Adding an empirical factor to better represent the rewetting pulse mechanism in a soil biogeochemical model

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Adding an empirical factor to better represent the rewetting pulse mechanism in a soil biogeochemical model
	Li, Xuyong ; Miller, Amy E. ; Meixner, Thomas ; Schimel, Joshua P. ; Melack, John M. ; Sickman, James O.
刊名	GEODERMA
	2010-11-15
卷号	159 期号:3 页码:440-451
关键词	Rewetting pulse Mineralization Carbon and nitrogen cycling Moisture factor DAYCENT
中文摘要	The rewetting of a dry soil causes a pulse in decomposition of soil organic matter (SOM). This mechanism may dominate carbon (C) and nitrogen (N) cycles in arid, semi-arid and Mediterranean ecosystems. Existing biogeochemical models perform poorly for systems characterized by pulsed events. In this study, we added a rewetting factor into the DAYCENT soil biogeochemical model to better represent the drying-rewetting pulses. Based on a 4-month laboratory incubation from a parallel study, we developed a simple rewetting factor for representing the enhanced mineralization pulse by rewetting stimulation. The rewetting factor was then incorporated into DAYCENT by modifying the soil moisture factor. The DAYCENT modification significantly improved model performance in predicting soil C respiration rates in drying-rewetting treatments through the capture of rewetting pulses. The modification also improved prediction performance for net N mineralization in treatments with shorter rewetting intervals, but did not improve predictions in treatments with longer rewetting intervals. The model modifications were validated by using a laboratory incubation data set from a different field site. The modified DAYCENT predictions showed that active and slow SOM pools were major contributors to mineralization pulses while the contribution from the passive pool was minimal. The modifications we made improved model performance and should be considered in future field representations of biogeochemical processes. (C) 2010 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000284347600022
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/20949]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Li, Xuyong,Miller, Amy E.,Meixner, Thomas,et al. Adding an empirical factor to better represent the rewetting pulse mechanism in a soil biogeochemical model[J]. GEODERMA,2010,159(3):440-451.
APA	Li, Xuyong,Miller, Amy E.,Meixner, Thomas,Schimel, Joshua P.,Melack, John M.,&Sickman, James O..(2010).Adding an empirical factor to better represent the rewetting pulse mechanism in a soil biogeochemical model.GEODERMA,159(3),440-451.
MLA	Li, Xuyong,et al."Adding an empirical factor to better represent the rewetting pulse mechanism in a soil biogeochemical model".GEODERMA 159.3(2010):440-451.