西安城市及郊野绿化树种的调查研究

1979年10—11月,在西安市区和郊区以及临潼骊山、华阴华山等地进行了集体或分组调查。市区调查树木共3,402株,其中针叶乔木298株,占8.8％;,常绿阔叶乔木157株,占4.6％;落叶乔木1,795株,占52.8％;常绿灌木203株,占6.0％;落叶灌木760株,占22.3％;藤木189株,占5.5％。在西安市,共调查园林树木275种(变种、变型在内),均按统一表格详细记载,在市区及郊野共记载百年以上的古树74株,其中最老的是一株2,000年生汉槐。对西安市区及郊野调查结果进行了分析,并提出关于西安市基调树种和各类型绿地骨干树种的建议。

AN INVESTIGATION OF TREES AND SHRUBS IN XI'AN CITY AND ITS SUBURBS

Trees and shrubs cultivated in Xi'an city and its suburbs including several neghbouring famous landscape areas were investigated during Oct.19 to Nov.15,1979 by the authors.A sum of 3,402 plants of trees and shrubs was recorded,including 298 coniferous trees (8.8% of the total plants),157 broad-leaved evergreen trees (4.6%),1,795 deciduous trees(52.8%),203 evergreen shrubs (6.0%),760 deciduous shrubs(22.3%),and 189 woody climbers (5.5%).In Xi'an City,275 species (including var.and f.) were recognized through systematic investigation by means of unified recording items and unified sampling and recording methods and schemes for the trees and shrubs during this period.More than 200 species of wild landscape trees and shrubs were recorded when the authors investigated Li Shan,Hua Shan,Nan Wu Tai and their neighbourhood.As many as 74 old trees and famous trees of historic importance belonging to 34 species were recognized and described.Among these,the oldest was a Sophora japonica tree aged about 2,000 years found and recorded in the suburb of Lin Tong.Some problems in selecting and utilizing trees and shrubs for landscape architecture of Xi'an City are discussed in the paper.Furthermore,4 "basic-tone tree species"(Sophora japonica,Platanus acerifolia,Sabina chinensis,and Ginkgo biloba) for the whole city as well as 10-30 "framework tree species" for each type of the open spaces are suggested.