城市绿化中樟树叶片黄化的营养诊断

Nutrition diagnosis of camphora tree leaves in municipal landscaping

樟树(Cinnamomum camphora)作为城市绿化树种常会发生叶片黄化现象,既引起树木生长不良,也影响景观的美观度。本试验以张家港市主要街道两旁发生叶片黄化的樟树为研究对象,以叶片颜色正常的樟树为对照,通过采集叶片进行养分含量、SPAD值和酶活性等测定,诊断黄化叶片的营养特征。结果表明:黄化樟树叶片全磷含量比正常樟树的高,而全氮含量、全钾含量、SPAD值、活性铁含量、全铁含量、过氧化氢酶和过氧化物酶含量比正常樟树的低;活性铁与全磷含量之间表现为拮抗作用,活性铁与全氮含量、全钾含量、SPAD值、全铁含量、过氧化氢酶和过氧化物酶含量表现为增效作用。

Chlorosis often occurs in camphor trees(Cinnamomum camphora)which are used for municipal landscaping.Chlorosis not only shows the poor growth of trees,but also affects the beauty of the landscape.Taking chlorosis camphor tree on both sides of main streets of Zhangjiagang City as an object,and normal camphor tree as the control,nutrient content,SPAD value and enzyme activity of leaves were measured to diagnose the nutritional characteristics of camphor chlorosis.The results indicated that total phosphorus content of chlorosis trees were higher than normal trees,while the contents of total nitrogen,total potassium,SPAD value,active iron,total iron,catalase and peroxidase activities were lower.There was antagonism between active iron and total phosphorus,while there was synergy between the active iron and total nitrogen,total potassium,SPAD value,total iron,catalase,peroxidase.