Sedum alfredii: A New Lead Accumulating Ecotype
Sedum alfredii: A New Lead Accumulating Ecotype
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DOI：
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发表时间：
2002-11
影响因子：
11.4
通讯作者：
H. Bing;E. YangXiao;Ni Zhong;Weizheng Zhang;Long Xian;Ye Zheng Qian
中科院分区：
文献类型：
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作者：
H. Bing;E. YangXiao;Ni Zhong;Weizheng Zhang;Long Xian;Ye Zheng Qian
东南景天（Sedum alfredii Hance）是一种新的耐铅、富铅生态类型，分布于浙江省某铅锌矿区。通过水培试验，研究了不同浓度Pb（NO3）2对能积累和不能积累Pb的植物生态型的生长和Pb含量的影响。在320 mg/L以下的铅处理下，积累型小麦新梢生长不受影响，而非积累型小麦新梢生长在所有铅处理下均受到抑制。随着营养液中铅浓度的增加，积累型根和地上部中铅含量增加。铅积累型的地上部和地下部铅含量最高值分别为514 mg/kg和13922 mg/kg，是非铅积累型的2.27倍和2.62倍。铅积累型的最高积累速率为8.62 μg/株/d，是非积累型的7.16倍。由于其生长速度快、富集能力强，从植物修复的角度来看，富集型S.东南苜蓿是一种具有潜力的植物，可用于污染土壤中铅的去除。
In a survey of plant population, Sedum alfredii Hance, a new lead (Pb)_tolerant and lead (Pb)_accumulating ecotype , was found in an old Pb/Zn mining area in Zhejiang Province of China. The growth and Pb content of plant ecotypes being able to and unable to accumulate Pb were studied by hydroponic culture with different concentrations of Pb(NO 3) 2. Growth of shoots of accumulating ecotype was not affected by Pb treatments up to 320 mg/L, whereas that of non_accumulating ecotype was inhibited in all Pb treatments. The Pb concentrations in the roots and shoots of accumulating ecotype increased with increasing of Pb level in the nutrient solution. The maximum Pb concentrations in the shoots and roots of accumulating ecotype were 514 mg/kg and 13 922 mg/kg, 2.27 times and 2.62 times as much as that of non_accumulating ecotype, respectively. The highest rate of Pb accumulation of accumulating ecotype was 8.62 μg/plant/d, 7.16 times as much as that of non_accumulating ecotype. Due to its fast growth rate and high Pb_accumulating ability, from a phytoremediation perspective, accumulating ecotype of S. alfredii is a potential plant species for Pb removal from contaminated soils.