| 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. |
| 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 mineral nutrients concentration |
| 投稿时间：2017-10-06 |
| DOI：10.11654/jaes.2017-1350 |
| 中文关键词: 日光温室 镉污染 生菜 镉吸收规律 矿质元素 |
| 英文关键词: greenhouse Cd pollution lettuce Cd uptake characteristic mineral nutrients |
| 基金项目:公益性行业（农业）科研专项（201203045）；河北环境工程学院博士启动基金项目（B201406） |
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| 摘要点击次数: 1997 |
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| 中文摘要: |
| 为探究镉污染条件下日光温室生菜在整个生育期内对镉的吸收规律及其与矿质元素吸收的关系，采取田间试验的方法，以立生二号生菜作为供试材料，种植在镉污染（Cd浓度1.87 mg·kg-1）日光温室内。在整个生育期不间断采样，测定生菜地上部Cd及Fe、Mn、Cu、Zn、Ca、Mg含量。结果表明，生菜地上部Cd浓度在苗期从2.70 mg·kg-1增加到3.62 mg·kg-1，器官形成期从3.62 mg·kg-1降低到2.40 mg·kg-1，抽薹期从2.40 mg·kg-1降低到1.64 mg·kg-1。单株生菜地上部Cd累积的速率可以用"S"型曲线方程进行描述（R2=0.99）。苗期、器官形成期和抽薹期Cd累积速率分别为0.098、0.516、0.056 μg·株-1·d-1。Cd与Fe、Mn、Cu、Zn、Ca、Mg浓度相关系数在整个生长阶段生菜分别为-0.77、-0.31、-0.06、0.09、0.46、-0.10，在营养生长阶段分别为-0.43、0.25、-0.06、0.16、0.56、0.41，在生殖生长阶段分别为-0.82、-0.26、0.72、0.93、0.42、0。可以得出如下结论：生菜地上部Cd浓度的变化与地上部生物量的变化高度相关，Cd浓度在苗期增加，在器官形成期和抽薹期降低。约15%的Cd累积发生在苗期，约80%的Cd累积发生在器官形成期，约5%的Cd累积发生在抽薹期。整个生长阶段生菜地上部Cd浓度和Fe浓度变化呈极显著负相关，和Ca呈显著正相关；在营养生长阶段，生菜地上部Cd浓度和Ca浓度变化呈显著正相关；在生殖生长阶段生菜地上部Cd浓度变化和Fe显著负相关，和Zn、Ca显著正相关。 |
| 英文摘要: |
| 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-1 during organogenesis and from 2.40 to 1.64 mg·kg-1 during 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 accumulate 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 aboveground 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 concentration of Cd content in lettuce was negative related to the concentration of Fe(r=-0.77, P<0.01), significantly positive with the concentration 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 positive with Zn concentration(r=0.93, P<0.01). |
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