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应用生态学报 ›› 1992, Vol. 3 ›› Issue (4): 296-301.

• 研究论文 • 上一篇    下一篇

杨树主要营养元素内循环及外循环研究Ⅰ.落叶前后各部位养分浓度及养分贮量变化

沈善敏, 宇万太, 张璐, 廉鸿志   

  1. 中国科学院沈阳应用生态研究所, 沈阳 110015
  • 收稿日期:1992-01-23 修回日期:1992-04-09 出版日期:1992-10-25 发布日期:1992-10-25
  • 基金资助:

    国家自然科学基金

Internal and external nutrient cyclings ot poplar tree Ⅰ. Changes of nutrient storage in different parts of poplar tree before and after leaf fallen

Shen Shanmin, Yu Wantai, Zhang Lu, Lian Hongzhi   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1992-01-23 Revised:1992-04-09 Online:1992-10-25 Published:1992-10-25

摘要: 深秋落叶前后杨树各部位养分贮量发生巨大变化。叶是生长中杨树的重要养分库,叶中N的贮量可占全树N总贮量的2/3,P、K分别可占1/3。落叶时叶中N贮量的60%和P贮量的50%向外输出,因此落叶中只含少量的N和P,但K含量几乎不变,Ca,Mg、Si含量明显增加。树干、枝和根是N、P和有机养分的冬季贮存库,冬季这些部位的N、P贮量比夏季高得多,但K、Si的贮量略有减少,Ca贮量几乎不变,Mg贮量略有增加。

关键词: 杨树, 养分含量变化

Abstract: There are big changes of nutrient storage in different parts of poplar tree before and after leaf fallen in west Liaoning. Foliage is the major nutrient pool for the growing poplar tree. Its Nstorage is about two third of Nin total and Pand Kare more than one third. 60% of Nand 50% of Pin foliage are transferred to other parts of the tree during leaf fallen, with Kcontent almost unchanged and Ca,Mg and Si contents significantly increased.The trunk, branch and root are the reservoirs for N,Pand organic nutrients in winter,their storage of Nand Pis much higher than in sumer,but that of Kand Si is slightly decreased.Ca is almost unchanged and Mg is slightly increased.

Key words: Poplar tree, Nutrient content change