【摘要】 在香榧主产区浙江省嵊州市长乐镇,分别以15年生香榧正常树、黄化树的1年生、2年生枝叶为研究对象,测定枝叶的营养元素含量,探讨枝叶黄化与各营养元素丰缺的相关性。结果表明:黄化枝的叶片N、Mn元素含量均高于正常枝,Ca、Mg元素含量均低于正常枝,随黄化程度加剧,Mn元素含量呈现上升趋势,Ca、Mg元素含量呈现下降趋势;黄化枝的枝条N、P、Mn元素含量水平高于正常枝,Fe元素含量水平低于正常枝,随黄化程度加剧,Mn元素含量呈现上升趋势,Fe元素含量呈现下降趋势。由此推断,香榧枝条黄化与Ca、Mg、Fe元素水平低下及N、Mn元素水平过高有一定关系,生产中可通过适量减少N肥施用量,增加Ca、Mg、Fe等元素的施用,同时结合土壤物理性质改良加以防治。更多还原

【Abstract】 With both one-and two-year-old shoots and leaves collected from a 15-year-old tree that grows normally and another tree with yellowing shoots and leaves at the same age in Torreya grandis ’Merrillii’ located in Changle Town,Shengzhou City of Zhejiang Province,a main producing area of T. grandis ’ Merrillii’,nutritional elements were measured to explore the relationship between yellowing of leaves and shoots and nutritional elements. The results showed that contents of N and Mn in the leaves of yellowing shoots were higher than those of normal shoots,but contents of Ca and Mg were lower. With the development of yellowing,the content of Mn in the leaves presented an increasing tendency while the contents of Ca and Mg presented a declining trend. The contents of N,P,and Mn in the yellowing shoot were higher than those in normal shoots,but the content of Fe was lower. With the development of yellowing,the content of Mn in the shoots presented an increasing tendency while the content of Fe presented a declining trend. Therefore it was inferred that low levels of Ca,Mg,and Fe and high levels of N and Mn were responsible for yellowing shoots.In production,reducing N fertilizer and increasing Ca,Mg and Fe fertilizers in combination with improving the physical property of soil were useful to prevent and control yellowing.更多还原