气候变化领域集成服务门户(CCPortal): Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies

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DOI	10.1016/j.foreco.2004.11.016
	Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies
	Luo, TX; Brown, S; Pan, Y; Shi, P; Ouyang, H; Yu, ZL; Zhu, HZ
发表日期	2005
ISSN	0378-1127
起始页码	349
结束页码	363
卷号	206 期号:1-3
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.
关键词	FOREST ECOSYSTEMS TROPICAL FORESTS CARBON CYCLES PRODUCTIVITY PLATEAU GRASSLANDS ALLOCATION VEGETATION NITROGEN CLIMATE
英文关键词	Tibetan plateau; vegetation; transect; root biomass; climate; model
语种	英语
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:000226569200026
来源期刊	FOREST ECOLOGY AND MANAGEMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257388
推荐引用方式 GB/T 7714	Luo, TX,Brown, S,Pan, Y,et al. Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies[J]. 中国科学院青藏高原研究所,2005,206(1-3).
APA	Luo, TX.,Brown, S.,Pan, Y.,Shi, P.,Ouyang, H.,...&Zhu, HZ.(2005).Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies.FOREST ECOLOGY AND MANAGEMENT,206(1-3).
MLA	Luo, TX,et al."Root biomass along subtropical to alpine gradients: global implication from Tibetan transect studies".FOREST ECOLOGY AND MANAGEMENT 206.1-3(2005).