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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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

Received: 25 August 2012

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	LI Zhong-fei
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Cite this article:

LI Zhong-fei,ZHENG Zheng. Photosynthetic characteristics of Ardisia tenera saplings in understory of tropical seasonal rain forest in different seasons in Xishuangbanna, China[J]. , 2012, 31(4): 364-369.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2012/V31/I4/364

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