【摘要】 对合肥市区樟树黄化病与立地条件关系进行了调查研究,并对不同程度的病株叶片营养成分进行了分析,结果表明:樟树黄化原因复杂多样,主要原因是pH值过高导致土壤中的有效铁不能被根系吸收;其他原因如地表水泥覆盖过度、土壤密度过大、污染严重、土壤营养条件不良等因素构成。在土壤矿质元素中,黄化程度与速效K、B、Cu、Zn的含量呈正相关;与有机质、有效Fe、速效N、速效P、Mn等元素含量呈负相关。在樟树叶片营养元素中,速效N、Zn、Fe和Mn含量随着黄化程度的增加而下降;S、Ca、B和Cu的含量随着病害的加重而增加。更多还原

【Abstract】 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.更多还原