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页数:8页
时间:2018-04-16
《设施砂壤土容重对番茄幼苗生长和根系构型的影响》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、园艺学报,2015,42(7):1313–1320.ActaHorticulturaeSinicadoi:10.16420/j.issn.0513-353x.2014-1144;http://www.ahs.ac.cn1313设施砂壤土容重对番茄幼苗生长和根系构型的影响*刘晚苟,何泳怡,谢海容,李良贤(岭南师范学院生命科学与技术学院,广东湛江524048)摘要:土壤紧实是设施蔬菜生产的土壤障碍因子之一。在塑料大棚砂壤土条件下,用人工土柱栽-3培法研究了土壤容重分别为1.20、1.35和1.58g·cm的土壤对番茄幼苗生长和根系构型的影响。结果表明,随
2、容重增大,叶片伸长速度、株高、植株含水量、鲜质量、干质量、根冠比、根表面积、根长密度和根体积密度等都显著降低。随容重增大,根系干质量、根表面积、根长密度和根体积密度在垂直面上-3的分布显著降低,容重1.58g·cm处理的根系全部分布在0~6cm土层内。高容重土壤使根毛区皮层产生形变,即细胞变长,皮层下陷,根表面凹凸不平,根圆度变差,偏心率增大,降低根毛区的吸收能力。关键词:番茄;土壤容重;生长;根系构型中图分类号:S641.2文献标志码:A文章编号:0513-353X(2015)07-1313-08EffectsofBulkDensityofSand
3、yLoamSoilonSeedlingGrowthandRootArchitectureofTomatoPlantsinGreenhouse*LIUWan-gou,HEYong-yi,XIEHai-rong,andLILiang-xian(LifeScienceandTechnologySchool,LingnanNormalUniversity,Zhanjiang,Guangdong524048,China)Abstract:Soilcompactionisoneofsoilrestrictingfactorsforgreenhousevegeta
4、bleproduction.The-3effectsofbulkdensityof1.20(D1.20),1.35(D1.35)and1.58g·cm(D1.58)insandyloamonseedlinggrowthandrootarchitectureoftomatowereinvestigatedusingsoilcolumnsingreenhouse.Theresultsshowedthatleafelongationrate,plantheight,plantwatercontent,freshanddryweight,roottoshoo
5、tratioswerenegativelycorrelatedwithsoilbulkdensity.Rootsurfacearea,rootlengthdensityandrootvolumedensityalsodecreasedsignificantlywithincreasingsoilbulkdensity.Highbulkdensityinhibitedrootpenetrationtodeepsoil,andconsequentlyinfluencedrootdistribution,e.g.rootswereconfinedtothe
6、top6cmsoilsinD1.58treatment.Insoilprofile,thedistributionofrootmass,rootsurfacearea,rootlengthdensityandrootvolumedensitydecreasedsignificantlywithincreasingsoilbulkdensity.Inroothairzone,rootinvaginationandcelldeformationoccurredinoutercortexunderD1.58,andtheroundness(R)andecc
7、entricity(e)ofroottransversesectionincreasedsignificantlywithincreasingbulkdensity,whichindicatedthattheabilityofrootuptakewoulddecrease.Itisconcludedthatadecreaseinsoilcultivationlayerwouldinhibitrootgrowthofthedeep-rootvegetablessuchastomatoplant.收稿日期:2015–03–24;修回日期:2015–05–
8、20基金项目:国家星火计划项目(2012GA780012);岭南师范学院自然科学研究重点项目(LZL1405
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