广西孟江油茶叶片营养DRIS诊断

Study on Leaf Nutrient of Camellia oleifera in Guangxi by DRIS

以广西三江侗族自治县40年生孟江油茶(Camellia leifera Abel)成林叶片为对象,对该油茶产区高产组和低产组油茶叶片的9种养分(N、P、K、Ca、Mg、Cu、Zn、Fe、Mn)进行DRIS诊断。结果表明:油茶林N、P、Fe相对缺乏,K、Ca、Mg、Cu、Zn、Mn相对充足,其中养分P、Fe元素在高、低组间差异显著,N、P和Fe元素缺乏是提高油茶产量的最大限制因子;树体需肥顺序为:N>P>Fe>Zn>Cu>Ca>Mn>K>M;同时,利用高产组叶片养分浓度、养分诊断指数及其等级制定了相应的养分诊断标准,可为三江侗族自治县指导油茶施肥管理提供参考。

DRIS diagnosis was used to diagnose the leaf nutrient status of Camellia oleifera Abel of 40 years old in Sanjiang Dong Au-tonomous County,based on analyzing nine nutrient elements （N,P,K,Ca,Mg,Cu,Zn,Fe,Mn）in leaves of Camellia oleifera Abel plantations.Diagnosis results showed that N、P and Fe were lacking ,K,Ca,Mg,Cu,Zn,Mn and Mn were correspondingly sufficient , and supplies of P,Fe nutrients varied greatly between high and low Production group.Accordingly,the inadequacy of the trace ele-ment N、P and Fe was the biggest restriction in the improvement of the production of Camellia oleifera Abel,fertilization should be based on N,P,and Fe.What is more,According to the nutrient concentration ,nutrient diagnosis indexes and nutrient grades for the high-production group ,the nutrient diagnosis standards were made and the nutrient status about the Camellia oleifera is controlled , which can provide the scientific base in fertilization managment.