【摘要】 采用小区试验方法,研究了不同水力负荷条件下薄荷(Mentha arvensis)对鱼塘养殖循环水氮、磷的吸收能力和去除作用。结果表明,当水力负荷为0.35～1.40 m~3/(m~2·d)时,薄荷的生物量累积增加1.40～1.95 kg/m~2,产量为11 098～15 177 kg/hm~2;在水力负荷0.35 m~3/(m~2·d)时,薄荷组织中氮含量表现为地上部>地下部,根冠比(地上部/地下部)为1.05;而磷含量在4种水力负荷下均表现为地上部<地下部,随水力负荷的增大,根冠比分别为0.93、0.86、0.69、0.71。整株的氮、磷平均含量在4种水力负荷下分别在14.43～17.23和3.09～3.35 mg/g;薄荷对氮、磷的吸收总量在水力负荷1.05 m~3/(m~2·d)时均达到最大,分别为36.20和7.53kg/hm~2;在水力负荷0.35 m~3/(m~2·d)时,薄荷吸收作用对系统去除水体氮、磷的贡献率达最大,分别为15.95%和22.12%。更多还原

【Abstract】 The nitrogen and phosphorus uptake and removal abilities of Mentha arvensis eutrophic water under different hydraulic loadings, were comparatively studied by simulation experiments. The results showed that when hydraulic loading was 0.35～1.40 m~3/(m~2·d), the total biomass of Mentha arvensis was increased by 1.40～1.95 kg/m~2, Yield was 11 098～15 177 kg/hm~2.The nitrogen distributions in Mentha arvensis were shown as above ground>below ground when hydraulic loading was 0.35 m~3/(m~2·d), the(above ground/below ground) ratio was 1.05. the phosphorous distributions were shown as above ground<below ground when hydraulic loading was 0.35～1.40 m~3/(m~2·d), the(above ground/below ground) ratio was 0.93、0.86、0.69、0.71 with the increase of hydraulic loading, respectively.The nitrogen and phosphorous contents of Mentha arvensis were 14.43～17.23 and 3.09～3.35 mg/g, respectively. The total uptakes of nitrogen and phosphorus by Mentha arvensis reached the maximum when the hydraulic loading was 1.05 m~3/(m~2·d), 36.20 and 7.53 kg/hm~2, respectively. When the hydraulic loading was 0.35 m~3/(m~2·d),the apparent contribution rates of nitrogen and phosphorous reached the maximum,15.91% and 22.34%, respectively.更多还原