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元谋干热河谷几种外来树种在旱季的光合特点
引用本文:马焕成,吴延熊.元谋干热河谷几种外来树种在旱季的光合特点[J].浙江林学院学报,2001,18(1):46-49.
作者姓名:马焕成  吴延熊
作者单位:1. 西南林学院 生态工程研究所,云南 昆明,650224
2. 云南省林业科学院 森林培育与开发重点实验室,云南 昆明 650206
3. Institute of Geography,School of Earth Sciences,Victoria University of Wellington,Wellington,New Zealand
基金项目:云南省中青年学术和技术带头人培养基金资助项目! (98C0 6 0M),云南省基础研究基金资助项目! (98C0 12G)
摘    要:在云南省元谋县苴林乡3年生的人工林,采用Li-6200野外光合测定系统对引进元谋干热河谷的马占相思、大叶相思、厚荚相思、绢毛相思、肯氏相思、赤桉、窿缘桉和柠檬桉等8个树种进行了光合测定,结果发现8个树种的净光合速率日进程都表现为双峰曲线,2个峰值分别出现在9:00和15:00(肯氏相思、大叶相思和厚荚相思出现在17:00);最低降低光合速率的特征,造成光合作用的“午休”现象,从而提高水分利用效率的调节能力,这是它们对元谋干热河谷干热气候的一种适应,这种适应性的调节方式,对它们的节水和生存是有利的,表4参10。

关 键 词:干热河谷  旱条  光合作用  桉树  相思树  生态适应性  树种选择  “午休”现象

Photosynthetic characteristics of several exotic species in dry season in Yuanmou County
Abstract:The measurements of diurnal pattern of net photosynthetic rate ofAcacia mangium,A. aulacocarpa,A. auriformis,A. holosericea,A. cunninghamii,Eucalyptus camaldulensis,E. exserta,E. citriodora were carried out in three year old stands in Zulin twonship,Yuanmou County.The net photosynthesis rate in eight species showed the double-peak pattern during the drought period.The maximum of photosynthetic rate appeared at 9:00 and 15:00 respectively (A. aulacocarpa,A. auriformis and A. cunninghamii at 17:00).The minimum appeared at 13:00(A. cunninghamii at 15:00).The photosynthesis patterns in eight species showed significant midday depression caused by the closure of stomata.This midday depression must be one of the adaptation of the plant to the climate of dry-hot valley,regulating the moisture condition in the stand and saving the water for survival.
Keywords:dry  hot  valley  photosynthesis  Eucalyptus  Acacia  ecotopic  adaptation
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