摘要
采用整株枝解法,在采果后把9a生成年妃子笑和黑叶、3a生幼年妃子笑荔枝的根、木质部、皮部、叶、复叶柄5个器官分成14～16个部位,测定各个部位各个器官的N含量。结果表明,1)N在不同器官和不同部位含量是不同的。N含量在叶片最高,在根颈、主茎木质部、主根含量较低;在同级枝根中,皮部N含量显著高于木质部;荔枝枝干和根系,随着其粗度增加,其N含量基本上呈下降趋势,但成年树下降幅度比幼年树的大。2)成龄妃子笑与黑叶各部位各器官N含量没有显著差异,但成年树叶、复叶柄、末级侧枝皮部、木质部N含量高于幼年树相应部位相应器官N含量。3)荔枝N素累积在叶片最多,其次为枝干,根系N累积量较少,末级侧枝N素累积量占整株树N素累积量50%以上。
Nine and three-year-old trees of Feizixiao （Litchi chinensis Sonn cv. Feizixiao） and 9-year-old tree of Heiye litchi cultivars were uprooted and divided into 14 to 15 parts belonging to 5 organs （root, xylem, cortex, leaf, leaf stalk） after harvest. The N concentration in different parts and organs was examined. The results showed that there was significant difference in the N concentration in different parts and organs. The N concentration in leaves was the highest, and the lowest was in the root crown, stem xylem and taproot. The N concentration of cortex was higher than that of xylem in the same shoots and roots and N concentration of shoots and roots decreased with the diameter increasing. But the extent of decreasing in the mature trees was more than that in the young trees. There was no significantly different in N concentration in organs in trees except the old stalk between Feizixiao and Heiye. The N concentration in the leaf, stalk and the last order lateral shoots in the mature trees were higher than those of the young trees. The highest N accumulation was in the leaves, then in the shoots and roots. N accumulation in the last order lateral shoots occupied 50% of the total N in the tree.
出处
《果树学报》
CAS
CSCD
北大核心
2009年第2期231-234,共4页
Journal of Fruit Science
基金
中国热带农业科学院南亚热带作物研究所中央级公益性科研院所基本科研业务专项
国家支撑计划(2008BAD4B05、2006BAD10B02)
关键词
荔枝
N素分布
N累积
Litchi
N distribution
N accumulation
