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	Assessing productivity and carbon sequestration capacity of subtropical coniferous plantations using the process model PnET-CN
	Yan Y. A. ; Wang S. Q. ; Wang Y. D. ; Wu W. X. ; Wang J. Y. ; Chen B. ; Yang F. T.
	2011
关键词	coniferous plantations PnET-CN Model validation foliar N concentration C sequestration forest ecosystem processes net primary production climate-change south china atmospheric deposition regional applications litter decomposition foliar respiration deciduous forests nutrient dynamics
英文摘要	A generalized, lumped-parameter ecological model PnET-CN was calibrated and validated for a subtropical coniferous plantation in southern China. PnET-CN model describes the biogeochemical cycles of carbon (C) and nitrogen (N) and can assist in estimating carbon sequestration potential. For validation of PnET-CN, data from coniferous forest plantations in southern China was used. Simulated daily gross primary productivity (GPP) from 2005 to 2007 agreed well with observations (R(2)=0.56, S.D.=0.009). Simulations of monthly soil respiration (R(s)) from 2005-2007 agreed well with R(s) observations (R(2)=0.67, S.D. =0.03). Simulated annual net primary productivity (NPP) from 1998-2006 was 803 33 gCm(-2)a(-1), about 4% higher than NPP observation (752 +/- 51 gCm(-2)a(-1)). Simulations of annual NEP from 2005-2007 only overestimate 9 gCm(-2)a(-1) (4%), 4 gCm(-2)a(-1) (1%) and 34 gCm(-2)a(-1) (8%) compared to NEP observations, respectively. Simulated annual foliar N concentration (FoINCon) (1.09%) is 10% lower than observed monthly FoINCon (0.87%-1.58%). Simulated annual N leaching (0.26 gNm(-2)) is about 10% lower than leaching observation (0.29 gNm(-2)). PnET-CN model validation indicates that PnET-CN is capable to simulate daily GPP, annual NPP, annual NEP, monthly R(s), annual FoINCon and annual nitrate N leaching for subtropical coniferous plantations in southern China. The results obtained from the validation test revealed that PnET-CN model can be used to simulate carbon sequestration of planted coniferous forests in southern China to a high level of precision. Sensitivity analysis suggests that great care should be taken in developing generalizations as to how forests will respond to a changing climate. PnET-CN performed satisfactorily in comparison to other models that have already been calibrated and validated in coniferous planted subtropical forests in China. Based on PnET-CN validation and its comparison to other models, future improvement of PnET-CN should focus on seasonal foliar N dynamics and the effects of water stress on autotrophic respirations in subtropical coniferous plantations in southern China.
出处	Journal of Geographical Sciences
卷	21
期	3
页	458-474
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22619]
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	Yan Y. A.,Wang S. Q.,Wang Y. D.,et al. Assessing productivity and carbon sequestration capacity of subtropical coniferous plantations using the process model PnET-CN. 2011.

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