摘要
为了研究沼液灌溉对稻田水环境的影响,寻找安全的沼液施用量。本试验采用水稻盆栽试验,设置5个不同沼液灌溉量的处理,每个处理重复3次;在水稻生长期间共灌溉沼液9次,并在灌溉之后测定上覆水和下渗水的养分含量和重金属含量。试验研究发现,灌溉沼液期间稻田上覆水的养分含量均呈现先上升后下降的趋势,单季灌溉量为2250 mL.kg-1土的T4处理其养分含量明显高于对照处理,而各处理上覆水的重金属含量动态变化不明显;T4处理的稻田下渗水中养分含量在沼液灌溉后期急速上升,造成地下水环境富营养化的可能性增加。综合沼液灌溉对稻田上覆水和下渗水中养分和重金属含量的影响来看,沼液灌溉的安全施用量应控制在单季灌溉量为2250 mL.kg-1土的范围之内,使沼液灌溉对稻田水环境污染的可能性降低。
In order to study the influence of hiogas slurry application on paddy water environment, and look for a safe bio- gas slurry application method, a pot experiment was designed, setting five different amount of biogas slurry applying with 3 repeats. The slurry was irrigated for 9 times during the paddy growing period, nutrient and heavy metal contents in overlying water and seepage water were measured after each irrigation. It showed that the nutrient contents in overlying water firstly increased and then decreased. The nutrient contents for treatment T4 （2250 mL·kg-1 soil） were signitlcandy higher than the contrast. There were no significant different for the heavy metal contents for each treatment. In the later experiment pe- riod, the nutrient contents in seepage water of treatment 3-4 rose rapidly, which means increment of eutrophication peasibility for underground water. These results showed that the safe biogas slurry application should be controlled below 2250 mL·kg-1 soil each season, which can decrease the contamination pessibility for paddy water environment.
出处
《中国沼气》
北大核心
2013年第4期21-26,共6页
China Biogas
基金
国家"十一五"科技支撑计划项目(2010BAD03B03)
重庆市环保科技重点项目(CSTC2009AB7027)
关键词
沼液
稻田
水环境
营养物质
重金属
biogas slurry
paddy
water environment
nutrient
heavy metal
