不同季节西双版纳热带雨林细罗伞幼树光合特性的变化

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摘要

利用Li-6400光合作用测定仪,西双版纳热带季节雨林林下细罗伞幼树(Ardisia tenera)在雾凉季(1月)、干热季(4月)和雨季(7月)的光合光响应特征及光合速率日变化被测定.结果显示:人工光源下,细罗伞幼树Pn_max、c、a均以雨季中最大,分别为2.782μmol/(m²·s)、1.233μmol/(m²·s)和0.007,各季节中LSP、LCP均偏低;林下自然光照环境中,3个季节细罗伞幼树Pn均出现双峰型特征,雾凉季、干热季和雨季的最大峰值分别为1.288μmol/(m²·s)、1.919μmol/(m²·s)、2.5μmol/(m²·s),雨季中一天中的Pn和Gs最大,雾凉季的Tr最小,但WUE却最高.林下细罗伞幼树光合特性随季节而发生显著变化,且表现出耐荫的特性,总体上细罗伞幼树对CO₂的净吸收通量较低.

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关键词 ：季节雨林, 细罗伞, 光合, 西双版纳

Abstract：

Light response characteristics and diurnal variation of photosynthesis of young trees of Ardisia tenera were measured with Li-6400 in fog-cool season,dry-hot season and rain season in understory of tropical seasonal rain forest in Xishuangbanna.The results show that Pn_max、c and a of young tree of A.tenera in rain season are the highest,which are 2.782μmol/(m²·s),1.233μmol/(m²·s)and 0.007 respectively in artificial illuminant,and LSP and LCP are comparatively low in each season as a whole.In environment of natural illumination,the diurnal process of Pn for young tree living in the understory shows a "bimodal pattern" in fog-cool season,dry-hot season and rain season,and the peak values were 1.288μmol/(m²·s),1.919μmol/(m²·s)and 2.5μmol/(m²·s)respectively.Pn and Gs in rain season are the highest.Tr is the lowest,but WUE is the highest in fog-cool season.Thus,photosynthetic characteristics of young trees of A.tenera were largely influenced by change of seasons,and these characteristics reveal the shade-tolerant characteristics of young trees of A.tenera.Overall,the net flux that young trees of A.tenera absorb carbon dioxide is relatively low.

Key words： Rain forest Ardisia tenera photosynthesis

收稿日期: 2012-08-25

Q494

基金资助:云南省科技计划项目资助(2009ZC084M);云南省教育厅科技计划项目(08C0093);西南林业大学生态学校级重点建设学科项目(XKX200902);国家自然科学基金项目(30170168)

引用本文:

栗忠飞1,2*, 郑征2. 不同季节西双版纳热带雨林细罗伞幼树光合特性的变化[J]. , 2012, 31(4): 364-369.
LI Zhong-fei1,2, ZHENG Zheng2. Photosynthetic characteristics of Ardisia tenera saplings in understory of tropical seasonal rain forest in different seasons in Xishuangbanna, China. , 2012, 31(4): 364-369.

链接本文:

http://www.ecolsci.com/CN/Y2012/V31/I4/364

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