rowspan="1" colspan="1"> </td> <td align="left" rowspan="1" colspan="1"> <xref ref-type="link" rid="nph13003-bibl-0001">References</xref> </td> <td align="left" rowspan="1" colspan="1">53</td> </tr> </tbody> </table> </table-wrap> </p> </sec> <sec id="nph13003-sec-0101" sec-type="section"> <title>Summary</title> <p>Plant roots play a critical role in ecosystem function in arctic tundra, but root dynamics in these ecosystems are poorly understood. To address this knowledge gap, we synthesized available literature on tundra roots, including their distribution, dynamics and contribution to ecosystem carbon and nutrient fluxes, and highlighted key aspects of their representation in terrestrial biosphere models. Across all tundra ecosystems, belowground plant biomass exceeded aboveground biomass, with the exception of polar desert tundra. Roots were shallowly distributed in the thin layer of soil that thaws annually, and were often found in surface organic soil horizons. Root traits – including distribution, chemistry, anatomy and resource partitioning – play an important role in controlling plant species competition, and therefore ecosystem carbon and nutrient fluxes, under changing climatic conditions, but have only been quantified for a small fraction of tundra plants. Further, the annual production and mortality of fine roots are key components of ecosystem processes in tundra, but extant data are sparse. Tundra root traits and dynamics should be the focus of future research efforts. Better representation of the dynamics and characteristics of tundra roots will improve the utility of models for the evaluation of the responses of tundra ecosystems to changing environmental conditions.</p> </sec> </abstract>