| Taxus chinensis is a nature resource of anticancer medicine, a good species for landscape planting what has important economic, social and scientific research value. But the origin of Taxus chinensis is very ancient. As one of the first-class protective plants in China, an endangered species with small number, Taxus chinensis is an ancient relict species of Quaternary Glaciation. Taxus chinensis have been determined as a protected species by CSG and the Convention on International Trade in Endangered Species of Wild Fauna and Flora, the protection and utilization of it receives much concern in the world. Whether from species protection and resource development, or from the systematic status, study of Taxus chinensis has the extremely vital significance.Taking Taxus chinensis plantation in the experiment base of Sichuan Ruiyun ecological agriculture technology development corporation in Qionglai Sichuan province as research object, the dynamic growth, biomass accumulation, ecological benefits and health benefits were studied, in order to provide basic data and theoretical basis of rational exploitation and utilization of the Taxus chinensis. Through the research, concluded that:1 The dynamic growth of Taxus chinensis The early growth and development stage of Taxus chinensis was from January to April, the vigorous growth period was from April to October, and the late growth stage was from October to December. The average increment of tree height> the average increment of new shoots length> the average increment of ground diameter. The trends, both of the growth dynamic changes in different period and biomass accumulation dynamic changes of the Taxus chinensis, were basically the same.There was a certain correlation between the tree height, ground diameter and biomass accumulation of Taxus chinensis. Building regression equation about Taxus chinensis biomass, regarded ground diameter (D), tree height (H) and square of ground diameter multiplied by tree height (D2H) as independent variable, and the F-test value of it was greater than F0.01 which showed extremely significant. From the coefficient of determination of regression equation in different independent variable, the coefficient of determination was the highest R2=0.9976 when regarded H as independent variable, so we could use Has independent variable to simulate the biomass of Taxus chinensis.2 The ecological benefits of Taxus chinensisThe order about daily carbon amounts assimilated per unit leaf area of Taxus chinensis in different seasons was that:4.89 g/d·m2 in summer>3.81g/d·m2 in autumn>2.55g/d·m2 in spring>1.98 g/d·m2 in winter. The order about daily releasing oxygen quantity per unit leaf area of Taxus chinensis in different seasons was that:3.56 g/d·m2 in summer>3.81g/d·m2 in autumn>1.85 g/d·m2 in spring >1.44 g/d·m2 in winter.The order about daily Transpiration absorbing heat quantity per unit leaf area of Taxus chinensis in different seasons was that:1898.73kj/d·m2 in summer>1556.53kj/d·m2 in autumn>1330.02 kj/ d·m2in spring>729.34 kj/d·m2 in winter. The order about cooling effect per unit leaf area of Taxus chinensis in different seasons was that:0.125℃in summer>0.102℃in autumn>0.088℃in spring >0.018℃in winter.The order about the amount of dust absorption of Taxus chinensis in different period was that: 0.415 g/kg (November in 2009)> 0.386 g/kg (March in 2009)> 0.339 g/kg (July in 2009).The yearly amount of dust absorption per unit leaf weight was 0.380 g/kg and the amount of dust absorption per unit leaf weight was 6.384 g/kg.3 The health benefits of Taxus chinensisThe order about the amount of Taxus chinensis absorbing sulphur in different period was that: 0.36%(November in 2009)>0.31% (March in 2009)>0.28%(July in 2009), the annual mean of absorbing sulphur was 0.32%, and the variation trend of it was the same with the amount of dust absorption.Thirty-five species composition were found in the volatile organic compounds from the Taxus chinensis, and the main components were alcohols, occupying 74.315% in total content, the second was terpene, occupying 10.996% in total content, and 5 species composition were included. Esters account for 5.05% of the total volatile organic compounds. The contents of aldehydes and ketones were similarly, accounting for 3.77% and 3.394%. In addition, a small quantity of octane was found, and the content of it was 0.612%. The two least species were butylated hydroxytoluene and tolane accounting for 0.386% and 0.143%. Moreover, two kinds of unknown compounds were also detected. Alcohols, 2-hexenal, benzaldehyde,4-ethyl benzaldehyde and a-pinene were all the beneficial ingredients to human in the volatile organic compounds.
|
PDF Full Text Request