摘要
探讨了"猪-沼液-牧草"模式中兼顾生物量生产与防止土壤和地下水污染的沼液适用量。田间试验在15个、面积分别为9m2的小区上进行,试验设1个对照,1个无机肥处理和3个沼液处理;每个季节杂交狼尾草施肥生长28d后收获测定生物量与土壤养分变化。结果表明,在厦门除冬季不适合种植杂交狼尾草外,春、夏、秋季节施用沼液种植杂交狼尾草均能获得较好生长;在沼液施用量0～400L·9m^(-2)·2周-1范围内,杂交狼尾草生物量随沼液施用量增加呈上升趋势,最大沼液施用量组(400L·9m^(-2)·2周-1)杂交狼尾草生物量春夏秋冬依次为26.03、19.97、11.70、3.41kg·区-1;至全年试验结束,在上述沼液施用强度内(最大400L·9m^(-2)·2周-1),土壤TN、TP、NH+4-N呈略有下降的趋势,土壤硝态氮略有上升,一年之内未见对土壤养分含量构成显著影响。与使用化肥比较,使用沼液因N引起的环境和地下水硝酸盐污染风险小。针对单施沼液出现土壤养分含量下降问题,建议加大沼液施用量或者配施一定的无机肥。
A feasible slurry application was determined for both the maximum harvested biomass and friendly environment in ＂ swine-bio- gas-grass＇ system. 15 plots, 9 m^2 for each, were randomly arranged for field test, five treatments including one group of inorganic fertilizer, 3 levels of slurry and 1 ck were designed. The grass biomass and soil nutrients were determined after planting 28 d within each season. The results showed that the grass could grow well with application of pig slurry except in winter. Crossbred pennisetum growth was enhanced with increasing of slurry application within 0-400 L· 9 m^2· 2weeks^-1. Under the maximum application of slurry （400 L·9 m^-2·2weeks^-1）, harvested biomass of crossbred pennisetum in spring, summer, autumn and winter was 26.03, 19.97, 11.70 and 3.41 kg· 9 m^-2 respectively. In the end of the experiment, no significant difference of soil nutrients was found even in the treatment of 400 L slurry· 9 m^-2·2weeks^-1, although soil TN, TP and NH^＋4-N decreased and the nitrate increased slightly. Compared with inorganic fertilizer, application of pig slurry resulted in less environmental risk, indicated by lower nitrate residue in soil. Increasing slurry application or applying mixed fertilizer was suggested to meet the loss of soil nutrient.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第4期1527-1531,共5页
Journal of Agro-Environment Science
关键词
沼液
杂交狼尾草
生物量
土壤养分
slurry
crossbredpennisetum
biomass
soil nutrient
