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	Sensitivity of four ecological models to adjustments in fine root turnover rate
	Mccormack M. L.; Crisfield, E.; Raczka, B.; Schnekenburger, F.; Eissenstat, D. M.; Smithwick, E. A. H.
	2015
关键词	Root production Carbon cycle Ecosystem Model sensitivity Carbon allocation Belowground processes soil organic-matter global vegetation model loblolly-pine forest elevated co2 pacific-northwest carbon allocation climate-change united-states life-span land-use
英文摘要	Large uncertainties surrounding root-specific parameters limit model descriptions of belowground processes and ultimately hinder understanding of belowground carbon (C) dynamics and terrestrial biogeochemistry. Despite this recognized shortcoming, it is unclear which processes warrant attention in model development, given the computational cost of additional model complexity. Here, we tested the sensitivity of four models to adjustments in fine root turnover in forested systems: CENTURY, ED2, MC1, and LANDCARB. In general, faster root turnover rates resulted in lower total system carbon (C) and within model changes ranged from 1% to 38% following 100-year simulations. However, the underlying mechanisms driving these changes differed among models as some expressed lower net primary productivity (NPP) with faster turnover rates and others had similar NPP but large shifts in C allocation away from wood to fine roots. Based on these findings we expect that different model responses to changes in fine root turnover will be determined by (1) whether C is allocated to fine roots as fixed portion of NPP or to maintain a fixed biomass ratio between fine roots and leaves or stems and (2) whether soil nutrient and water uptake is a function of both resource availability and fine root biomass or based on resource availability alone. These results suggest that better constrained estimates of fine root turnover will represent a valuable improvement in many terrestrial biosphere models. (C) 2014 Elsevier B.V. All rights reserved.
出处	Ecological Modelling
卷	297
页	107-117
收录类别	SCI
语种	英语
ISSN号	0304-3800
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38782]
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	Mccormack M. L.,Crisfield, E.,Raczka, B.,et al. Sensitivity of four ecological models to adjustments in fine root turnover rate. 2015.

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