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ID:9016320
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页数:5页
时间:2018-04-15
《不同水肥模式下水稻光合光响应特性研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、16中国农村水利水电·2015年第7期文章编号:1007-2284(2015)07-0016-05不同水肥模式下水稻光合光响应特性研究陈劲丰,时元智,崔远来,韩焕豪,李硕林(武汉大学水资源与水电工程科学国家重点实验室,武汉430072)摘要:为揭示不同水肥模式对水稻分蘖期和拔节孕穗期叶片光合作用光响应特征的影响,在2种灌溉模式、2种施肥次数和4个施氮量水平下,开展了不同水肥模式的水稻叶片光合作用的光响应特征研究。结果表明,在水稻分蘖期和拔节孕穗期,间歇灌溉水稻的净光合速率高于淹灌,且随着施氮量的提高,这种由于灌溉模式引起的差异将被弱化。在施氮量较低时,淹灌水稻很快就达到了光饱和,而
2、在间歇灌溉下,光饱和点则明显后移。这表明低氮水平下,间歇灌溉的水稻对光的适应能力比淹灌的水稻强。灌溉模式和设计施氮量相同时,由于3次施肥在时间尺度上施肥分布更均匀,尽管其在分蘖期净光合速率较小,但在拔节孕穗期净光合速率较大,与2次施肥相比,其水稻产量更高。这表明,提高拔节孕穗期作物的净光合速率有利于作物干物质的积累,从而获得更高的产量。关键词:水稻;光合光响应;灌溉模式;施肥次数;施氮量中图分类号:S365文献标识码:AResearchontheCharacteristicsofRiceLeafPhotosyntheticLightResponseCurvewithDifferen
3、tWaterandFertilizerModesCHENJin-feng,SHIYuan-zhi,CUIYuan-lai,HANHuan-hao,QIUPei,LIShuo-lin(StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan430072,China)Abstract:Inordertorevealtheinfluenceofconditionsofirrigationandfertilizationoncharacteristicsofriceleaf
4、photosyntheticlightresponse,experimentswerecarriedouttoadopttwoirrigationmodeswithfournitrogenlevelsandtwodifferentfertilizationtimes.Leafphotosyntheticlightresponsecurvesweremeasuredatlatertilleringstageandbooting-jointingstages.Atthemeasuredstages,photosynthesisratewashigherunderintermittent
5、irrigation.Inaddition,thedifferencewasweakenedasthenitrogenlevelrose.Withlownitrogenlevels,theflushed-irrigatedriceleafreachedlightsaturationpointsLSPquickly,whiletheLSPofriceleafunderintermittentirrigationwaspostponedevidently.Itindicatedthatintermittent-irrigatedriceleafhadhigherlightadaptab
6、ilitythanflushed-irrigatedone.Whentheirrigationconditionsandnitrogeninputwerethesame,despitearelativelylowphotosynthesisrateinlatertilleringstage,thephotosynthesisratewashighinbooting-jointingstageandtheoutputishigherwhenthericeleafwasirriga-tedthreetimesasagainsttwotimes,asirrigationwasbetter
7、-distributedovertime.Itindicatesthatthedrymaterialaccumulationofriceleafcanbeenhancedbypromotingthephotosynthesisrateinbooting-jointingstage,thusincreasingoutput.Keywords:rice;photosyntheticlightresponse;irrigationmode;fertilizationtime
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