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1、棉花学报CottonScience2016,28(4):361―368不同冠层结构对棉田小气候及蕾铃脱落和产量的影响1111,211,211*任锋潇袁孙红春袁张永江袁白志英袁刘连涛袁张颖袁陈静袁李存东渊1.河北农业大学/河北省作物生长调控重点实验室袁河北保定071000曰2.河北农业大学生命科学学院袁河北保定071000冤摘要院为探讨黄河流域不同冠层结构下棉花产量及田间微环境差异袁对去叶枝渊T1冤尧去叶枝高矮相间渊T2冤尧留叶枝渊T3冤尧留叶枝高矮相间渊T4冤4个群体结构下棉花的产量和微环境进行研究遥结果表明院冀棉958和农大棉601的留叶枝群体在各时期的底部透光率均显著降
2、低袁而T4群体底部透光率显著高于T3群体曰各时期CO2浓度与温度尧湿度均成显著偏相关关系袁花铃期高矮相间群体下层的CO2浓度平均比空气中提高8.69%～11.63%袁而中层CO2浓度降低1.66%～4.24%遥T4群体冠层内的温度显著降低袁棉花群体下层的湿度和CO2浓度显著提高曰去叶枝群体脱落率较低袁籽棉产量显著高于留叶枝群体曰高矮相间群体籽棉产量高于常规群体曰冀棉958和农大棉601的T4群体籽棉产量比T3群体分别提高15.79%和10.81%遥因此袁留叶枝群体采用高矮相间冠层明显改善棉田中下层微环境袁降低脱落率袁提高铃数袁有利于形成产量遥关键词院冠层结构曰透光率曰棉田微
3、环境曰产量曰CO2浓度中图分类号院S562.01文献标志码院A文章编号院1002-7807渊2016冤04-0361-0810.11963/issn.1002-7807.2016040071111,211,21RenFengxiao,SunHongchun,ZhangYongjiang,BaiZhiying,LiuLiantao,ZhangYing,ChenJing,Li1*Cundong(1.071000,;2.071000,)Toconsiderthedifferenceofcottonyieldandthefieldmicro-environmentunderdiff
4、erentcanopystructuresintheYellowRiverbasin,westudiedcottonstrainsJimian958andNongdamian601underfourdifferentcanopystructures.Differentcanopystructureswerecreatedthroughvegetativebranchremoval(T1,regulargroup),high(towrows)andlow(towrows)plant-alternatedvegetativebranchremoval(T2,irregularg
5、roup),vegetativebranchretention(T3,regulargroup),andhigh(towrows)andlow(towrows)plant-alternatedvegetativebranchretention(T4,irregulargroup).TheresultsshowedthatthelighttransmittancesatthebottomofcanopyinvegetablebranchretentiongroupsweresignificantlyreducedinJimian958andNongdamian601;howe
6、ver,thelighttransmittanceatthebottomoftheT4groupwassignificantlyhigherthanthatoftheT3group.TheCO2concentrationhassignificantpartialcorrelationswithtemperatureandhumidityineachstage.Duringthefloweringandbloomingstage,comparedwithCO2concentrationintheair,theCO2concentrationinthedownlayerofhi
7、ghandlowplant-alternatedgrouponaverageincreased8.69%―11.63%,andthatinthemiddlelayerreducedby1.66%―4.24%.Thewithin-canopytemperaturedecreasedsignificantlyintheT4group,andthecottongroupdown-layerhumidityandCO2concentrationincreasedsignificantly.Thevegetativebran
