广西植物Issue(3)：355-361,7.DOI:10.3969/j.issn.1000-3142.2014.03.014
林窗面积对香椿生长及光合生理特性的影响
Effects of forest gap size on growth and photosynthetic characteristics of Toona sinensis
摘要
Abstract
To study the growth,photosynthetic characteristics and physiological of Toona sinensis under different sizes of forest gaps,to know the response of the light intensity,we were selected three different size of forest gaps including 50 m2 (Ⅰ),100 m2 (Ⅱ),200 m2 (Ⅲ)and opening field (CK),which were in a cypress plantation in hilly region of cen-tral Sichuan.The results showed that the plant height,stem diameter,crown area of Toona sinensis were significantly influenced by increased of gap size.The three properties in opening field were significantly lower than which in other size of forest gaps,and those properties in gapⅡwere the largest.The net photosynthetic rate at noon,intrinsic quan-tum efficiency,light saturation point,highest maximum net photosynthetic rate,photosynthetic nitrogen utilization ef-ficiency,light use efficiency,chlorophyll a/b,leaf thickness,leaf fresh mass per unit leaf area,leaf dry mass per unit leaf area,nitrogen in per unit area,malondialdehyde,superoxide dismutase,soluble protein increased with the increase of gap size.On the contrary,the net photosynthetic rate of day,chlorophyll a,chlorophyll b,carotenoids decreased.So the photosynthetic capacity of Toona sinensis decreased with the increase of gap size,and to some extent had a positive <br> effect on differences of photosynthetic capacity and growth.We speculated that non-stomatal limitation was the main factor that"photosynthetic siesta"and inhibited net rate.Therefore,Toona sinensis had a good adaptability to envi-ronment and Toona sinensis could keep a high photosynthetic capacity and productive forces in gap Ⅱ at the initial stage of gap formation.关键词
香椿/林窗/光照强度/生长/光合特性Key words
Toona sinensis/forest gap/light intensity/growth/photosynthetic characteristics分类
农业科技引用本文复制引用
张军,李贤伟,范川,冯茂松,赵敏,龙玲,王佳美..林窗面积对香椿生长及光合生理特性的影响[J].广西植物,2014,(3):355-361,7.基金项目
国家“十二五”科技支撑计划项目(2011BAC09B05) （2011BAC09B05）
国家林业局中央财政林业科技推广示范项目(2010TK55) （2010TK55）
四川省科技支撑计划项目(2010NZ0049) （2010NZ0049）
