兰州地区土壤中的铁含量在年周期中的变化及与苹果铁素营养的关系

本文研究了兰州地区土壤中铁含量在年周期中的变化规律,及其与苹果铁营养的关系。实验结果表明:0～60cm土壤中全铁及有效铁含量随季节变化而变化,并且不同深度土壤,即0～20cm、20～40cm、40～60cm土壤中全铁和有效铁变化规律不同;土壤有效铁含量与土壤pH值呈负相关;土壤有效铁与植物铁营养密切相关,其中0～20cm土壤有效铁尤为重要。

CHANGE OF IRON CONTENTS IN LANZHOU SOIL IN A YEAR' S CYCLE AND ITS RELATION WITH IRON NUTRITION IN APPLE TREES

In this paper the changes of soil iron in Lanzhou in a year' s cycle and their relation with iron mutrition in apples were studied . The results showed that the content of total iron and efficient iron in the depth of 0-60cm changed with seasons. And the total iron and efficient iron in different depths (0-20cm,20-40cm ,40-60cm)changed differently. There was an inverse ratio between the efficient iron and the pH value in soil. The efficient iron in soil had a close relation with the iron nutrition in apples, and the efficient iron in the depth of 0-20cm was the most important.