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应用生态学报 ›› 2011, Vol. 22 ›› Issue (11): 2841-2848.

• 研究论文 • 上一篇    下一篇

海拔梯度对巴郎山奇花柳叶片δ13C的影响

冯秋红1,2,程瑞梅1,史作民1**,刘世荣1,刘兴良2,何飞2,曹慧明1   

  1. 1中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091;2四川省林业科学研究院, 成都 610081
  • 出版日期:2011-11-18 发布日期:2011-11-18

Effects of altitudinal gradient on Salix atopantha foliar δ13C.

FENG Qiu-hong1,2, CHENG Rui-mei1, SHI Zuo-min1, LIU Shi-rong1, LIU Xing-liang2, HE Fei2, CAO Hui-ming1   

  1. 1State Forestry Administration Key Laboratory on Forest Ecology and Environmental Sciences, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; 2Sichuan Academy of Forestry, Chengdu 610081, China
  • Online:2011-11-18 Published:2011-11-18

摘要: 2010年在四川卧龙自然保护区选择海拔为2350、2700、3150和3530 m的4个分布地点,研究了巴郎山海拔梯度对奇花柳叶片13C、光合、CO2扩散导度、氮含量、光合氮利用效率(PNUE)和比叶面积(SLA)的影响.结果表明: 随着海拔的升高,目标树种叶片氮含量(尤其是单位面积氮含量)及PNUE增加,叶片13C值也随之显著增加,且海拔每升高1000 m,13C增加1.4‰;CO2扩散导度(气孔导度和叶肉细胞导度)的增加,在一定程度上阻碍了叶片13C值随海拔升高,但不足以改变13C值随海拔升高的趋势;羧化能力是羧化位点与外界CO2分压比(Pc/Pa),甚至13C的限制因子.在海拔2350~2700 m,奇花柳光合系统内部氮素分配主要受温度的影响,而2700~3530 m的光照作用可能更大.奇花柳的SLA随海拔无显著变化.

关键词: 海拔, 卧龙自然保护区, 奇花柳, 叶片δ13C

Abstract: In 2010,measurements were conducted on the foliar δ13C, photosynthesis,CO2 diffusive conductivity, nitrogen content, photosynthetic nitrogen use efficiency (PNUE), and special leaf area (SLA) of Salix atopantha at different altitudes (2350 m, 2700 m, 3150 m, and 3530 m) in Wolong Natural Reserve. With the increase of altitude, the foliar nitrogen content (especially the nitrogen content per unit leaf area, Narea) and the PNUE increased, and the foliar δ13C had a significant increase, with an increment of 1.4‰ per 1000 m altitude. The stomatal and mesophyll CO2 diffusion conductance also increased with increasing altitude, which had definite negative effect on the increase of foliar δ13C, but the effect was not strong enough. Comparing with CO2 diffusion conductance, carboxylation capacity was a more important factor limiting the Pc/Pa, and even, the foliar δ13C. At altitude 2350-2700 m, air temperature was the main factor affecting the allocation of nitrogen in S. atopantha photosynthetic system, whereas at altitude 2700-3530 m, light could be the main affecting factor. No significant difference was observed in the SLA at different altitudes.

Key words: Salix atopantha, foliar δ13C, altitude, Wolong Natural Reserve