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	Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies
	Pan Y.
	2005
关键词	Tibetan plateau vegetation transect root biomass climate model forest ecosystems tropical forests carbon cycles productivity plateau grasslands allocation vegetation nitrogen climate
英文摘要	Much uncertainty in estimating root biomass density (RBD, root mass per unit area) of all roots regionally exists because of methodological difficulties and little knowledge about the effects of biotic and abiotic factors on the magnitude and distribution pattern of RBD. In this study, we collected field data of RBD from 22 sites along the Tibetan Alpine Vegetation Transects executed with the same sampling method that covered a relatively undisturbed vegetation gradient from subtropical forests to alpine vegetation. Our field data indicated that RBD significantly decreased with increasing altitudes (r(2) = 0.60, P < 0.001) but had low or non-robust correlations with above.-round biomass density (r(2) = 0.10-0.34), suggesting that RBD can be predicted without reference to shoot biomass. The transect data further revealed that temperature and/or precipitation were likely the major limiting factors for geographical distribution patterns of RBD. The relationships could be expressed as logistic function with a maximum RBD of 200 Mg/ha (12 = 0.59-0.65, P < 0.001). A simple empirical model was developed from the logistic regressions and then globally tested against data for 295 field plots of undisturbed to semi-disturbed vegetarion ranging from the boreal zone to the tropics. In general, the model explained 80% of the RBD variation for 30 field plots along the North-South Transect of Eastern China (r(2) = 0.80, P < 0.0001) and less than half of the variation in the global data-set (r(2) = 0.45: P < 0.0001). The model predictions were strong for temperate evergreen forests, temperate/alpine shrubs and grasslands, boreal tundra, and Mediterranean deserts. Such a global scaling exercise revealed the global distribution pattern of RBD broadly over a range of major biomes, suggesting the possibility to develop a new method for large-scale estimation of root biomass. (C) 2004 Elsevier B.V. All rights reserved.
出处	Forest Ecology and Management
卷	206
期	1-3
页	349-363
收录类别	SCI
语种	英语
ISSN号	0378-1127
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23327]
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	Pan Y.. Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies. 2005.

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