The distribution and some ecological characteristics, and essential oil of Cunninghamia konishii Hayata in Pu Hoat nature reserve, Nghe An province, Vietnam

Abstract

In Pu Hoat Nature Reserve, Nghe An Province, Vietnam, Cunninghamia konishii Hayata is normally found on a number of mountainous ranges along part of the border between Lao PDR and Vietnam. They are mainly distributes in 4 communes: Tri Le, Hach Dich, Nam Giai and Thong Thu. This species distributes at altitudinal range from 1,180 – 2,320 m a.s.l and on high slope from 35⁰ - 45⁰, grows in scattered form or becomes concentrated to form the nearly pure population, the average density of population is 8.5 trees / ha with an  area of approximately 96.5 ha of natural forest with the reserves totaling 10,448.8 m³. This species is distributed in mixed broadleaf trees - conifer moist evergreen subtropical forest and  predominately found in the emergent layer. Regenerated forms of streaks or voids, canopy regeneration of the poor under the forest. Cunninghamia konishii Hayata grows in Ferralic Acrisols (Xha) and Humic Acrisols (Xfa). Twenty-six components have been identified accounting for more than 97.07% of the root oil yield. The major constituents of this oil are a-cedrol (29.18%), b-eudesmol (24.21%), g-eudesmol (9.34%), thujopsene (6.37%) and a-cedrene (4.28%). b-eudesmol and thujopsene of samples are much more than the samples reported.