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	Optimizing manual sampling schedule for estimating annual soil CO2 efflux in a young exotic pine plantation in subtropical China
	Wang Y. D. ; Wang H. M. ; Wang Z. L. ; Zhang W. J. ; Guo C. C. ; Wen X. F. ; Liu Y. F.
	2012
关键词	Measurement strategy Optimization Sampling frequency Slash pine Soil respiration Subtropical forest interannual variation respiration measurements coniferous plantation precipitation pulses temporal resolution chamber system ponderosa pine forest temperature flux
英文摘要	Optimizing a manual measurement schedule (both frequency and pattern) for estimating annual soil respiration (R-S) is an important but unresolved issue. We hypothesized that (i) an optimal sampling setup can be found to obtain a reliable annual R-S, and (ii) if the desired outcome is a multi-year mean annual R-S, a lower sampling frequency might be adequate. Here we explored these issues using a three-year chamber-based dataset, with a sampling frequency of twice per week (defined as control), in an exotic slash pine (Pinus elliottii Englem.) plantation in subtropical China. The results showed that R-S during 9:00 -11:00 a.m. represented diurnal mean R-S well. In order to obtain an annual R-S as reliable as the control (deviation within +/- 5%), the optimal measurement strategy is a biweekly sampling across a year and not a trade-off sampling pattern (monthly sampling combined with weekly sampling depending on the seasons). Furthermore, despite an obvious inter-annual variability in R-S (548.4-757.5 g C m(-2) year(-1), CV = 16.3%), a monthly sampling was sufficient to obtain an unbiased multi-year mean annual R-S (deviation within +/- 5%). Such findings are useful when easy looking for estimates of annual ecosystem carbon budgets. However, the generality needs to be examined in other ecosystems. (C) 2012 Elsevier Masson SAS. All rights reserved.
出处	European Journal of Soil Biology
卷	52
页	41-47
收录类别	SCI
语种	英语
ISSN号	1164-5563
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30738]
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	Wang Y. D.,Wang H. M.,Wang Z. L.,et al. Optimizing manual sampling schedule for estimating annual soil CO2 efflux in a young exotic pine plantation in subtropical China. 2012.

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