Studying about human influence of plant diversity at Tan Trao historical relic, Tuyen Quang province

Abstract

Studying results at Tan Trao historical relic, Tuyen Quang province showed that excessive exploitation of forest resources here reduced strongly the diversity for plant species in forest. Group of medicinal plants has 470 species, in which 10 species are exploited with a high frequency including Morinda officinalis, Stephania dielsiana, Multiflora Fallopia, Ardisia silvestris, Drynaria fortunei.…; The group of edible plants has 142 species that are also regularly collected and eradicated such as Melientha suavis, Diplazium esculentum, Canarium tramdenum, Canarium album, bamboo shoots such as Bambusa nutans, Neohouzeaua, Ampelocalamus; The group of ornamental plants have 99 species including Barringtonia acutangula, Banyan, Ficus benjamina and Chimonobambusa quadrangularis…; The group of plants extracted for oil which has 69 species, accounting for 9,5% of total number of species surveyed in the studying area. Some common species are Desmos pedunculosus, Xanthiuminae quilaterum, Litsea cubeba, Sapindus saponaria, etc. Due to long-term impact caused by human on species, the stratified structure of natural forest, there are many different types of vegetation in the relic which differ significantly between protected natural forests and exhaustedly-exploited regenerated forests.