不同规格根际调控基质块对玉米生长及Cd吸收的影响  

Effects of Different Specification Rhizosphere Regulation Medium Blocks on Corn Growth and Cd Uptake

作　　者：陈曦[1,2] 左强[1] 邹国元[1] 张琳[1] 谷佳林[1] 宫延刚[1] 王甲辰[1] 

机构地区：[1]北京市农林科学院植物营养与资源研究所,北京100097 [2]内蒙古师范大学民族艺术学院,呼和浩特011517

出　　处：《农业环境科学学报》2013年第9期1745-1751,共7页Journal of Agro-Environment Science

基　　金：公益性行业(农业)科研专项(20100314);国家科技支撑课题"农田有害物质循环阻控与消减关键技术研究"(2007BAD89B03);科技部科技人员服务企业项目(2009GJA00026)

摘　　要：污染土壤修复一直是科学家高度关注的问题。目前通常采用的是物理、化学和生物修复方法，但上述方法都有一定局限。为了探索新的方法技术，为根际调控修复污染农田提供技术和实践依据，采用4种不同规格基质块（直径X厚度分别为50mmx20mm、35mmx20mm、50mmx25mm、65mm20mm，质量分别为40．0、19．6、50．0、67．6g）与含5．19mg·k—cd的土壤组合成5个处理的盆栽试验，探索不同规格根际调控基质块对玉米生长及cd吸收的影响，进行基质块根际调控阻抗重金属研究尝试。结果表明，体积和质量最大基质块处理5比其他处理显著促进了玉米地上部生长，同时，该处理的总根系干重、块内和块外根系干重也显著高于其他处理。与不用基质块的处理1（cK）相比，应用基质块的玉米地上部cd含量降低了11．5％～46．3％、根系降低了1．19％．56．0％，只有处理5的玉米地上部cd含量显著下降。试验结果还表明，根际调控需要适当调节空间，验证了本科研组提出的重金属根际调榨拮术的可行性以及实际应用的可操作性。Contaminated soil remediation is always a highly concerned problem. Generally, the present remediation methods are physical, chemical, and biological, but there are some confined factors for these methods above, so exploring new methods or techniques seems very important. The aim was to research the effects of different specification rhizosphere regulation medium blocks on corn growth and Cd up- take, and conduct the attempt of using medium block rhizosphere regulation to resist heavy metals to provide technological and practical ref- erences for development of rhizosphere regulation for farmland of heavy metal polluted. In this test, a pot experiment was conducted with 5 treatments of 4 medium block specifications（Diameter x thicknesses were 50 mmx20 mm, 35 minx20 mm, 50 mmx25 mm and 65 mmx20 mm respectively and weights were 40.0 g, 19.6 g, 50.0 g and 67.6 g, respectively） and 1 washing out medium block when corn seedlings were transplanted in the 5.19 mg-kg-1 of Cd in soil. The results showed that comparing with other treatments, treatment 5 improved corn shoot growth significantly. The total root dry weights, root dry weights in the inner and outside medium block of treatment 5 were also obvi- ously higher than those of treatments 1~4. Compared with treatment 1 （CK）, the Cd contents in shoots and roots were decreased from 11.5% to 46.3% and from 1.19% to 56.0% in the all treatments, respectively, with significant decrease in shoot only in treatment 5. The experiment results also showed that rhizosphere regulation needs suitable regulative space. This current research has verified the technological practica- bility of heavy metal rhizosphere regulation established by our previous work and practical application maneuverability.

关 键 词：根际调控 不同规格 基质块 玉米 CD 

分 类 号：X53[环境科学与工程—环境工程]