荔枝树体钾素分布及累积特点

采用个体直接收获法,采果后把9年生荔枝品种妃子笑和黑叶、3年生妃子笑的根、茎、叶3个器官分成16~20个部位和组织,分别测定各个部位各个组织的生物量和钾(K)含量,并计算K累积量,以探明荔枝树体内K素分布及累积特点,为K肥施用提供依据,结果表明,K在不同器官不同部位含量是不同的,K含量在新成熟复叶柄最高,其次为老叶复叶柄、末级侧枝韧皮部,在根颈、主茎木质部、主根含量较低;荔枝枝干和根系K含量基本上是随着其粗度增加,呈下降趋势,但成年树下降幅度比幼年树的大.成年妃子笑荔枝K素累积量在叶片和枝干较多,根系K累积较少.妃子笑成年末级侧枝K素累积量占整株树K素累积量的58.7%.

Distribution and Accumulation of K in Litchi chinesis Tree

The 16-20 parts of root,stem and leaf in nine-year-old Litchi chinesis Feizixiao and Heiye and three-year-old Litchi Feizixiao after harvest were collected to analyze their K concentration of different parts and organs.The results showed that the K concentration of different parts and organs was significantly different,the K concentration in the new mature leaf stalk was high,the K concentration in old leaf stalk and cortex of the last lateral branch was moderate and the K concentration in the root collar,the xylm of main stem and the main root was low.The K concentration of shoots and roots decreased with the diameter increase,however the decreased extent in the mature trees was more than the young tree.The K accumulation in shoots and leaves of the Feizixiao tree was more than that in its roots,and the K accumulation in the last lateral branch of mature Feizixiao tree occupied 58.7% of the total K in tree.