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	Contribution of aboveground litter to soil respiration in Populus davidiana Dode plantations at different stand ages
	Zhao X.; Li, F. D.; Zhang, W. J.; Ai, Z. P.
	2016
关键词	Aboveground litter Nonlinear equation Populus davidiana Dode Soil respiration Temperature sensitivity pinus-taeda l. co2 efflux organic-matter temperature sensitivity poplar plantations temporal variation virginia piedmont seasonal patterns deciduous forest tropical forests
英文摘要	Soil respiration from decomposing aboveground litter is a major component of the terrestrial carbon cycle. However, variations in the contribution of aboveground litter to the total soil respiration for stands of varying ages are poorly understood. To assess soil respiration induced by aboveground litter, treatments of litter and no litter were applied to 5-, 10-, and 20-year-old stands of Populus davidiana Dode in the sandstorm source area of Beijing-Tianjin, China. Optimal nonlinear equations were applied to model the combined effects of soil temperature and soil water content on soil respiration. Results showed that the monthly average contribution of aboveground litter to total soil respiration were 18.46% +/- 4.63%, 16.64% +/- 9.31%, and 22.37% +/- 8.17% for 5-, 10-, and 20-year-old stands, respectively. The relatively high contribution in 5- and 20-year-old stands could be attributed to easily decomposition products and high accumulated litter, respectively. Also, it fluctuated monthly for all stand ages due to substrate availability caused by phenology and environmental factors. Litter removal significantly decreased soil respiration and soil water content for all stand ages (p < 0.05) but not soil temperature (p > 0.05). Variations of soil respiration could be explained by soil temperature at 5-cm depth using an exponential equation and by soil water content at 10-cm depth using a quadratic equation, whereas soil respiration was better modeled using the combined parameters of soil temperature and soil water content than with either soil temperature or soil water content alone. Temperature sensitivity (Q(10)) increased with stand age in both the litter and the no litter treatments. Considering the effects of aboveground litter, this study provides insights for predicting future soil carbon fluxes and for accurately assessing soil carbon budgets.
出处	Journal of Mountain Science
卷	13
期	6
页	1000-1012
语种	英语
ISSN号	1672-6316
DOI标识	10.1007/s11620-015-3777-2
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42846]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhao X.,Li, F. D.,Zhang, W. J.,et al. Contribution of aboveground litter to soil respiration in Populus davidiana Dode plantations at different stand ages. 2016.

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