Pb超富集植物金丝草（Pogonatherum crinitum）、柳叶箬（Lsache globosa）

重金属超富集植物是植物修复技术的核心和前提,但目前国内发现的Pb超富集植物较少,本研究通过野外调查和室内胁迫模拟实验相结合的方法,在国内首次发现并证实金丝草和柳叶箬为Pb的超富集植物。野外调查结果表明;金丝草地上部分Pb含量1 231.80 mg/kg,转运系数达到1.32,柳叶箬地上部分Pb含量1 818.40 mg/kg,转运系数6.5。室内模拟胁迫实验表明:在Pb胁迫浓度为5 000 mg/kg时金丝草和柳叶箬对Pb的转运系数均大于1,而且其地上部分Pb含量也超过1 000 mg/kg的水平。在Pb胁迫浓度为18 000 mg/kg时2种植物体内Pb含量达到最大值,金丝草地上部分和地下部分Pb含量分别达3 789.84 mg/kg和4 964.76 mg/kg,柳叶箬地上部分和地下部分Pb含量分别达3 411.56 mg/kg和1 523.02 mg/kg。

Two lead-hyperaccumulator: Pogonatherum crinitum and Lsache globosa

It is key step for phytoremediation to find heavy metal hyperaccumulator,however,a few lead-hyperaccumulators have been found in China.The plants grew in Youxi and Liancheng mining areas of Fujian Province were investigated and heavy metal concentrations in different organs of each plant were measured.Two new potential lead-hyperaccumulator of Pogonatherum crinitum and Lsache globosa were firstly found.The results showed that the Pb concentration in aboveground of Pogonatherum crinitum and Lsache globosa were 1 231.80 mg/kg and 1 818.40 mg/kg,their Pb transport coefficients were 1.32 and 6.5,respectively.The Pb concentration and transport coefficients were exceeded the standard of lead-hyperaccumulator.The Pb simulated experiment in soil pot showed that the Pb concentration in abovegruound of Pogonatherum crinitum and Lsache globosa were exceeded 1 000 mg/kg which was the critical standard of lead-hyperaccumulator,and the Pb transport coefficient exeeded 1 under Pb press of 5 000 mg/kg.The maximum Pb concentration in aboveground and roots of Pogonatherum crinitum and Lsache globosa were 3 789.84 mg/kg,4 964.76 mg/kg,and 3 411.56 mg/kg,1 523.02 mg/kg,respectively under Pb press of 18 000 mg/kg.