Arid
DOI10.1016/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
ISSN1146-609X
EISSN1873-6238
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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