生杉木不同部位和叶龄针叶光响应研究

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1、维普资讯http://www.cqvip.com第21卷第3期生态学报Vo1．21+No．32001年3月ACTAECOL0GICASINICAMar．．200l18年生杉木不同部位和叶龄针叶光响应研究张小全，徐德应(中国林业科学院森#生态环境与保护研究所，北京100091)摘要：在最适湿度(3O±l℃)、适宜程度(70％士5％)和正常大气CO2难度(35oiio×ioW／v)向下，采用话体铡定方法，定丁l8年生杉木不局部位和叶蛰针叶对光jl}的稳卷和动态响应。结果表明不屑都位和叶龄针叶净光音建率(Pn)的光睛应特征有明显差异，

2、从上部到下部、占L当年生到1年生至2年生t针叶饱和光强(PSL1)和光补偿点(LCp)降低t袁班量子效率()提高经一定时间暗处理后．针叶需要一定光诱导才能获得相应光强下的最大光诱导期长短与猝盅性光强以厦叶蛰和针叶在树冠中所址的部位有关猝发性光照越强，所需的光诱导甥地长j下部针叶光诱导期艋于中部针叶f而1年生针叶短于当年生针叶不同部位针叶对穗卷和动态光照的睛应与针叶长期适应所趾的光环境有差．而不同叶龄的差异瞬与生理活性有关外．也可能与所扯的光环境有关关■词：移丰I净光音速率；光响应f光诱导Lightresponsesof18一ye

3、ar—oldChinafirshootsinrelationtoshootagesandpositionswithincrownZHANGXiao—quan，XUDe—Ying(R㈣^InstituteofF~estEcoiogy，En~iroromem口ndProteezi~．ChlneseAcademyofForestry，Beo'ing100091．CMna)Abstract：Stableanddynamiclightresponsesfornetphotosyntheticrateof18一year—oldChinafi

4、rshootswithdifferentageandpositionwithinthetreecrownwereiI'teasuredunderoptimumtemperature(30士l0℃)arLdhumidity(70士5)forphotosynthesisarLdnormalamhientCO2(350士10×1OV／V)．Re—sultsshowedthatPn，photosyntheticsaturatedlightintensitytPsLl1andlightcompensztionpoint(LCP)ofsho

5、otsdecreasedfromuppercrownthroughmid—crowntolower—crownwhileapparentphotou—tilizationefficiency(d)increased．Withtheagingofshoots，P，PSLIaridLCPalsodecreasedwhiledinGreasedtoo．Afteracertainperiodofdarknesstreatment，aphotoinductionprocesswasrequiredtOgetmaximumPn．Howeve

6、rthelengthofinductionperioddependedonsuddenlightinfensity，shootageandpositionwithinthetreecrown．Thehigherthesuddenlightintensity．thelongertheinductionperiod．Theinducfionperiod0fshootsatlowercro％vnwasshorterthBn母id—crown，andthatofcurrenrshootswaslongerthan1一year—oldsh

7、oots．Itissuggestedthatdifferentstableanddynamicresponsesbetweendiffer—entpositionswererelatedtomicro—lightenvironmentwhichshootsacclimatedinalongterm．whilethedifferencesbetweendifferentshotageswereassociated1％0tonlytOphysiologicalactivitieso{shootsbutalsoresultedfrom

8、acclimatedmicrolightenvironment．Keywords：Chinafir；netphotosyntheticrate；lightresponse1：photo—indt~ction立章■号：1000-0933(2001)030409—0