Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.actao.2014.11.008 |
Hydraulic properties and fine root mass of Larix sibirica along forest edge-interior gradients | |
Chenlemuge, Tselmeg; Dulamsuren, Choimaa; Hertel, Dietrich; Schuldt, Bernhard; Leuschner, Christoph; Hauck, Markus | |
通讯作者 | Hauck, Markus |
来源期刊 | ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
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ISSN | 1146-609X |
EISSN | 1873-6238 |
出版年 | 2015 |
卷号 | 63页码:28-35 |
英文摘要 | At its southernmost distribution limit in Inner Asia, the boreal forest disintegrates into forest fragments on moist sites (e.g. north-facing slopes), which are embedded in grasslands. This landscape mosaic is characterized by a much higher forest edge-to-interior ratio than in closed boreal forests. Earlier work in the forest-steppe ecotone of Mongolia has shown that Larix sibirica trees at forest edges grow faster than in the forest interior, as the more xeric environment at the edge promotes self-thinning and edges are preferentially targeted by selective logging and livestock grazing. Lowered stand density reduces competition for water in these semi-arid forests, where productivity is usually limited by summer drought. We studied how branch and coarse root hydraulic architecture and xylem conductivity, fine root biomass and necromass, and fine root morphology of L. sibirica respond to sites differing in water availability. Studying forest edge-interior gradients in two regions of western Mongolia, we found a significant reduction of branch theoretical (K-p) and empirical conductivity (K-s) in the putatively more drought-affected forest interior in the Mongolian Altai (mean precipitation: 120 mm yr(-1)), while no branch xylem modification occurred in the moister Khangai Mountains (215 mm yr(-1)). K-p and K-s were several times larger in roots than in branches, but root hydraulics were not influenced by stand density or mean annual precipitation. Very low fine root biomass: necromass ratios at all sites, and in the forest interior in particular, suggest that L. sibirica seeks to maintain a relatively high root conductivity by producing large conduits, which results in high root mortality due to embolism during drought. Our results suggest that L. sibirica is adapted to the semi-arid climate at its southernmost distribution limit by considerable plasticity of the branch hydraulic system and a small but apparently dynamic fine root system. (C) 2015 Elsevier Masson SAS. All rights reserved. |
英文关键词 | Hydraulic architecture Xylem anatomy Tree-ring width Fine root mass Stem density Coarse roots |
类型 | Article |
语种 | 英语 |
国家 | Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000351652800005 |
WOS关键词 | SCOTS PINE ; XYLEM EMBOLISM ; DROUGHT ; BIOMASS ; GROWTH ; CARBON ; CLIMATE ; TREES ; STAND ; CONDUCTIVITY |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/185416 |
作者单位 | Univ Gottingen, Albrecht Von Haller Inst Plant Sci, Plant Ecol, D-37073 Gottingen, Germany |
推荐引用方式 GB/T 7714 | Chenlemuge, Tselmeg,Dulamsuren, Choimaa,Hertel, Dietrich,et al. Hydraulic properties and fine root mass of Larix sibirica along forest edge-interior gradients[J],2015,63:28-35. |
APA | Chenlemuge, Tselmeg,Dulamsuren, Choimaa,Hertel, Dietrich,Schuldt, Bernhard,Leuschner, Christoph,&Hauck, Markus.(2015).Hydraulic properties and fine root mass of Larix sibirica along forest edge-interior gradients.ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY,63,28-35. |
MLA | Chenlemuge, Tselmeg,et al."Hydraulic properties and fine root mass of Larix sibirica along forest edge-interior gradients".ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 63(2015):28-35. |
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