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应用生态学报 ›› 1993, Vol. 4 ›› Issue (1): 27-31.

• 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Ⅱ.落叶前后养分在植株体内外的迁移和循环

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:1993-01-25 发布日期:1993-01-25
  • 基金资助:

    国家自然科学基金资助项目

Internal and external nutrient cyclings of poplar tree Ⅱ. Transferring and cycling of nutrients in and out of the 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:1993-01-25 Published:1993-01-25

摘要: 杨树落叶时N、P的迁移主要发生在叶和干枝根之间,落叶时叶中2/3的N和1/2的P可迁移至干枝根的皮层和木材之中.皮层和木材中的K在落叶时可能部分向体外排出,叶中的K贮量则几乎保持不变.落叶前后杨树体内N的总循环率可高达62—67%,且以内循环为主;P的总循环率为31—36%,内外循环各占一半,K、Ca、Mg、Si的总循环率均为50%左右,几乎全部为外循环.

关键词: 杨树, 养分循环, 淮河流域, 影响因子, 实际蒸散, 遥感-过程耦合模型

Abstract: About two third of Nand half of Pin leaves are transferred to trunk, branch and root, but part of Kin bark and wood seems to be excreted into soil during leaf falling season. Owing to the uptake of Ca and Mg being continued and the Si in bark and wood being partly transferred to leaves is much high than that in living leaves. The gross cycling rate of Nduring the season is calculated as 62—67%, mainly from internal cycle. The corresponding figure for Pis 31—36%, with half from internal and another half from external cycle. The gross cycling rate of K, Ca,Mg and Si is about 50% respectively, almost from external cycle.

Key words: Poplar, Nutrient cycling, influencing factor., evapotranspiration, Huaihe Basin, Boreal Ecosystem Productivity Simulator (BEPS)