水葫芦对滇池底泥氮磷营养盐释放的影响  

Effects of water hyacinth(Eichhornia crassipes) on release of nitrogen and phosphorus from sediment of Lake Dianchi

作　　者：王智[1,2] 王岩[1] 张志勇[1] 张君倩[1] 严少华[1] 张迎颖[1] 刘海琴[1] 

机构地区：[1]江苏省农业科学院农业资源与环境研究所,南京210014 [2]中国科学院测量与地球物理研究所环境与灾害监测评估湖北省重点实验室,武汉430077

出　　处：《环境工程学报》2012年第12期4339-4344,共6页Chinese Journal of Environmental Engineering

基　　金："十二五"滇池水专项(2012ZX07102-004-6);国家科技支撑计划项目(2009BAC63B01);云南省社会发展专项(2009CA034);江苏省人社厅博士后基金(5311105)

摘　　要：为了探讨水葫芦对富营养湖泊底泥氮磷营养盐释放的影响,通过原位采集滇池柱状底泥,以蒸馏水为上覆水,进行了25 d的室内静态模拟实验。实验比较了水葫芦处理组和空白对照组底泥氨氮(NH4+-N)、硝态氮(NO3--N)、溶解性总氮(DTN)、正磷酸盐(PO34--P)等的释放特征。结果表明,与对照组相比,水葫芦处理组上覆水溶解氧、pH显著性降低,而PO34--P浓度显著性升高;在实验前2 d,水葫芦处理组上覆水NH4+-N和DTN浓度显著性高于对照组,而在5～25 d时,其显著性低于对照组。根据上覆水营养盐浓度、水葫芦植株吸收营养盐总量,推算底泥氮磷营养盐释放的平均速率,表明水葫芦加速了滇池底泥氮、磷营养盐的释放速率,处理组氮、磷释放速率分别为对照组的5.3～170.2和1.5～21.6倍。To evaluate the effects of water hyacinth （Eichhornia crassipes） on release of nitrogen and phos- phorus from sediment, a 25-day laboratory experiment was carried out. The sediment was taken from Lake Dian- chi and was covered by water with water hyacinth as treatments and by water only as controls. Released nutrients such as ammonia, nitrate and dissolved total nitrogen, orthophosphate from the sediment were compared between treatments and controls. Results showed that dissolved oxygen and pH significantly decreased and orthophosphate significantly increased in treatments compared to controls （P 〈 0.05）. During the first two days of the experi- ment, ammonia and dissolved total nitrogen in treatments were significantly （P 〈 0.05） higher than in controls. However, from the fifth day forward, the results were inversed. The average release rates of nitrogen and phos- phorus were calculated based on the concentrations of nitrogen and phosphorus in overlying water and total con- tents of nitrogen and phosphorus absorbed by water hyacinth. The results showed that water hyacinth accelerated the release rates of nitrogen and phosphorus from the sediment. The release rates of nitrogen and phosphorus re- leased were 5.3 - 170.2 and 1.5 - 21.6 times higher in treatments than in controls respectively.

关 键 词：水葫芦 营养盐 沉积物 释放 滇池 

分 类 号：X524[环境科学与工程—环境工程]