欢迎访问林业科学,今天是

林业科学 ›› 2010, Vol. 46 ›› Issue (8): 84-90.doi: 10.11707/j.1001-7488.20100813

• 论文 • 上一篇    下一篇

巨尾桉光合特征与水分消耗的季节适应

邓云1,2,张磊2,3,王冰2,苏文华2,张光飞2,邓晓保1   

  1. 1. 中国科学院西双版纳热带植物园 勐腊 666303; 2.云南大学生态学与地植物学研究所 昆明 650091; 3.云南新兴职业学院 昆明 650501
  • 收稿日期:2009-05-20 修回日期:2010-06-21 出版日期:2010-08-25 发布日期:2010-08-25
  • 通讯作者: 苏文华

Seasonal Variations in Photosynthesis and Water Use Efficiencyof Eucalyptus grandis × E. urophylla

Deng Yun1,2;Zhang Lei2,3;Wang Bing2;Su Wenhua2;Zhang Guangfei2;Deng Xiaobao1   

  1. 1.Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences Mengla 666303;2.Institute of Ecology and Geobotany,Yunnan University Kunming 650091; 3.Yunnan Xinxing Occupations Institute Kunming 650501
  • Received:2009-05-20 Revised:2010-06-21 Online:2010-08-25 Published:2010-08-25

摘要:

使用Li-6400于旱季和雨季分别对云南省澜沧地区种植巨尾桉的净光合速率和蒸腾速率、气孔导度进行测定。研究发现: 雨季巨尾桉光饱和点达1 590 μmol photon·m-2 s-1,而旱季土壤水分不足时光饱和点仅867 μmol photon·m-2 s-1,光补偿点亦有下降。旱季气孔导度对蒸腾和光合的限制作用明显强于雨季。旱季巨尾桉气孔限制强度及蒸腾对光强变化的响应均与本地植物红木荷类似,而雨季巨尾桉的净光合速率远高于后者。巨尾桉具有与环境水分供应变化相协调的水分利用策略,旱季减少水分消耗以尽量节水,雨季则充分光合以获得更多生长。其类似本地植物季节变化的蒸腾特征和水分利用对策有利于维持群落地段的水分平衡。

关键词: 巨尾桉, 光合速率, 蒸腾特征, 水分利用效率

Abstract:

The photosynthesis,transpiration and stomatal conductance of Eucalyptus grandis×E.urophylla was studied under different seasons in Lancang,Yunnan Province with Li-6400. Result showed that LSP of E.grandis×E.urophylla was 1 590 μmol photon·m-2 s-1 in rainfall season,and decreased to 867 μmol photon·m-2 s-1 in dry season. Seasonal drought enhanced stomatal limitation to both photosynthesis and transpiration. E.grandis×E.urophylla had similar change patterns of stomatal conductance and transpiration in response to irradiation intensity as native species Schima wallichii in dry season,but the photosynthesis was much higher than Schima wallichii. E.grandis×E.urophylla could adapt different water conditions in different seasons as native species.

Key words: Eucalyptus grandis×, E.urophylla, photosynthesis, transpiration, water use efficiency