摘要
采用盆栽方法,研究了4种北方阔叶树种茶条槭、山梨、五角槭和山荆子一年生苗木对土壤镉胁迫的生长反应和抗性.采用土壤和风化砂混合物作为栽培基质,设计5种土壤镉浓度梯度处理(对照、10、5 0、10 0、2 0 0mg·kg-1) .结果表明,低浓度处理(≤5 0mg·kg-1)刺激各树种苗木的地径、树高生长,其中茶条槭在10mg·kg-1处理下地径和苗高增加幅度最大,分别为对照的135. 8%和14 6 . 0 % ;随着镉处理浓度的增加,地上部生长量下降,茶条槭在最高浓度处理下,生长量降低最大,地径和苗高仅分别为对照的2 4 1%和2 8 0 % .叶片和新枝生物量变化存在较大种间差异,茶条槭和山梨在低浓度处理时总体上表现增加;山荆子新枝生物量增加,叶生物量减少;五角槭表现一致减少.最高浓度处理时,叶和新枝生物量受影响最大的是茶条槭,分别为对照的4 . 6 %和7. 3% ;其次为五角槭,分别为对照的5 . 7%和7. 9% ;山梨和山荆子受影响的幅度相对较小.新根生物量除山梨外,其它3个树种苗木的生物量表现一致下降,其中下降幅度以茶条槭最大,最高浓度处理仅为对照的2 . 3% .山梨在低浓度处理下,新根生物量有所增加,分别为对照的12 5 . 5 %和117. 1% .茶条槭和山梨的苗木在低浓度处理下,总生物量增加幅度提高;高浓度处理时。
In this paper,the gradient (0,10,50,100,200 mg·kg~ -1) of soil Cd concentrations was established by mixing CdCl_2 with soil and sand,and the growth responses of four northern broadleaved tree species Acer ginnala Pyrus ussuriensis,Acer mono and Malus baccata to soil Cd contamination were studied by growing their seedlings in pots in greenhouse.The results revealed that the seedling growth of all test species was enhanced under lower soil Cd concentrations (≤50 mg·kg~ -1),and Acer ginnala had the strongest response under 10 mg·kg~ -1 treatment,with 135.8% and 146.0% increment of collar and height growth,respectively,in comparing with the control.But,the growth of aboveground part decreased with increasing soil Cd,and the collar and height growth of A.ginnala under the highest Cd concentration was only 24.1% and 28.0% of the control,respectively.Under lower Cd concentrations,an increase of foliage and new shoot growth was found in A.ginnala and P.ussuriensis,the biomass of new shoots increased but that of foliage decreased in M.baccata,and both foliage and new shoot decreased in A.mono.Under the highest Cd concentration,A.ginnala had the greatest decrease of foliage and new shoot biomass,being 4.6% and 7.3% of the control,respectively,while P.ussuriensis and M.baccata had a relatively less decrease.The biomass increase of new roots declined with increasing Cd concentration for all tree species except P.ussuriensis,and the least increase was A.ginnala,only 2.3% of the control.The new root biomass of P.ussuriensis was 125.5% and 117.1% of the control at 10 mg and 20 mg·kg~ -1,respectively.The total biomass increment of A.ginnala and P.ussuriensis seedlings was greater than that of the control under lower Cd concentrations,while an obvious decrease was found for all tree species under higher Cd concentrations.Under the highest Cd concentration,the total biomass of A.ginnala,M.baccata,A.mono and P.ussuriensis was 13.7%,27.2%,36.4 and 40.1% of the control,respectively.Subordinate function analysis suggested that the tolerance of test tree species to soil Cd contamination was in order of M.baccata > A.ginnala > P.ussuriensis > A.mono.Analysis of Cd concentration in plant tissues demonstrated that P.ussuriensis had the highest Cd enrichment coefficient for its root,shoot and foliage,and M.baccata also had a higher Cd enrichment in its root and shoot.
出处
《应用生态学报》
CAS
CSCD
北大核心
2005年第4期655-659,共5页
Chinese Journal of Applied Ecology
基金
黑龙江省科技计划项目 (GCO1KBKB2 13 )
国家自然科学基金资助项目 (3 0 3 7114 9)
关键词
茶条槭
山梨
五角槭
山荆子
土壤镉污染
生长反应
抗性
Acer ginnala, Pyrus ussuriensis, Acer mono, Malus baccata, Soil Cd contamination, Growth response, Tolerance
