Study On Seed Plant Diversity And Contents Of Styrax Tonkinensis Essential Oil In Yangling

In the paper,flora of seed plants were studied in Yangling National Forest Park.Yangling National Forest Park is located 1 km south of chongyi county,jiangxi province,and located in the south end of the Luoxiao mountain,north slope of Nanling mountain.Here with a total area of about 6889.8 hectares and forest coverage rate of 96.8%,the geographical position of E113°54'~ 116°38',N24°29'~ 27°09'.Investigating the flora of seed plants and collecting more than 1,500 specimens.Analysis the composition,characteristic,property and ancient of species diversity after identification of collected specimens.Statistical analysis of three levels of families,genera and species of Yangling National Forest Park seed plants by flora method.Results are as follows:(1)155 family,592 genus and 1237 species(excluding cultivated plants)seed plants were found in Yangling National Forest Park.These include 7 family,10 genus and 13 species gymnosperm,128 family,512 genus and 1107 species dicotyledon,20 family,70 genus and 117 species monocotyledons.(2)There have diversity characteristics of mid-subtropical to south-subtropical.The diversity of the seed plants is generally dominated by tropical distribution in Yangling National Forest Park.The flora property of Yangling National Forest Park are similar to South-China Flora,such as Gnetum parvifolium,Cinnamomum austrosinense,Camellia parvicuspidata.It is indicates that the flora of Yangling National Forest Park has mid-subtropical to south-subtropical property.(3)There are many ancient contents.The place preserved many ancient families and relict plants,such as gymnospermae Gnetaceae,Taxus,Fokienia,Cunninghamia in triassic.The place preserved ancient families in cretaceous,such as angiospermae.There are descendant of Magnoliaceae,Bretschneideraceae,Calycanthaecae,Chloranthaceae,Moraceae Gaudich.,Hamamelidaceae,Ulmaceae.And then,there are much single type family content in Yangling National Forest Park,such as Erythroxylaceae,Sargentodoxaceae,Eucommiaceae.These fully illustrate the ancient origins of the diversity of seed flora in Yangling National Forest Park.(4)There are a lot of rare plants.Yangling National Forest Park have National level to protect plants 7 family,9 genus and 9 species.There are 2 kinds of first-grade protected plants and 7 kinds of second-grade protected plants among National level to protect plants.There are 23 kinds of provincial protected plants(There are not included National key protected wild plants).2 kinds of provincial second-grade protected plants and 21 kinds of third-grade protected plants among National level to protect plants have been discovered.The rare plants is material basis to build up sustainable development society and processes high research value on scientific research.(5)The relation with the flora of the adjacent area: Yangling National Forest Park is closely linked to Qiyun Mountain flora,Minjiangyuan flora,Wuyishan flora and Jinggangshan flora with most common species.Especially,Yangling flora and Qiun mountain flora are located in the south end of the Luoxiao mountain with similar climate.The flora origin are closely with evolution in Yangling.(6)In this study,analysis ethereal oils composition of Styrax Tonkinensis flower in Yangling National Forest Park.A total of 40 chemical constituents were identified,mainly ketones,alcohols,alkenes,aldehydes,alkanes,phenols,ethers and esters.The content mainly verbenone(7.83%),D-limonene(7.38%),nonanal(6.41%),L-carvone(5.24%),eugenol(2.93%),anethole(3.2%)and ?-ionone(2.78%).