Studies on the Main Causal Factors Affect Cinnamomum camphor Yellowing in Urban Condition

CHEN Chao-yan1,2,LIU Hong-jian3,SHU Qing-long1,LIU Xiao-li1,ZHANG Xin1,4(1.Anhui Agricultural University,Hefei 230036,Anhui,China;2.Forestry Department of Kenli County,Dongying City,Shandong Province,Dongying 257000,Shandong,China;3.Forestry Academe of Anhui Province,Hefei 230031,Anhui,China;4.Junior College of Hefei,Anhui Provience,Hefei 230000,Anhui,China)  

The main factors affected Cinnamomum camphor yellowing in urban area were investigated,and some nutrient elements in soil and leaves were determined.The results showed that there were many factors as the causes of camphor-tree yellowing and the key factors were the root covered tightly with the cement;the soil polluted by the building garbage or waste or the sewage;soil PH value too high;the soil texture too clay and harden which caused by human activity,and im-balance of nutrient elements,etc..In soil mineral elements,the severity of yellowing was positively correlated with the contents of the available potassium,boron,copper,zinc;and negatively correlated with that of the organic matter,available ferric,nitrogen,phosphorus,and manganese.In leaves the contents of available nitrogen,zinc,ferric,and manganese increased with the decrease of disease index and that of sulphur,calcium,boron and copper decrease with the increase of disease index.

【Key Words】： Cinnamomum camphora yellowing disease soil fertility urban environment
【Fund】： 安徽省教育厅基金项目(2005KJ166)
【CateGory Index】： S763.7

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