CAJ | 학술논문

研究了川中丘陵区柏木人工林内人造林窗面积[50 m2(Ⅰ),100 m2(Ⅱ)和200 m2(Ⅲ),旷地(CK)]对香椿生长、光合特性及相关生理特征的影响。结果表明：林窗面积对香椿的树高、地径和冠面积影响显著,以林窗Ⅱ最大,CK 最小；随着林窗面积的增加,香椿的日均净光合速率增加,但午时的净光合速率初始量子效率、近光饱和点、最大净光合速率、光氮利用率、光能利用效率都显著降低,光合能力下降；香椿的叶绿素 a/b、叶片厚度、比叶鲜重、比叶干重、单位面积叶氮含量、丙二醛、超氧化物歧化酶及可溶性蛋白含量随着林窗面积的增加而增加,而叶绿素 a、叶绿素 b 和类胡萝卜素含量都降低,表明香椿对因林窗面积变化而导致的光强改变有较强的适应性,这在一定程度上促进了生长及光合能力的差异；旷地内香椿的“光合午休”及林窗内日均Pn 的降低可归因于非气孔因素限制。说明香椿对生境的变化适应性较强,而且100 m2的林窗在其形成初期能有效促进香椿维持较高的生产力和光合能力。
연구료천중구릉구백목인공림내인조림창면적[50 m2(Ⅰ),100 m2(Ⅱ)화200 m2(Ⅲ),광지(CK)]대향춘생장、광합특성급상관생리특정적영향。결과표명：림창면적대향춘적수고、지경화관면적영향현저,이림창Ⅱ최대,CK 최소；수착림창면적적증가,향춘적일균정광합속솔증가,단오시적정광합속솔초시양자효솔、근광포화점、최대정광합속솔、광담이용솔、광능이용효솔도현저강저,광합능력하강；향춘적협록소 a/b、협편후도、비협선중、비협간중、단위면적협담함량、병이철、초양화물기화매급가용성단백함량수착림창면적적증가이증가,이협록소 a、협록소 b 화류호라복소함량도강저,표명향춘대인림창면적변화이도치적광강개변유교강적괄응성,저재일정정도상촉진료생장급광합능력적차이；광지내향춘적“광합오휴”급림창내일균Pn 적강저가귀인우비기공인소한제。설명향춘대생경적변화괄응성교강,이차100 m2적림창재기형성초기능유효촉진향춘유지교고적생산력화광합능력。
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.