globalchange  > 影响、适应和脆弱性
DOI: 10.1088/1748-9326/11/8/085005
论文题名:
Greater effect of increasing shrub height on winter versus summer soil temperature
作者: Mélissa Paradis; Esther Lévesque; Stéphane Boudreau
刊名: Environmental Research Letters
ISSN: 1748-9326
出版年: 2016
发表日期: 2016-08-16
卷: 11, 期:8
语种: 英语
英文摘要:

Shrub expansion is increasingly observed in arctic and subarctic environments. The development of shrub structure may significantly impact the abiotic environment at the local scale. Our objective was to reconstruct the development of the vertical structure of Betula glandulosa Michx. and to evaluate its effects on winter and summer soil temperature and on snow depth. Stratified sampling of the shrub revealed that shrub biomass distribution followed a similar pattern in stands of contrasting heights. Woody biomass was maximal in the lower stratum and relatively stable in the intermediate strata, while the foliar biomass tracked the vertical development of the shrub structure. Dendrochronological analysis revealed that shrub stands are relatively young; most of the dominant stems started their development after 1990. Shrub height was positively associated with both the dominant stem age and its vertical growth rate. Temperature differences among sites were greater during winter (ca 10 °C) than during summer (ca 2 °C), while the sum of freezing degree-days varied from 680 °C to 2125 °C. Shrub height was the most plausible variable explaining snow depth, winter ground level temperature and the sum of freezing degree-days. However, woody biomass in the 30–40 cm strata best explained summer ground level temperature. Our results suggest that the development of a shrub structure will have far-reaching consequences on the abiotic environment of subarctic ecosystems.

URL: http://iopscience.iop.org/article/10.1088/1748-9326/11/8/085005
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13890
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Département de biologie, Université Laval, 1045 av. de la Médecine, Québec, Qc, G1V 0A6, Canada;Centre d’études nordiques, Université Laval, 2405 rue de la Terrasse, Québec, Qc, G1V 0A6, Canada;Centre d’études nordiques, Université Laval, 2405 rue de la Terrasse, Québec, Qc, G1V 0A6, Canada;Département des Sciences de l’environnement, Université du Québec à Trois-Rivières (UQTR), 3351 boul. des Forges, CP 500, Trois-Rivières, Qc, G9A 5H7, Canada;Département de biologie, Université Laval, 1045 av. de la Médecine, Québec, Qc, G1V 0A6, Canada;Centre d’études nordiques, Université Laval, 2405 rue de la Terrasse, Québec, Qc, G1V 0A6, Canada

Recommended Citation:
Mélissa Paradis,Esther Lévesque,Stéphane Boudreau. Greater effect of increasing shrub height on winter versus summer soil temperature[J]. Environmental Research Letters,2016-01-01,11(8)
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