樟树正常叶片与黄化叶片营养状况的周年变化

Studies on Year-cycle Changes of Leaf Nutrient Status from Camphor Tree

对位于浙江杭州钱塘江北岸滨海石灰性土壤地区黄化和正常樟树叶片营养状况年周期变化规律作了研究,结果发现黄化樟树叶片全磷比正常树高,而叶绿素计读数(SPAD值)、活性铁、全铁、全N、全K、过氧化氢酶和过氧化物酶活性比正常树低,4个取样时期樟树黄化从轻到重顺序依次为2007-08、2007-06、2007-03和2006-10,全磷与活性铁之间表现为拮抗作用,其余营养元素与活性铁之间表现为增效作用。据樟树缺铁黄化叶片营养状况年周期变化规律提出施肥建议,为预防和治理樟树黄化提供新的依据。

The year-cycle changes of leaf nutrient status of normal and chlorosis camphor trees grown in calcareous soil were surveyed in coastal regions on the north shore of the Qiantang River of Hangzhou city.The results indicated that leaf total P of chlorosis trees were higher than normal trees,while active Fe,total Fe,total N,total K,SPAD value,peroxidase and catalase activities were lower.Among four sampling times,the order of chlorosis from light to heavy was August in 2007 June in 2007 March in 2007 October in 2006.The results also showed antagonism of leaf total P and active Fe,while the remaining elements and physiological indexes were synergy.On this basis a new fertilizing method of camphor was recommended to provide for treating and preventing of chlorosis camphor.