施用城市污泥对小叶黄杨光合特性和生长的影响

施用城市污泥对小叶黄杨光合特性和生长的影响*白莉萍1,2**摇宋金洪1,2摇辛摇涛1,2摇伏亚萍1,2(1中国林业科学研究院森林生态环境与保护研究所,北京100091;2国家林业局森林生态环境重点实验室,北京100091)摘摇要摇城市污泥作为有机肥料施用于园林植物已备受关注.本研究利用温室盆栽试验,分别设置不同用量城市污泥[低量(LC)、中量(MC)和高量(HC)]处理和无机肥(IF)处理,并以不施肥料和污泥为对照(CK),研究不同用量城市污泥对小叶黄杨幼苗光合特性和生长的影响.结果表明:施用城市污泥可以提高小叶黄杨幼苗叶片叶绿素和氮素含量,但随污泥施用量的增加,叶片净光合速率(Pn)呈下降趋势.在生长季的8月,与IF处理和CK相比,LC、MC处理的叶片Pn均提高,而HC处理却较IF和CK分别降低了25郾9%和8郾9%;至10月,LC、MC和HC处理的叶片Pn均低于IF处理,但LC处理的Pn仍高于CK,而MC、HC处理的Pn均低于CK,其中HC处理的Pn较IF处理和CK分别降低了48郾4%和29郾2%.IF处理小叶黄杨植株的株高、地径和根长最大,LC处理次之,且地上生物量最大;MC处理除了株高和地上生物量高于CK外,根长和地径均低于CK;而HC处理则严重抑制了根系的生长.小叶黄杨幼苗的城市污泥施用量应限制在30t·hm-2以内.关键词摇小叶黄杨摇堆肥污泥摇有机肥料摇光合作用摇生长文章编号摇1001-9332(2010)04-1026-05摇中图分类号摇Q494摇文献标识码摇AEffectsofsewagesludgeapplicationonleafphotosynthesisandplantgrowthofBuxusmicro鄄phylla.BAILi鄄ping1,2,SONGJin鄄hong1,2,XINTao1,2,FUYa鄄ping1,2(1InstituteofForestEcolo鄄gy,EnvironmentandProtection,ChineseAcademyofForestry,Beijing100091,China;2StateFor鄄estryAdministrationKeyLaboratoryofForestEcologyandEnvironment,Beijing,100091,China).鄄Chin.J.Appl.Ecol.,2010,21(4):1026-1030.Abstract:Theapplicationofurbansewagesludgeasanorganicfertilizerforgardenplantshasob鄄tainedanincreasingattention.TakingBuxusmicrophyllaseedlingsastestobjects,agreenhousepotexperimentwasconductedtostudytheresponsesoftheirphotosyntheticcharacteristicsandgrowthtotheapplicationofsewagesludge(SS).Fivetreatmentswereinstalled,i.e.,lowdosageSS(LC),mediumdosageSS(MC),highdosageSS(HC),inorganicfertilizers(IF),andcontrol(noap鄄plicationofsewagesludgeandinorganicfertilizers,CK).TheapplicationofSSincreasedthechlo鄄rophyllandNcontentsinB.microphyllaseedlingsleaves,butwiththeincreaseofSSdosage,thenetphotosyntheticrate(Pn)decreased.InAugust,treatmentsLCandMCincreasedthePn,butHCdecreasedthePnby25郾9%and8郾9%,respectively,comparedwithIFandCK.InOctober,treatmentsLC,MCandHCdecreasedthePn,comparedwithIF,butthePninLCwasstillhigherthanthatofCK.ThePnintreatmentsMCandHCwaslowerthanthatofCK,andthePninHCwas48郾4%and29郾2%lowerthanthatinIFandCK,respectively.Theplantheight,basaldiameter,androotlengthwer