华北高寒区4种根茎类喜凉作物的光合特性-论文.pdf

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1、华北农学报·2015。30(2)：212—219华北高寒区4种根茎类喜凉作物的光合特性王伟婧，张继宗，郝雅星，韩凯虹，张立峰(1．河北农业大学农学院，河北保定071000；2．农业部张北农业资源与生态环境重点野外科学观测试验站，河北张家口076450)摘要：为了明确高光低温环境下喜凉类根茎作物的光温生态适应性，为区域农作物选育与生产配置提供理论依据。采用LI-6400光合仪监测了华北高寒区白萝b、苤蓝、芥菜、甜菜的光合日变化及其季节动态。在华北高寒区，4种喜凉类根茎作物Pn日进程呈现7，8月双峰、9月单峰特征。7，8月的午间“Pn低效期”由叶片受到高温胁

2、迫而挥霍耗水，及相继的气孔部分关闭和叶肉细胞活性降低等因素引发。不同作物的DPC与DTC呈现8月>7月>9月；苤蓝LUE与WUEd明显高于甜菜，芥菜、白萝b居中。霜后苤蓝、芥菜的DPC尚有霜前的46．7％，60．0％，甜菜霜后DPC比霜前增高了9．22％。苤蓝与甜菜的亚喜凉特性，使之具有生育期长和光合势大的潜力，对华北高寒区的光温资源具有优异的适生性。关键词：光合特性；Pn低效期；白萝卜；甜菜；苤蓝；芥菜中图分类号：$63．Ol文献标识码：A文章编号：1000—7091(2015)02—0212—08dol：10．7668／hbnxb．2015．02．0

3、36StudiesonPh0tOsyntheticCharacteristicsofFourCold-resistingRhizomatousCropsinAlpine-coldRegionsofNorthChinaWANGWei．jing'，ZHANGJi—zong’。，HAOYa．xing'，HANKai—hong’，ZHANGLi—feng'(1．CollegeofAgronomy，AgriculturalUniversityofHebei，Baoding071000，China；2．ZhangbeiAgriculturalResourceandE

4、cologicalEnvironmentKeyFieldResearchStation，MinistryofAgriculture，Zhangjiakou076450，China)Abstract：Inordertoclarifyclod·resistingrhizomatouscropsphoto·thermalecologicaladaptationwithhigh-lightandlow—temperatureenvironmentandprovidetheoreticbasisforcorpbreedingandstructureregulati

5、on．LI一6400portablephotosynthesissystemwasusedtomonitorthediurnalvariationsofthephotosyntheticrateindifferentperiodsofradish，beets，kohlrabi，mustardinAlpine—coldNorthChina．InAlpine—coldRegionsofNorthChina，thediurnalvariationofnetphotosyntheticrate(Pn)offourcold-resistingrootcropsex

6、hibiteddual—peakcurvesinJulyandAugust，andthedepressionofPnwasmainlyduetomakethriftlesslyuseofwaterbecauseofhightemperaturestressthatledinincompletestomatalclosureandlowphotosyntheticactivityofmesophyllcel1．Thediurnalvariation0fPnmainlypresentedasinglepeakcureinSeptember．Allofthem

7、variationofdiurnalphotosyntheticcapacity(DPC)andthevariationofdiurnaltranspirationcapacity(DTC)wereintheorderofAugust>July>September．Thekohlrabisbothdailywateruseeficiency(WUEd)anddiurnalvariationsoflightutilizationeficiency(LUE)weresignificantlyhigherthanthatofbeet，mustardandrad

8、ishlyinginbetween．Theafter—frostingDPCof