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Study On The Population Biology Of Taxus Yunnanensis

Posted on:2007-04-08Degree:DoctorType:Dissertation
Country:ChinaCandidate:J R SuFull Text:PDF
GTID:1100360185476220Subject:Ecology
Abstract/Summary:PDF Full Text Request
Taxus yunnanensis with antiquated origin was list in China Red-book as a species of first-class protected plant and it was also identified as one of protected plants by both CSG and CITES . Although it has the characteristics of narrow distribution and sparse population, it is richest resource and higher taxol content among Taxus spp. So it is important to study population biology of Taxus yunnanensis for the conservation and reasonable use of this species. The distribution, individual amount in populations, genetic diversity and variation of taxol content of T. yunnanensis were studied in this paper in order to provide scientific basis of protection of Taxus yunnanensis,. The studies showed:1) T. yunnanensis distributed in more than 40 counties located in the west, the southwest, the northwest and the middle of Yunnan province, the west of Sichuan province and the southeast of Tibet autonomous Region. It grows in the altitude ranged from 1400m to 4300m with optimal altitude between 2600~3300m. The annual average temperature in the distributed area was varied from 6.756℃ to 11.881℃ with optimal and mean temperature was 7.834~11.244℃, and 9.539℃ respectively. The warm index varied from 39.989 to 82.872℃ per month with mean value 61.287℃; the cold index varied from -19.123 to 0℃ per month with mean value -7.021 ℃; the annual average relative humidity varied from 57% to 80% with mean value 70.594%. The solar duration was from 1322.9h to 2622.1h with mean value 2186.375h. Low temperature, humidity, high temperature and sunlight were the most important factors that affect the distribution of T. yunnanensis. The distribution was divined into 5 parts: the middle, the north, the west, the south in...
Keywords/Search Tags:Taxus yunnanensis, Distribution, Climate, Structure of populations, Genetic diversity, Content of taxol
PDF Full Text Request
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