摘要
通过对酥梨正常树、轻度黄化树、重度黄化树的根际土和根丛土中 N、P、K、Fe、Mn、Cu、Zn、HCO3-及 p H的研究表明 :缺铁黄化使梨树根际 N、P、K、Mn、Cu明显富集 ,Fe在轻度黄化时亏缺 ,重度黄化时富集 ,Zn随黄化加重而亏缺值增大。根际土壤的 p H有下降趋势 ,缺铁黄化使这种趋势更加明显。HCO3-在根际和根丛土中含量均随缺铁黄化程度加重而增加。在高 p H和低有效 Fe的条件下 ,高 HCO3-是引起梨树缺铁黄化的主要因素 ,降低土壤中 HCO3-
By means of analyzing nutrient elements, HCO 3 -and pH value of root zone and rhizosphere soil, according to the degree of chlorotic trees, the results showed that N?P?K?Cu?and Mn content of rhizosphere soil accumulated. Fe content was depletion in slight chlorotic trees and accumulaton in severe chlorotic trees. Zn content of rhizosphere decreased with the degree of chlorotic rate increasing. The more the chlorotic rate increased, the more the rhizosphere pH value decreased. HCO 3 -content increased with the degree of chlorotic rate increasing in rhizosphere and root zone soil. The high HCO 3 - content is main and immediate reason of iron chlorosis under high pH value and low effective Fe soil. Reducing the content of HCO 3 - is a primary method to correct the iron chlorosis.
出处
《西北农业学报》
CAS
CSCD
2001年第4期95-98,共4页
Acta Agriculturae Boreali-occidentalis Sinica
基金
陕西省九五攻关项目 (98K0 5 -G2 -0 2 )部分内容
