运用树木活力度进行城市生态环境质量分区--以吉林市为例

城市生态环境质量是影响城市景观和居民身心健康的重要因素，环境质量分区是进行生态环境评价的基础性工作。在以往生态环境质量评价中，通常采用单一的环境污染指标，难以全面综合的反应生态环境质量状况。植被的面貌是一定时期内大气、土壤、水分、人类活动综合作用的结果。由于树木有生命而又不能移动，它的健康状态是一定时期因素内，综合地反映其生活环境条件的最好尺度。借鉴国外环境诊断的研究方法，提出“树木活力度”，即树木的枝、叶、梢、树形等各个部位的生长状况和健康程度这一新的综合生态指标，并结合实际，以吉林市为例，对运用这一指标进行城市生态环境质量评价的方法、原理、问题等进行了初步探讨。指出运用树木活力度进行城市生态环境质量分区，具有迅速目测、计算简便，快速经济的特点，是当前较为流行的一种景观诊断的简便易行的方法。

DISCUSSION ON TREE VIGOROUS DEGREE AND ITS APPLICATION IN URBAN ECOLOGICAL ENVIRONMENT REGIONALIZING--A Case Study of Jilin City

Quality of urban ecological-environment is one of the key factors that influence the urban landscape as well as the inhabitants' mental and physical health. Urban ecological environmental regionalizing is the fundamental work for evaluating environmental planning. Single index, which is usually applied in traditional ecological environment quality assessment, cannot reflect the comprehensive urban ecological environment. Features of vegetation result from the interaction among atmosphere, soil, water and human activities in a certain period. The health situation of trees is a best ruler to measure their living conditions. Refered to the environment diagnosis research method, a new index i.e. tree vigorous degree, which means the living condition and the health of the branches and leaves is put forward and its application to urban ecological environment quality assessment is discussed. First, the representative trees are selected. Than, the trees vigorous degree ranks are calculated. Finally, this method is practiced in ecological environment regionalizing in Jilin City. The result shows good agreement with that of the traditional method applied in urban ecological environment regionalizing. Urban ecological environment regionalizing according to trees vigorous degree is a good method, which has advantages of saving time, labor and money. At the same time, it needs further research in the choice of the representative trees, the determinant criterion and the quantification of trees vigorous degree.