光照强度对三峡库区消落区土壤-水界面可溶性硅和无机氮释放的影响  

Influence of Light Intensity on the Release of Dissolved Silicon and Inorganic Nitrogen from Soils at the Water Fluctuation Zone in the Three Gorges Reservoir Area

作　　者：张蕾[1] 王刚[1] 夏伟[1] 于航[1] 赵秀兰[1,2] 

机构地区：[1]西南大学,资源环境学院,三峡库区生态环境教育部重点实验室,重庆400715 [2]重庆市农业资源与环境重点实验室,重庆400716

出　　处：《西南大学学报（自然科学版）》2012年第5期85-90,共6页Journal of Southwest University(Natural Science Edition)

基　　金：第三届国家大学生创新性实验计划项目(091063517)

摘　　要：通过模拟淹水试验,研究了三峡库区消落区土壤(石灰性紫色土、沉积物、水稻土)可溶性硅和无机氮的释放规律及光照强度的影响.结果表明:光照能加速底栖微生物对NH4+-N的硝化以及摄取,从而使NH4+-N的消耗量增大,含量降低,从而使NO3--N浓度增大,含量升高.光照能刺激上覆水中硅藻的光合作用,加速其生长,使硅藻直接摄取更多的可溶性硅,从而使水体中可溶硅浓度下降.The influence of light intensity on the release of dissolved silicon and inorganic nitrogen from soils, including a calcareous purple soil, a sediment soil and a paddy soil, in the water fluctuation zone of the Three Gorges Reservoir was investigated by a simulated flooding experiment. The result showed that increasing light intensity could enhance the uptake and nitrification of NH＋-N by benthic microbes, consequently increasing the consumption of NH＋-N and decreasing NH4＋-N concentration, but increasing NO3-N concentration in the overlying water. The increase in light intensity could also promote the photosynthe-sis of diatoms and stimulate their growth, make them directly consume more soluble silica, and decrease the soluble silicon concentration in the overlying water.

关 键 词：三峡库区 消落区 光照强度 可溶性硅 无机氮 

分 类 号：X522[环境科学与工程—环境工程]