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Effect of Forest Gaps on the Photosynthetic Physiology of Castanopsis kawakamii seedlings
TANG Rong #,HE Zhongsheng,LIU Jinfu *,SU Songjin,ZHENG Shiqun,HONG Wei
College of Forestry, Fujian Agriculture and Forestry Universit, Fuzhou 350002
*Correspondence author
#Submitted by
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Funding: the Key Program of Natural Science Foundation of Fujian Province of China （No.2008J0008）, Scientific Research Foundation for A level Ph.D Graduates in FAFU （No.KXML2008A）, Youth Foundation of FAFU（No.k13xjj08a）, Study Abroad for Young Scholar of China Scholarship Council （No.201307870056）
Opened online:17 April 2015
Accepted by: none
Citation: TANG Rong,HE Zhongsheng,LIU Jinfu.Effect of Forest Gaps on the Photosynthetic Physiology of Castanopsis kawakamii seedlings[OL]. [17 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4637682
 
 
The variations of photosynthetic physiology in plants were the dominant factors that could affected seedlings' dynamic growth. The objective of this study was to explore the effects of weak light on photosynthetic physiology of C.kawakamii seedlings by the measurements of chlorophyll contents, net photosynthetic rate (Pn), and chlorophyll fluorescence in forest gaps and non-gaps. The results showed that: (1) the contents of chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (total Chl) of C.kawakamii seedlings in forest gaps were lower than those of non-gaps while the value of chlorophyll a/b (Chl-a/b) in forest gaps was higher than that of non-gaps. The increase of Chl-b content improved the absorption of light energy which could conducive to enhance the adaptability of seedlings in non-gaps under the weak light condition, (2) the Pn of C.kawakamii seedlings in forest gaps was higher than those of non-gaps, which showed that the formation of forest gaps could improve seedlings' photosynthetic capacity and promote their growth, and (3) under the weak light condition, the initial fluorescence (Fo) of C. kawakamii seedlings in the low age classes of forest gaps and the high age classes in non-gaps showed an increasing trend. Weak light restrained the seedlings' photochemical efficiency with a downward trend in PSII photochemical conversion efficiency (Fv/Fm) for the low age classes of forest gaps. Photochemical quenching (qP) of C.kawakamii seedlings in forest gaps and non-gaps were sensitive to weak light and demonstrated a decreasing trend. The descending trend of Non-photochemical quenching coefficient (NPQ) for C.kawakamii seedlings in forest gaps was larger than that of non-gaps, which indicated that the decline of heat dissipation capacity constrained the growth of seedlings in forest gaps under the weak light condition. Seedlings in forest gaps could maintain a rapid photosynthetic electron transport rate under the weak light condition. This is due to the actual quantum yield of PSII photochemical (Y) showed a tiny decreasing trend in forest gaps than those of non-gaps. We concluded that weak light condition limited the growth of C.kawakamii seedlings at the low age classes of forest gaps and the high age classes of non-gaps.
Keywords:Castanopsis kawakamii; weak light; different habitats; chlorophyll fluorescence
 
 
 

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