| 茶树对铬、镉的吸收积累特性研究 |
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| 引用本文： | 唐茜,叶善蓉,陈能武,张苏敏,谭和平.茶树对铬、镉的吸收积累特性研究[J].茶叶科学,2008,28(5). |
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| 作者姓名： | 唐茜 叶善蓉 陈能武 张苏敏 谭和平 |
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| 作者单位： | 1. 四川农业大学林学园艺学院,四川,雅安,625014
2. 中国测试技术研究院,四川,成都,610021 |
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| 摘 要： | 通过水培实验,研究了茶树(3个品种)受铬(Cr3+)、镉(Cd2+)毒害的表观症状以及铬、镉在茶树体内的分布、积累特性。结果表明:铬(20~100mg/L)、镉(1~5mg/L)胁迫下,茶树出现的毒害症状和对新梢生长的抑制效应因胁迫浓度、时间和品种而异。茶树各器官的铬、镉含量总体随铬、镉胁迫浓度的增加而增加,并且与胁迫浓度呈极显著或显著正相关。铬在茶树体内由高到低的分布次序是:吸收根>主根>主茎>枝条>老叶>新梢(一芽二叶);镉则为:吸收根>主根>主茎>新梢(一芽二叶)>枝条>老叶。根部吸收的铬、镉元素大部分被吸收根所固定,向地上部运输的比例较低,但镉在茶树体内的活性和迁移能力强于铬,运输到地上部的镉极易迁移到新梢中。新梢不同叶位镉含量的高低顺序为:第一叶>第二叶>第三叶>第四叶,新梢中的镉有明显向上富集的趋势。不同品种的茶树对铬、镉的吸收、积累和迁移能力有一定差异。
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| 关 键 词： | 铬 镉 茶树 积累 毒害症状 |
Study on the Absorption and Accumulation of Cr3+ and Cd2+ in Tea Plants |
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| TANG Qian,YE Shan-rong,CHEN Neng-wu,ZHANG Su-ming,TAN He-ping.Study on the Absorption and Accumulation of Cr3+ and Cd2+ in Tea Plants[J].Journal of Tea Science,2008,28(5). |
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| Authors: | TANG Qian YE Shan-rong CHEN Neng-wu ZHANG Su-ming TAN He-ping |
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| Abstract: | The accumulation and distribution of Cr3 and Cd2 in hydroponic cultured different tea cultivars including Mingshan131, Mingshan213 and Fudingdabaicha and their toxic symptoms to these plants had been studied. The results indicated that the inhibitory effects and toxic symptoms of Cr3 and Cd2 on tea plants new shoots and new shoots of tea plants changed with different stress concentration, time and tea cultivars under Cr3 (20~100 mg/L), Cd2 (1~5 mg/L) stress. The concentrations of Cr and Cd in tea plants increased with the increasing of Cr3 and Cd2 stress or the prolonging of treated times. The total content of chromium and cadmium in all organs of tea plant was significantly positively correlated with the chromium, cadmium concentrations and the distribution order of Cr in the tea plants was: fine roots> main root> main stem> branches> old leaves>new shoots (one bud two leaves) while that of Cd was: fine roots> main root>main stem>new shoots (one bud two leaves)> branches> old leaves. Chromium and cadmium elements absorbed by roots were fixed in the fine root and the proportion of transport to upper was low, but the activity and transfer ability of cadmium in tea are stronger than that of chromium. Cadmium transported to the ground and could easily be migrated to new shoots. The order of Cadmium content in different leaf location of new shoots was: the bud> the second >the third >the fourth leaves. Cadmium had an obvious upward trend. The absorption, accumulation and migration ability of chromium and cadmium in tea plants changed with the different tea cultivars. |
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| Keywords: | chromium cadmium tea plant accumulation the toxic symptom |
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