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2012年和2013年春天北京市曙光花园小区周边行道树法桐发生了大量死亡现象。为了查明法桐死亡原因,开展了调查研究。调查结果显示:2012年春季曙光花园周边人行道栽植的法桐树的死亡率达24.67%,而绿化带和小区的死亡率为2%和2.5%;2013年春天曙光花园周边人行道法桐的死亡率达13.3%,而绿化带和小区的死亡率均为0。法桐根际土壤分析表明:行道树法桐根际土壤容重和pH值与绿化带和小区没有显著差异,而根际土壤电导率显著高于绿化带及小区。因此,盐离子伤害可能是行道树法桐死亡的主要原因。
In the spring of 2012 and the spring of 2013, a large number of deaths occurred in the tree-fringed Phytophthora in the peripheral road of Shuguang Garden District, Beijing. In order to identify the cause of death Fatong, conducted a survey. According to the survey results, the mortality rate of Fatong Trees planted on the sidewalks around Shuguang Garden in spring of 2012 was 24.67%, while the death rates of green belt and community were 2% and 2.5% respectively. In the spring of 2013, the mortality of Fatong in the sidewalk around Shuguang Garden Up to 13.3%, while the green belt and community mortality rate are zero. The analysis of Rhizosphere Soil showed that rhizosphere soil bulk density and pH had no significant difference with green belt and community, but rhizosphere soil conductivity was significantly higher than that of green belt and community. Therefore, salt ion damage may be the main reason for the death of patricia tree.