欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

添加氮肥对沙地樟子松幼苗生物量分配与叶片生理特性的影响

邓斌1,2;曾德慧1   

  1. 1中国科学院沈阳应用生态研究所 大青沟沙地生态实验站, 沈阳 110016;
    2中国科学院研究生院, 北京 100039
  • 收稿日期:2006-03-13 修回日期:2006-05-11 出版日期:2006-11-10 发布日期:2006-11-10

Effects of nitrogen fertilization on biomass partitioning and leaf physiological characteristics of Pinus sylvestris var. mongolica seedlings on sandy soil

DENG Bin1,2; ZENG Dehui1   

  1. 1Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2006-03-13 Revised:2006-05-11 Online:2006-11-10 Published:2006-11-10

摘要: 设计5个氮肥(NH4NO3)添加水平(g·m-2):0(CK)、10.0(N1)、20.0(N2)、40.0(N3)和50.0(N4),研究了沙地樟子松幼苗生长与生理学指标的季节变化。结果表明,添加氮肥促进了幼苗的高生长、相对生长速率、单株总生物量的增加,对叶片相对含水量没有影响;N4水平促进了叶片脯氨酸含量的积累。单叶重、株高、地径、叶重比、叶绿素(a+b)、叶绿素a以及叶绿素b含量等均在N3水平下达到最大值。在1个生长季的观测中,添加氮肥主要促进了樟子松幼苗在5~7月份的生长,其中N3水平对樟子松幼苗生长发育的促进作用最大。

关键词: 硅藻, 种类组成, 生态分布, 长江口

Abstract: Five nitrogen (NH4NO3) fertilization levels (g·m-2), i.e., 0 (CK), 10.0 (N1), 20.0 (N2), 40.0 (N3) and 50.0 (N4), were employed to evaluate the effects of nitrogen fertilization on the growth and leaf physiological characteristics of Pinus sylvestris var. mongolica seedlings on sandy soil. Indexes of growth and foliar physiology were measured in May, July, and September, respectively. Nitrogen addition significantly increased plant height, relative growth rate, and biomass per plant, but not for relative water content in leaves. Obvious proline accumulation was found for N4 level. The highest values of biomass per leaf, plant height, basal diameter, leaf mass ratio, contents of chlorophyll (a+b), chlorophyll a and chlorophyll b were found for N3 treatment. Nitrogen addition mainly promoted the growth of P. sylvestris var. mongolica seedlings during May to July, and the N3 level was optimum among the five levels.

Key words: Diatom, Species composition, Ecological distribution, Changjiang River estuary