植物修复过程中蜈蚣草对土壤养分的吸收动态:5年田间定位试验  

Accumulation of N,P and K in Pteris vittata L. during phytoremediation:A five-year field study

作　　者：陈同斌[1] 李海翔[2] 雷梅[1] 武斌[1] 宋波[1,2] 张学洪[2] 

机构地区：[1]中国科学院地理科学与资源研究所环境修复中心,北京100101 [2]桂林理工大学环境科学与工程学院,桂林541004

出　　处：《环境科学学报》2010年第2期402-408,共7页Acta Scientiae Circumstantiae

基　　金：国家高技术研究发展计划(No.2007AA061001);国家科技支撑项目(No.2006BAD17B04)~~

摘　　要：鉴于砷超富集植物蜈蚣草已被成功地用于修复砷污染土壤,本研究通过连续5年的植物修复田间试验,研究了土壤氮、磷、钾的消减动态和蜈蚣草对土壤氮、磷和钾的吸收动态.结果表明:种植蜈蚣草可使土壤全氮含量降低约25%(2100～2700mg.kg-1),土壤全磷和全钾含量的年际变化不明显;蜈蚣草地上部氮、磷和钾含量分别为1.23～2.38、0.14～0.47和1.10～2.01g.kg-1,地上部带走的总氮、总磷和总钾量分别为23～89、4.4～13.0和21～69kg.hm-2.a-1;与水稻和小麦相比,蜈蚣草对氮、磷和钾的吸收量都较低,但如果在连续种植过程中不施肥,蜈蚣草则可能会出现养分亏缺问题.The As-hyperaccumulator Pteris vittata L.has been applied for phytoremediation of As-contaminated soil in field projects.In order to improve the removal efficiency,a five-year field trial was conducted to study the dynamics of N,P and K contents of soils and the accumulation of these elements in P.vittata during phytoremediation.The results showed that the total N contents of soils in 3 plots with different levels of arsenic decreased significantly （25%） while the total P or K contents of soils in the 3 plots did not decrease obviously by the end of five-years of remediation.The total N,P and K contents in shoots of P.vittata were 1.23～2.38,0.14～0.47 and 1.10～2.01 g·kg^-1,respectively.The annual accumulation of N,P and K in P.vittata were 23～89,4.4～13.0 and 21～69 kg.hm^-2.a^-1,respectively.The total quantities of all nutrients accumulated by P.vittata from soils were less than that of rice and wheat,so nutrient deficiency might be a problem for growth of P.vittata without fertilizer during continuous remediation.

关 键 词：吸收动态 土壤养分 蜈蚣草 植物修复 砷污染土壤 

分 类 号：X53[环境科学与工程—环境工程]