Harwood relative dating


24-Oct-2016 20:50

Many of the trees [grow] on disturbance-generated microsites, such as stream banks, steep rocky slopes, and the edges of exposed cliffs. [Many] individuals are multitrunked, consisting of at least two trunks greater than 10 cm in diameter at breast height.

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Seeds also on short shoots, maturing in one year, obovoid to ellipsoid, yellow to orange, 2.3-2.7 × 1.9-2.3 cm, mostly 1.1-1.2 times longer than broad, glaucous, rugose, with apical scar, maturing in single season, usually 1 per peduncle, the outer coating softening and giving off a foul odor (which is why female plants are rarely seen). Our results agree with existing genetic studies that show that these mountains were glacial refugia for G. Mean annual temperature is about 14°C with a mean monthly minimum temperature as low as 1.8°C in January and maxima as high as 25.1°C in July. The Ginkgo trees occur in a structurally complex mixed forest that includes many canopy tree species, among them the conifers Cunninghamia lanceolata and Taxus sumatrana. In this role the species is nearly cosmopolitan, planted in temperate and subtropical areas around the globe (Whetstone 1993). Pages 32-37 in: International Dendrology Society Yearbook 1995. The population is all-aged, including many seedlings and saplings as well as mature trees, the latter having DBH values of up to 369 cm (Tang et al. The species is also reported to occur naturally at Dahongshan in Hubei, Tianmushan in Zhejing, Wuchuan in Guizhou, and Jinfoshan near Chongqing, Sichuan, although these localities have not been evaluated using the rigorous methods employed by Tang et al. (2012) and some or all of these populations may be introduced or naturalized. (1992) report on the population in the remote mountain valleys in China's Zhejiang province, where a stand has been preserved as the 1018 ha Tianmushan Reserve.

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This area has supported human activities for approximately 1500 years and it is thus plausible, given the long history of ginkgo as an ornamental species in the area, that its persistence at this site has been facilitated by human actions. Regardless of its origin, the "population is biologically significant by virtue of its long survival in a semi-natural state under conditions of intense interspecific competition.



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