In:
Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 41, No. 9 ( 2011-09), p. 1897-1906
Abstract:
Despite the significance of interannual variation of soil respiration (R S ) for understanding long-term soil carbon dynamics, factors that control the interannual variation of R S have not been sufficiently investigated. Interannual variation of R S was studied using a 6-year data set collected in a subtropical plantation dominated by an exotic species, slash pine (Pinus elliottii Engelm.), in China. The results showed that seasonal variation of R S was significantly affected by soil temperature and soil water content (SWC). R S in the dry season (July–October) was constrained by seasonal drought. Mean annual R S was estimated to be 736 ± 30 g C·m –2 ·year –1 , with a range of 706–790 g C·m –2 ·year –1 . Although this forest was characterized by a humid climate with high precipitation (1469 mm·year –1 ), the interannual variation of R S was attributed to the changes of annual mean SWC (R 2 = 0.66, P = 0.03), which was affected by annual rainfall frequency (R 2 = 0.80, P 〈 0.01) and not rainfall amount (P = 0.84). Consequently, precipitation pattern indirectly controlled the interannual variation of R S by affecting soil moisture in this subtropical forest. In the context of climate change, interannual variation of R S in subtropical ecosystems is expected to increase because of the predicted changes of precipitation regime.
Type of Medium:
Online Resource
ISSN:
0045-5067
,
1208-6037
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2011
detail.hit.zdb_id:
1473096-0
SSG:
23
SSG:
12
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