农业环境科学学报2018，Vol.37Issue(5)：860-867,8.DOI:10.11654/jaes.2017-1350
生菜地上部镉累积规律及其与矿质元素浓度的关系
Cadmium accumulation in above-ground parts of lettuce(Lactuca sativa L.)and its relationship between min-eral nutrients concentration
摘要
Abstract
To explore the characteristic of Cd concentrations and accumulation in above-ground parts of lettuce and its interactions with mineral nutrients uptake,a field study was conducted in a Cd-contaminated greenhouse.Lettuce named"Lisheng,erhao"was cultivated and the above-ground parts were sampled during the whole growth stage and the Cd and Fe,Mn,Cu,Zn,Ca,Mg content in lettuce aboveground parts were measured.The results showed that the Cd concentration in the above-ground parts of lettuce increased from 2.70 to 3.62 mg·kg-1 during the seedling stage,but decreased from 3.62 to 2.40 mg·kg-1during organogenesis and from 2.40 to 1.64 mg·kg-1during bolting.The Cd accumulation in the above-ground parts of an individual lettuce plant could be described by a sigmoidal curve(R2=0.99).The Cd accu-mulate rate for seedling stage,organogenesis and bolting were 0.098,0.516,0.056 μg·plant-1·d-1.During the whole stage,the r value of Cd with Fe,Mn,Cu,Zn,Ca,Mg were-0.77,-0.31,-0.06,0.09,0.46,-0.10 respectively.During the vegetative stage(seedling+organogenesis stage)the r value of Cd with Fe,Mn,Cu,Zn,Ca,Mg were-0.43,0.25,-0.06,0.16,0.56,0.41 respectively.During reproductive stage,the r value of Cd with Fe, Mn,Cu,Zn,Ca, Mg were -0.82,-0.26, 0.72, 0.93, 0.42, 0. The conclusion were:The Cd content in lettuce above-ground parts was highly related to growth,the Cd content was increasing during seedling while decreasing during organogenesis and bolting. Cadmium uptake during seedling was 15%,during organogenesis was 80%,during bolting was 4.35%.During the whole stage,the concen-tration of Cd content in lettuce was negative related to the concentration of Fe(r=-0.77,P＜0.01),significantly positive with the concentra-tion of Ca(r=0.46,P＜0.05).During vegetative stage,Cd concentration in lettuce was significant positive related to Ca(r=0.56, P＞0.05). During reproductive stage,Cd concentration showed significant negative to Fe concentration(r=-0.82,P＜0.05)while it was significant pos-itive with Zn concentration(r=0.93,P＜0.01).关键词
日光温室/镉污染/生菜/镉吸收规律/矿质元素Key words
greenhouse/Cd pollution/lettuce/Cd uptake characteristic/mineral nutrients分类
农业科技引用本文复制引用
唐希望,吉普辉,同延安,伊丽丽..生菜地上部镉累积规律及其与矿质元素浓度的关系[J].农业环境科学学报,2018,37(5):860-867,8.基金项目
公益性行业(农业)科研专项(201203045) （农业）
河北环境工程学院博士启动基金项目(B201406).Special Scientific Research Fund of Agricultural Public Welfare Profession of China(201203045) （B201406）
Doctoral Starting Foundation of Hebei University of Environmental Engineering(B201406) （B201406）
