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当前位置: 首页 > 文章 > 昆虫取食对杨树富集Cd、Cu、Zn能力的影响 东北林业大学学报 2016 (3) 52-55
Position: Home > Articles > Effects of Insect Herbivory on Cd,Cu and Zn Accumulation in Populus simonii×P. nigra Journal of Northeast Forestry University 2016 (3) 52-55

昆虫取食对杨树富集Cd、Cu、Zn能力的影响

作  者：
宋蕾;王月月;高璐璐;姜礅;侯超;严善春
单  位：
东北林业大学
关键词：
小黑杨;重金属胁迫;昆虫取食
摘  要：
为探讨昆虫取食对杨树富集Cd、Cu、Zn能力的影响,对1年生小黑杨(Populus simonii×P.nigra)扦插盆栽苗,分别人工施加一定量的Cd、Cu、Zn,待苗木生长30 d后,接种舞毒蛾(Lymantria dispar)幼虫,取食14 d取出,7 d后取样,分析小黑杨根、茎、叶的干质量、重金属质量分数、富集系数、转运系数、贮存量。结果发现:各处理间根(8.0%~19.7%)、茎(61.0%~69.7%)、叶(17.3%~26.1%)干质量占植株的比例较为一致,不受重金属胁迫或重金属+昆虫取食胁迫影响。在Cd胁迫或Cd+昆虫取食胁迫下,小黑杨各部位对Cd的富集量及贮存量未产生显著响应。在Cu、Zn胁迫下,小黑杨根茎叶对Cu、Zn的富集量极显著增加(P<0.01)、贮存量显著增加(P<0.05);在Cu、Zn胁迫叠加昆虫取食胁迫后,对Cu、Zn的富集量及贮存量显著降低(P<0.05),但其在小黑杨各部位的分布状况不变。Cd在小黑杨各部位的富集量比较相近,Cu主要在茎部,Zn主要在叶部。Cd、Cu在茎部贮存量最高,达总贮存量的50%以上,而Zn量主要贮存在茎、叶部,达总贮存量的80%以上。各处理组的转运系数(TF)由大到小为Zn、Cd、Cu,Zn胁迫降低了小黑杨的TF,Cd、Cu胁迫增加了小黑杨的TF;昆虫胁迫增加了小黑杨对Cd和Zn的TF,降低了对Cu的TF。说明昆虫取食能显著影响杨树对重金属的富集能力。
译  名：
Effects of Insect Herbivory on Cd,Cu and Zn Accumulation in Populus simonii×P. nigra
作  者：
Song Lei;Wang Yueyue;Gao Lulu;Jiang Dun;Hou Chao;Yan Shanchun;Northeast Forestry University;
关键词：
Populus simonii× P;;nigra;;Heavy metal stress;;Insect herbivory
摘  要：
For exploring the effects of insect herbivory on Cd,Cu and Zn accumulation in the poplar( Populus simonii×P. nigra)trees,we tested the one-year-old poplar potted cutting seedlings with various concentrations of heavy metal exposures. After30-d heavy metal treatments,the gypsy moth( Lymantria dispa) larvae were added to the seedlings,and allowed to feed on the foliages for consecutive 14 d before removal from the tested seedlings. The dry weights,heavy metal concentraions,bioconcentration factors( BCF),translocation factors( TF) and storage capacities of the potted cutting seedlings were sampled and analyzed for 7 d after the larval removal. The dry weight percentages of roots( 8%-19.7%),stems( 61.0%-69.6%) and leaves( 17.3%-26.1%) were relatively consistent among the treatments,and they were not affected by heavy metal stress or by insect herbivory. Cd stress alone,or Cd plus insect herbivory did not show significant effects on the bio-concentration factors( BCF) and Cd storage capacities of the seedlings. Under the stress of Cu and Zn,accumulations of Cu and Zn in the seedling roots,stems and leaves were increased significantly( P < 0. 01),so did their storage capacities( P < 0. 05).However,insect herbivory by the gypsy moth larvae on the Cu or Zn stressed seedlings significantly decreased the accumulation and storage capacity of Cu and Zn( P<0.05) in all seedling parts. The amounts of Cd accumulation was similar among roots,stems and leaves of the popar seedlings. Cu was mainly concentrated in the stems,while Zn was mostly accumulated in the leaves. The storage capacities of Cu and Cd in the stems were the highest,exceeding 50% of the total storage capacity. The storage capacity of Zn was highest in the stems and leaves,accouting for above 80% of the total storage.The descending order of transfer factor( TF) in metal treatment groups was Zn,Cd and Cu. The Zn stress reduced the TF of the potted cutting seedlings,whereas,the stress of Cd or Cu increased the TF. Insect herbivory by the gypsy moth larvae increased the TF of Cd and Zn,but reduced the TF of Cu. Thus,the accumulation of heavy metal by the poplar seedlings was significantly affected by insect herbivory.

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