桂花芳香浓郁,清雅不俗,深受我国人民的喜爱。但近十年来,一些城市的桂花树开花逐渐减少,甚至有的树一朵花也不开。为此,我们做了一些调查工作。桂花不开花的原因从上海各公园的桂花树来分析,不开花的原因大致有以下几种情况:烟尘污染近年来有些报道认为桂花叶片对二氧化硫、氟化氢、氯气等污染气体有较强的抗性,因此许多市区的公园就大量种植桂花。但是实际上因桂花原产在环境清静的山区,其生长条件要求洁净的空气。在含有烟尘的空气 Osmanthus fragrant, elegant and impressive, by our people’s favorite. However, in recent ten years, the osmanthus trees in some cities have been gradually reduced in flowering, and even some trees and flowers have not opened. To this end, we did some research. Osmanthus is not flowering reasons from the Shanghai sweet-scented osmanthus trees in various parks to analyze the reasons for not flowering in the following general situation: Soot pollution In recent years, some reports that osmanthus leaves on the sulfur dioxide, hydrogen fluoride, chlorine and other polluted gases have strong resistance , So many urban parks on the large-scale cultivation of sweet-scented osmanthus. But in fact because Osmanthus native in the quiet mountainous areas, its growth conditions require clean air. In the air containing soot