氮素形态与光强对苗期黄瓜吸收累积菲的影响研究  

Effect of nitrogen sources and light intensity on the absorption and accumulation of phenanthrene in cucumber seedlings

作　　者：郭玲玲[1] 周毅[1] 熊小丽[1] 代静玉[1] 沈其荣[1] 郭世伟[1] 

机构地区：[1]南京农业大学资源与环境科学学院

出　　处：《环境科学学报》2007年第10期1681-1687,共7页Acta Scientiae Circumstantiae

基　　金：国家重点基础研究发展计划(973计划)(No2005CB121101);国家自然科学基金(No30400279)~~

摘　　要：采用营养液培养的方法研究了不同形态氮素(NH4+-N、NO3--N)和光强对菲胁迫条件下黄瓜幼苗生长及光合特性的影响.结果表明:①与供NO3--N营养相比,供NH4+-N营养可同时增强黄瓜幼苗的抗菲胁迫及耐弱光的能力;②以NH4+-N为营养的黄瓜吸收的菲不仅运输至叶片的比例相对较低,而且运输至新生叶片的比例也相对较少,相对降低了新生叶中的菲累积,因而使得以NH4+-N为营养的黄瓜新生叶片维持了相对较大的光合面积和较高的光合速率.由此可见,与NO3--N营养相比,NH4+-N营养能改善黄瓜在菲胁迫环境中的生长状况,尤其在弱光条件下,这种现象更加明显.In a hydroponic experiment, the effects of nitrogen sources （ NH4^＋ -N, NO3^--N ） and light intensity on the growth and photosynthesis of cucumber seedlings （Jinchun 4, China） under phenanthrene stress were studied. Compared to NO3^--N, addition of NH4^＋-N enhanced the resistance of cucumber seedlings to phenanthrene and low light stress. Not only the proportion of phenanthrene in the leaves, but also the proportion of phenanthrene in the newly expanded leaves of the cucumber seedlings was significantly lower when they were supplied with NH^4 -N than with NO^- -N. Therefore a relatively higher rate of photosynthesis was maintained by cucumber seedlings under NH4^＋-N supply. In conclusion, compared to NO3^--N, NH4^＋-N improves the growth of cucumbers under phenanthrene stress, particularly at low light intensity.

关 键 词：氮素形态 光强 黄瓜 累积 菲 

分 类 号：X171.5[环境科学与工程—环境科学]