摘要
植物营养诊断是评估大花序桉营养状况的可靠、便捷方法。本研究采用诊断施肥法(DRIS),对广西崇左发生“黄化症”的大花序桉苗木营养状况进行调查、诊断。结果表明,大花序桉苗期叶片营养元素含量与“黄化症”之间密切相关。大花序桉叶片苗期养分供给状况以及需肥顺序为Fe>P>N>Mg>K>B>Cu>Zn>Mn>Ca。黄化症的叶片N、P、Fe和Ca诊断指数均小于0,属于缺乏水平,是影响苗木黄化的关键因子,而其他营养元素的DRIS诊断指数均为正值,供给较为充足。大花序桉苗期的各营养元素的适宜范围为N(7.50~10.80)g/kg、P(1.25~2.98)g/kg、K(10.37~30.64)g/kg、Ca(5.13~23.631)mg/kg、Mg(1.55~3.82)mg/kg、Cu(4.53~8.34)mg/kg、Zn(46.57~62.83)mg/kg、Fe(140.03~226.31)mg/kg、Mn(252.95~426.99)mg/kg、B(18.80~39.85)mg/kg。
Plant nutrition diagnosis is a reliable and convenient method for evaluating the nutritional status of Eucalyptus cloeziana.This study used diagnosis and recommendation integrated system(DRIS)to investigate and diagnose the nutritional status of Eucalyptus grandiflorus seedlings subjected to“chlorosis”in Chongzuo,Guangxi.The results indicated that there was a close correlation between the nutrient content of Eucalyptus cloezianas leaves at the seedling stage and“chlorosis”.The nutrient supply status of Eucalyptus cloeziana leaves at seedling stage as well as the order of fertilizer requirement were Fe>P>N>Mg>K>B>Cu>Zn>Mn>Ca.The values of leaf N,P,Fe,and Ca diagnostic indices of etiolated leaves were all less than 0 and belonged to deficiency levels,which were key factors affecting seedling yellowing,whereas the values of DRS diagnostic indices of other nutrients were all positive and in more adequate supply standard.The suitable range of each nutritional element for the seedling stage of Eucalyptus cloeziana was N(7.50-10.80)g/kg,P(1.25-2.98)g/kg,K(10.37-30.64)g/kg,Ca(5.13-23.631)mg/kg,Mg(1.55-3.82)mg/kg,Cu(4.53-8.34)mg/kg,Zn(46.57-62.83)mg/kg,Fe(140.03-226.31)mg/kg,Mn(252.95-426.99)mg/kg,B(18.80-39.85)mg/kg.
作者
覃祚玉
唐健
覃其云
石媛媛
邓小军
潘波
QIN Zuoyu;TANG Jian;QIN Qiyun;SHI Yuanyuan;DENG Xiaojun;PAN Bo(Guangxi Forestry Research Institute,Nanning 530002,China;Key Laboratory of Central South Fast-growing Timber Cultivation of National Forestry and Grassland Administration,Nanning 530002,China;Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning 530002,China)
出处
《林业调查规划》
2023年第6期125-131,共7页
Forest Inventory and Planning
基金
广西自然科学基金项目(2022GXNSFBA035630)
中央引导地方科技发展资金项目(桂科ZY21195026)。
