摘要
本文用对比和分析方法研究了土壤与泡桐叶中养分含量、相互关系及其在丛枝病发生中的作用。土壤中磷、铜、锌、铁和钾的比值与泡桐叶中相应的比值呈极显著的正相关(r=0.918^(**)),表明土壤养分含量的多寡对泡桐丛枝病的发生起着十分重要的作用。土壤低的磷和高的铜含量以及磷钾、磷铜、磷锌、铜锌、铁铜和铁锰等元素间的拮抗作用,使得泡桐树体内钾和铜的含量过高,磷和锰的含量偏低,树体正常生长所需的磷钾、铜锰、铁锰比遭到破坏,引起代谢紊乱,导致泡桐树的抗病能力下降而患上丛枝病。
: The paper deals with the relationship between contents of available nutrients in soil and nutrients in Paulownia leaves by using comparative analysis. The relation between P/Cu,P/Fe,P/Zn and P/K in soil and that in Paulownia leaves is significant positive correlation (r=0. 918** ). This shows that there is a relationship between incidence of Paulownia witches' broom and contents of available nutrients in soil and of elements in leaf. Low phosphorus and high copper contents in soil and the antagonistic action a-mong elements in soil and in plant are the reasons that the contents of potassium and copper in Paulownia leaf are exorbitant and manganese and phosphorus are deficient. So the proper ratios of P : K,Fe : Mn and Cu : Mn are disrupted by the excessive potassium and copper in the leaf, which ,in turn, inter feres the normal metabolism of Paulownia and reduce its resistance to witches' broom.
出处
《生态农业研究》
CSCD
1994年第1期49-55,共7页
Chinese Journal of Eco-agriculture
关键词
泡桐
土壤
养分含量
扫帚病
Paulownia
Nutrient content and ratio
Witches' broom
Soil
