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Establishment of water environmental purification system basing on resource cycle with forage rice

基于饲料稻资源循环的水环境净化系统的建立

基本信息

批准号：
17560484
负责人：
HOSOMI Masaaki
金额：
$ 2.18万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In the laboratory experiment, the nitrogen removal efficiencies and the biomass production were compared between surface flow (SF) and vertical flow (VF) system. It is found that the nitrogen removal efficiencies in the VF systems were higher than those in SF systems both irrigated by synthetic river water and livestock wastewater. In addition, the nitrogen efficiencies planted with forage rice were higher than those without plant. The above-ground biomass of forage rice under the condition of VF irrigated by livestock wastewater was the highest, achieved 3.0 kg dry weight m^<-2>. The nitrogen contents assimilated by above-ground biomass were about 80% of the entirely nitrogen content under VF systems and 90% under SF system.On the other hand, compared with the concentrations of Estrone(E1) (10μg/L) and 17β-Estradiol(E2) (6.4μg/L) in the influent, those in the effluent were lower than 2.0μg/L, suggesting that 80% and 69% of these two kinds of Endocrine-disrupting compound were removed by VF systems with forage rice.We investigated nitrogen removal performance and behavior in the field planted with forage rice and irrigated by nutrient polluted river water. The average nitrogen removal rate was 175 mg m^<-2> d^<-1>. Most of the nitrogen taken up by rice plants was contained in the aboveground biomass, with the mean amount being 34 g N m^<-2>. Since forage rice containing nitrogen could be supplied to livestock industry through Whole-Crop Silage, The results indicate wetland system using forage rice are useful in reduction of nitrogen loading to the environment as well as increase of feed self-sufficiency rate in Japan.

在实验室试验中，比较了表面流(SF)和垂直流(VF)系统的脱氮效果和生物量。结果表明，无论是人工河水灌溉还是畜禽废水灌溉，VF系统的脱氮效率均高于SF系统。此外，种植饲用水稻的氮素效率也高于不种植的。在畜禽废水灌溉的变压条件下，饲用水稻的地上生物量最高，达到3.0 kg干重。同时，与进水中雌酮(E_1)(10μg/L)和17-雌二醇(E_2)(6.4μg/L)浓度相比，出水中雌酮(E_1)和17-雌二醇(E_2)(6.4μg/L)的浓度均低于2.0μg/L，说明采用饲草稻田和营养污染河水灌溉系统可以去除80%和69%的这两种内分泌干扰物质。平均脱氮率为175mgm^~(-2)~(-1)。水稻植株吸收的氮素主要存在于地上生物量中，平均为34gN。由于含氮饲草大米可以通过全作物青贮料提供给畜牧业，结果表明，在日本，利用饲草大米的湿地系统有助于减少对环境的氮素负荷，提高饲料自给率。