Resource Status Analysis of Ancient Trees in Qinzhou District of Tianshui City
In this study,the ancient trees in Qinzhou district of Tianshui city were investigated by using APP of the collection technology based on mobile GIS.The results were as follows:There were 479 ancient trees in Qinzhou district of Tianshui city,belonging to 24 families,31 genera and 42 species.In terms of number,Cupressaceae is a dominant family which contains 220 individuals,and the following dominant families are Leguminosae and Rosaceae,which contain 137 and 51 ancient trees,respectively.The number of the three dominant families account for 46％,29％and 11％of the total number of ancient trees in this region,respectively.For the structure of these ancient trees,the height,the crown width,and the diameter at breast height(DBH),was mainly in the range of 6～27 m,5.5～31.0 m and 81～650 cm,respectively.In terms of ages,there were 186 first-grade ancient trees,accounting for 39％,90 second-grade ancient trees,accounting for 19％,and 203 third-grade ancient trees,accounting for 42％.In study area,there were 51 normal old trees,336 weak old trees and 92 endangered old trees,accounting for 11％,70％and 19％,respectively,and no dead old trees.There were 187 trees occurring in good habitat,163 trees occurring in medium habitat,and 129 trees growing in poor habitatwhich account for 39％,34％and 27％of total number of trees in study area,respectively.Therefore,it will be an important task for us to improve the growing habitat of these ancient trees in the future.
Qinzhou district of Tianshui cityancient treesgrowth statusresource distribution
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NSTL
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