妃子笑荔枝树体镁素分布及累积特点  

Distribution and Accumulation of Mg in Litchee Trees cv.Feizixiao

作　　者：陈锦瑞[1] 陈菁[2] 

机构地区：[1]广东省农业科学院果树研究所,广东广州510640 [2]中国热带农业科学院南亚热带作物研究所/海南省热带作物营养重点实验室,广东湛江524091

出　　处：《热带农业科学》2012年第12期1-4,共4页Chinese Journal of Tropical Agriculture

基　　金：农业部948重大国际合作项目(No.2003-Z53);中央级公益性科研院所基本科研业务专项资助项目(No.sscri200707)

摘　　要：采用个体直接收获法,在采果后把10龄和3龄妃子笑荔枝树的根、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镁浓度,并计算其累积量,以探明妃子笑荔枝树体内镁素在各个部位、组织中分布及累积特点,为荔枝镁营养研究及镁肥施用提供依据,结果如下:(1)镁浓度在不同组织和不同部位是不同的,在叶、皮部含量较高,在根颈、主根、茎枝木部含量较低;随着荔枝根系粗度增加,其镁浓度呈下降趋势;在同级枝干中,皮部镁含量显著高于木部;(2)10龄树老叶柄镁浓度显著高于3龄树,但其梢皮部和木部镁浓度则显著低于3龄树;(3)荔枝镁素累积在叶最多,其次为茎,根系镁累积量最少,叶镁素累积量占整株树镁素累积量50%以上(其中10龄树为50.7%,3龄树为62.0%)。10龄树镁累积量(62.0 g)是3龄树镁累积量(9.8 g)的6.3倍。Ten and three-year-old litchi cv. Feizixiao （Litchi chinensis Sonn.） trees were uprooted and divided into 16~20 parts and tissues belonging to 3 organs （root, stem, leaf） after harvest with individuals harvesting method and determine their biomass and Mg concentration for observation of their Mg partition and accumulation. The results were as follows： 1. Mg concentration in different parts and tissues was different. The Mg concentration was the highest in leaves and cortex, and was the lowest in the root crown, taproot, xylm of stem and branches. The Mg concentration of root decreased along with it＇s diameter increasing; In the same order branches and stem, Mg concentration in cortex was higher than that in wood; 2. Mg concentration in old stalk of ten-year-old litchi tree was higher than that of three-year-old litchi tree, but contrary to shoots＇ cortex and wood; 3. Mg accumulation was the most in the leaves. Next was the stem and the less in the root. Mg accumulation in the shoots occupied more than 50% of the total Mg in the tree （in which that in ten-year-old tree and three-year-old tree respectively occupied 50.7%, 62.0%.）. The Mg accumulation in ten-year-old tree （62.0 g） was 6.3 times that in three-year-old tree （9.8 g）.

关 键 词：妃子笑荔枝 镁素 分布 累积 

分 类 号：S667.1[农业科学—果树学]