资源描述：
《灌溉水盐度和施氮量对棉花根系分布影响研究》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、棉花学报CottonScience2014袁26渊1冤院58~65灌溉水盐度和施氮量对棉花根系分布影响研究*闵伟,侯振安,冶军,马丽娟,杨秦赛,张婷渊石河子大学农学院资源与环境科学系袁新疆石河子832003冤摘要院通过田间小区试验袁研究了不同灌溉水盐度和施氮量对滴灌棉花根系分布的影响遥试验设置3种灌溉水盐度曰0.35尧4.61和8.04dS窑m-1渊分别代表淡水尧微咸水和咸水三种灌溉水类型冤曰施氮量为0尧240尧360和480kg窑hm-2遥结果表明袁按质量计袁棉花的根主要分布在0~20cm袁此部分占根总质量的85%~90%遥微咸水和咸水灌
2、溉棉花根的总质量显著降低袁分别较淡水灌溉减少10%和36%袁尤其在土壤表层0~20cm和下层60~100cm显著降低曰施用氮肥可以显著增加棉花根的质量遥以长度计袁棉花根集中分布在0~60cm袁此部分占总根长的87%~96%曰60cm以下根长密度明显降低遥微咸水灌溉棉花根长密度最大袁其次是咸水袁淡水灌溉最低曰淡水灌溉下袁根长密度随施氮量增加显著降低曰微咸水和咸水灌溉下袁根长密度随施氮量增加呈先增后降趋势袁其中施氮240kg窑hm-2最高遥棉花根表面积表现为微咸水>淡水>咸水袁平均根直径为微咸水>咸水>淡水袁而不同灌溉水处理间根体积的差异不显著
3、遥随着施氮量的增加袁根表面积尧根体积和平均直径均显著降低遥关键词院棉花曰咸水曰根质量曰根长密度曰空间分布中图分类号院S562.07文献标志码院A文章编号院1002-7807渊2014冤01-0058-08*MinWei,HouZhen'an,YeJun,MaLijuan,YangQinsai,ZhangTing(832003)TheeffectofirrigationwatersalinityandNapplicationrateoncotton(L.)rootdistributioninafieldexperimentwasinvesti
4、gated,withwatersalinitylevels(EC,electricalconductivity)of0.35,4.61and8.04dS窑m-1(repre-sentingfresh,brackish,andsalinewater,respectively).Nrateswere0,240,360,and480kg窑hm-2.Resultsshowedthatcottonrootmassfrom0–20cmsoildepthsmadeup85%-90%ofthetotal.Themassunderbrackishwatera
5、ndsalinewatertreatmentssignificantlydecreased;thesewere10%and36%lessthanthatunderfreshwatertreatment,especiallyinthe0–20cmand60–100cmsoillayers.CottonrootmassincreasedwithNrate.Cottonrootlengthwasmainlywithin0-60cm,representing87%-96%ofthetotal,decreasingsignificantlybelow
6、60cm.Thehighestaveragerootlengthdensitywasobservedunderbrackishwatertreatment,followedbysalinewaterandfreshwater.Underfreshwaterirrigation,rootlengthdensitysignificantlyde-creasedwithNrateincrease.Underbrackishwaterandsalinewaterirrigation,rootlengthdensityshowedatrendofin
7、itialin-creaseandthendecreasewithincreasingNrate.ThehighestrootlengthdensitywasobservedundertreatmentNrateof240kgN窑hm-2.Cottonrootsurfaceareaorderwasbrackishwater>freshwater>salinewater,butrootdiameterwasbrackish>saline>freshwater.Nodifferencewasobservedincottonrootvolumea
8、mongdifferentirrigationwatertreatments.Rootsurfacearea,volumeanddiameterdeclinedwithNrate
