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《Pb胁迫对红椿(Toona ciliata Roem)生长发育及Pb富集特性的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2012,31(2):284—291JoumalofAgm-EnvimnmemSciencePb胁迫对红椿(%o乃口e施仍倪尺Dem)生长发育及Pb富集特性的影响胡方洁,张健+,杨万勤,吴福忠,刘洋,刘凯,闫邦国,黄旭(四川农业大学生态林业研究所,生态林业工程省级重点实验室,成都611130)摘要:采用盆栽试验研究了酸性紫色土、钙质紫色土和冲积土上生长的一年生红椿实生苗暴露在不同浓度Pb胁迫(O、200、450mg·kg。1和2000mg·kg‘1)条件下的叶长、叶面积、生物量、各器官P
2、b含量特征和富集程度,并分析了红椿对Pb污染的耐性和转移效率。3种土壤下红椿都能生长,但相同浓度Pb胁迫下其在钙质紫色土中生长状况最佳,在冲积土中生长状况最差。随Pb浓度增大红椿叶片生长受到明显抑制,当土壤中Pb浓度在2000mg·kg。1时,其叶长和叶面积与对照差异极显著(P3、浓度成正相关(P<0.01),其6个器官中细根Pb含量最高,粗根次之,而地上部分的Pb含量较低且差异不大。红椿耐性指数值在0.67—1.06之间,表现为随Pb胁迫浓度增太,其耐性呈下降趋势。红椿富集系数与转移系数都较小且小于0.3。这些结果表明,红椿能在Pb污染较严重的土壤中较好的生存,可作为Pb污染区域潜在的土壤修复树种。关键词:红椿;Pb胁迫;耐性;植物修复;土壤类型中图分类号:x173文献标志码:A文章编号:1672—2043(2012)02—0284—08E骶ctsofPbStressonthe4、Grow廿l,DeVelopmentandPbEnriclllllentPropertiesof乃DMc玩咖勘删SapHngsHUFang_jie,ZHANGJi肌+,YANGWan—qin,WUFu—zhong,UUYang,UUKai,YANBang—guo,HUANGxu(SichuanPmvincialKeyLaboratoryofEc010百calForestryEngineering,InstituteofEcologicalForestry,SichuanAgriculturalUnive5、rsity,Chengdu611130,China)Abs咖ct:Toch眦ctertlleg洲handPbenrichmentpropertiesof%omciZ池ⅡunderPbpoⅡutedsoils,1eaflen殍h,leafarea,biomass,肌dPbconcentI叫ioninoqgansofone-yea卜oldzciz泐口samplingswereinvestigatedunderdi骼remPbtreatments(0mg·kg-l'200mg·kg_1,450mg·kg一1a6、nd2000mg·kg-1)inacidpurplesoil,alkalinepurplesoilandalluvialsoilinwe8temSichuan,China.Zci2in抛showedgoodgro州hcharacteristicsinthreesoiltypes,especiallyinalkalinepu巾lesoils.IncreaLsedPbstressobviouslyinhibitedle“gm卅hreg砌essofsoilsubstrate.r11lehighestPbs讹s7、s(2000mg·kg_1)sigIlific粕Ⅱy(P<0.01)reducedleaflengthandareainc咖p耐sonwimcontml_Pbs讹ssobviouslychallgedtllemot,shootmtiooftIlesaInplingsandincreasedleafliners.Thetotalbiomasswasdecreasedsignificantly(P8、essonlydecreasedto81.47%of山ebiomassincontr01.Pbconcentrationinrci鼬es蛐plingswaspositively(P.
3、浓度成正相关(P<0.01),其6个器官中细根Pb含量最高,粗根次之,而地上部分的Pb含量较低且差异不大。红椿耐性指数值在0.67—1.06之间,表现为随Pb胁迫浓度增太,其耐性呈下降趋势。红椿富集系数与转移系数都较小且小于0.3。这些结果表明,红椿能在Pb污染较严重的土壤中较好的生存,可作为Pb污染区域潜在的土壤修复树种。关键词:红椿;Pb胁迫;耐性;植物修复;土壤类型中图分类号:x173文献标志码:A文章编号:1672—2043(2012)02—0284—08E骶ctsofPbStressonthe
4、Grow廿l,DeVelopmentandPbEnriclllllentPropertiesof乃DMc玩咖勘删SapHngsHUFang_jie,ZHANGJi肌+,YANGWan—qin,WUFu—zhong,UUYang,UUKai,YANBang—guo,HUANGxu(SichuanPmvincialKeyLaboratoryofEc010百calForestryEngineering,InstituteofEcologicalForestry,SichuanAgriculturalUnive
5、rsity,Chengdu611130,China)Abs咖ct:Toch眦ctertlleg洲handPbenrichmentpropertiesof%omciZ池ⅡunderPbpoⅡutedsoils,1eaflen殍h,leafarea,biomass,肌dPbconcentI叫ioninoqgansofone-yea卜oldzciz泐口samplingswereinvestigatedunderdi骼remPbtreatments(0mg·kg-l'200mg·kg_1,450mg·kg一1a
6、nd2000mg·kg-1)inacidpurplesoil,alkalinepurplesoilandalluvialsoilinwe8temSichuan,China.Zci2in抛showedgoodgro州hcharacteristicsinthreesoiltypes,especiallyinalkalinepu巾lesoils.IncreaLsedPbstressobviouslyinhibitedle“gm卅hreg砌essofsoilsubstrate.r11lehighestPbs讹s
7、s(2000mg·kg_1)sigIlific粕Ⅱy(P<0.01)reducedleaflengthandareainc咖p耐sonwimcontml_Pbs讹ssobviouslychallgedtllemot,shootmtiooftIlesaInplingsandincreasedleafliners.Thetotalbiomasswasdecreasedsignificantly(P8、essonlydecreasedto81.47%of山ebiomassincontr01.Pbconcentrationinrci鼬es蛐plingswaspositively(P.
8、essonlydecreasedto81.47%of山ebiomassincontr01.Pbconcentrationinrci鼬es蛐plingswaspositively(P.
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