光照及氮素水平对水稻冠层叶片SPAD值动态变化的影响-论文.pdf

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1、浙江大学学报农业与生命科学版405495~5042014JournalofZhejiangUniversityAgric&LifeScihttpwwwjournalszjueducnagrE-mailzdxbnsb@zjueducnDOI103785jissn1008-9209201311141光照及氮素水平对水稻冠层叶片SPAD值动态变化的影响何俊俊杨京平*杨虎赵杏叶欣怡浙江大学环境与资源学院环境保护研究所杭州310058摘要在盆栽试验条件下研究在3个遮阴水平和5个施氮水平处理组合下水稻分蘖期、孕穗期

2、和抽穗期冠层叶片叶绿素计测定值soilandplantanalyzerdevelopmentvalueSPADvalue的空间分布规律及其差异为弱光条件下实时进行水稻叶片氮素营养诊断及优化提供依据结果表明同对照相比在遮阴条件下水稻冠层SPAD值波动幅度受到明显抑制遮光使水稻冠层叶片SPAD值下降并抑制施氮水平对水稻叶片向上位叶输送氮素的正向作用经变异系数分析发现L4叶对施氮水平变化反应最为敏感另外在中度和重度遮阴条件遮光率分别为65%和85%下可利用叶片相对叶色差值relativeSPADvalueRS

3、PAD进行氮素营养状态的诊断相对叶色差值22这一关SPADL3-L2SPADL4-L3与施氮水平呈显著线性正相关关系RL3-L2=0.87~0.97RL4-L3=0.85~0.97系不受生育期和施氮水平的影响在正常光照条件下宜选用SPADL3-L2指示水稻整个生育期氮素营养状况在日照较弱的季节或受林木遮光影响较大的田块宜选择SPADL4-L3作为诊断指标关键词水稻遮光率氮素营养叶绿素计测定值动态变化中图分类号S143.1S311S511文献标志码AEffectsoflightintensityandni

4、trogensupplyonthedynamiccharacteristicsofleafSPADvalueofricecanopyJournalofZhejiangUniversityAgric&LifeSci2014405495504*HeJunjunYangJingpingYangHuZhaoXingYeXinyi(InstituteofEnvironmentalScienceandTechnologyCollegeofEnvironmentalandResourceSciencesZhejian

5、gUniversityHangzhou310058China)SummaryTheapplicationofreal-timesite-specificnitrogenmanagementcanguaranteethehighyieldofriceandimprovetheutilizationrateofnitrogenThemanagementpointedoutthatsoilandplantanalyzerdevelopmentvalueSPADvaluecouldbeanindexfornit

6、rogenapplicationpreciseprecisionnamelyusingchlorophyllmeterasanitrogennutritiondiagnosistoolsonricePreviousstudieshadlookedattheeffectsofcultivarsgrowthstageleafpositionandotherfactorsonSPADvaluewhileresearchontheinfluenceoflightandnitrogenonricecanopySP

7、ADvalueisfewinourcountryThereforeitisnecessarytostudythedistributioncharacteristicsofSPADvalueunderlowlightconditionsAndthefeasibilityofapplyingchlorophyllmeteronnitrogennutritiondiagnosiswasinvestigatedThisarticlestudiedthemethodstooptimizenitrogennutri

8、tiondiagnosisofriceleavesunderlow-lightstressconditionwithSPADmeterPotexperimentswereconductedtostudythedistributingcharacteristicsofcanopySPADandthedistributionaldifferenceattilleringbootingandheadingstagesTherewerethreel