铅污染对茶条槭和五角槭光合作用和叶绿素荧光特性的影响  

Influence of Pb pollution on photosynthesis and chlorophyll fluorescence characteristics in Acer ginnala and Acer mono

作　　者：李亚藏[1] 梁彦兰[1] 王庆成[2] 

机构地区：[1]安阳工学院土木与建筑工程学院,河南安阳455000 [2]东北林业大学林学院,黑龙江哈尔滨l50040

出　　处：《湖南农业大学学报（自然科学版）》2012年第2期168-172,共5页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：国家自然科学基金项目(30371149);黑龙江省科技计划项目(GCO1KBKB213)

摘　　要：以北方阔叶树种茶条槭(Acer ginnala)和五角槭(Acer mono)1年生苗木为材料,采用土壤和风化砂混合物作为盆栽基质,设置0(CK)、100、500、1 000、2 000 mg/kg 5种土壤Pb2+质量浓度,研究土壤铅污染对苗木叶片光合作用和叶绿素荧光特性的影响。结果表明:总体趋势上,随着土壤Pb2+质量浓度的增加,茶条槭的光合速率(Pn)逐渐下降,蒸腾速率(Tr)、气孔导度(Gs)和胞间CO2浓度(Ci)先升后降;五角槭的光合速率先升后降,蒸腾速率和气孔导度逐渐下降,胞间CO2浓度逐渐升高;随着土壤Pb2+质量浓度的增加,两树种的原初光能转换效率(Fv/Fm)和PSⅡ的潜在活性(Fv/Fo)先升后降,光化学猝灭系数(qP)和光化学量子效率(ΦPSII)逐渐下降,非光化学猝灭系数(qN)茶条槭表现为先升后降;在土壤Pb2+质量浓度大于500 mg/kg时,茶条槭光合速率的下降是气孔限制和非气孔限制二者共同作用的结果,五角槭光合速率的下降主要由非气孔限制因素所致;两树种各叶绿素荧光参数与光合速率均无显著相关;在土壤Pb2+质量浓度低于1 000 mg/kg时,铅污染对两树种生长的影响不显著,两树种均可作为目前城市中铅污染区域的绿化树种。Using soil and weathered sand as matrix,two northern broadleaved annual seedlings Acer ginnala and Acer mono were potted to study the influence of soil Pb pollution on photosynthesis and chlorophyll fluorescence characteristics in leaves of seedlings by designing 5 kinds of Pb2＋ concentration（0,100,500,1 000,2 000 mg/kg）.The result showed with increasing concentration of soil Pb2＋,for Acer ginnala,Pn declined continuously and Tr,Gs and Ci first increased and then decreased and for Acer mono,Pn first increased and then decreased,Tr and Gs declined continuously and Ci increased continuously.With increasing Pb2＋ concentrations in soil,Fv/Fm and Fv/Fo first increased and then decreased,qP and ФPSⅡ declined continuously for two trees,qN first increased and then decreased for Acer ginnala.In Pb2＋ concentrations greater than 500 mg/kg,stomatal and non-stomatal limitations together caused Pn declining for Acer ginnala and non-stomatal limitation caused Pn declining for Acer mono;the chlorophyll fluorescence parameters were not significantly related to photosynthetic rate for two trees and in Pb2＋ concentrations less than 1 000 mg/kg,growth of two trees was not significantly effected.So the two trees could be applied to the present city with Pb pollution for green area construction.

关 键 词：茶条槭 五角槭 铅污染 光合作用 叶绿素荧光特性 

分 类 号：S792.35[农业科学—林木遗传育种]