The estimation of non-point source pollution loads into the Danjiangkou Reservoir is highly significant to environmental protection in the watershed. In order to overcome the drawbacks of traditional watershed numeric...The estimation of non-point source pollution loads into the Danjiangkou Reservoir is highly significant to environmental protection in the watershed. In order to overcome the drawbacks of traditional watershed numerical models, a base flow separation method was established coupled with a digital filtering method and a flux method. The digital filtering method has been used to separate the base flows of the Hanjiang,Tianhe, Duhe, Danjiang, Laoguan, and Qihe rivers. Based on daily discharge, base flow, and pollutant concentration data, the flux method was used to calculate the point source pollution load and non-point source pollution load. The results show that:(1) In the year 2013, the total inflow of the six rivers mentioned above accounted for 95.9% of the total inflow to the Danjiangkou Reservoir. The total pollution loads of chemical oxygen demand(CODMn) and total phosphorus(TP) from the six rivers were 58.20 103 t and 1.863 10~3 t, respectively, and the non-point source pollution loads were 39.82 10~3 t and 1.544 10~3 t, respectively, indicating that the non-point source pollution is a major factor(with a contribution rate of 68.4% for CODMnand 82.9% for TP).(2) The Hanjiang River is the most significant contributor of pollution loads to the Danjiangkou Reservoir, and its CODMnand TP contribution rates reached 79.3% and 83.2%, respectively. The Duhe River took the second place.(3) Non-point source pollution mainly occurred in the wet season in 2013, accounting for 80.8% and 90.9% of the total pollution loads of CODMnand TP, respectively. It is concluded that the emphasis of pollution control should be placed on non-point source pollution.展开更多
目的探讨海发菜中多酚提取工艺条件及其抗氧化活性。方法海发菜中多酚用乙醇回流法提取,并用福林酚法测定含量。用DPPH自由基清除法测定海藻多酚体外抗氧化能力,并观察海藻多酚对小鼠皮肤光老化作用。结果最佳提取条件为70%乙醇、回流2 ...目的探讨海发菜中多酚提取工艺条件及其抗氧化活性。方法海发菜中多酚用乙醇回流法提取,并用福林酚法测定含量。用DPPH自由基清除法测定海藻多酚体外抗氧化能力,并观察海藻多酚对小鼠皮肤光老化作用。结果最佳提取条件为70%乙醇、回流2 h、液固比50 m L/g,海藻多酚提取率为(2.20±0.04)mg/g干海藻,DPPH清除率为37.9%。海藻多酚可明显提高光老化小鼠皮肤中超氧化物歧化酶活性及羟脯氨酸含量,降低丙二醛水平(P<0.05或0.01)。结论海藻多酚具有显著抗氧化活性,可延缓皮肤光老化。展开更多
基金supported by the National Key Research and Development Program of China(Grants No.2016YFC0402204 and 2016YFC0402207)
文摘The estimation of non-point source pollution loads into the Danjiangkou Reservoir is highly significant to environmental protection in the watershed. In order to overcome the drawbacks of traditional watershed numerical models, a base flow separation method was established coupled with a digital filtering method and a flux method. The digital filtering method has been used to separate the base flows of the Hanjiang,Tianhe, Duhe, Danjiang, Laoguan, and Qihe rivers. Based on daily discharge, base flow, and pollutant concentration data, the flux method was used to calculate the point source pollution load and non-point source pollution load. The results show that:(1) In the year 2013, the total inflow of the six rivers mentioned above accounted for 95.9% of the total inflow to the Danjiangkou Reservoir. The total pollution loads of chemical oxygen demand(CODMn) and total phosphorus(TP) from the six rivers were 58.20 103 t and 1.863 10~3 t, respectively, and the non-point source pollution loads were 39.82 10~3 t and 1.544 10~3 t, respectively, indicating that the non-point source pollution is a major factor(with a contribution rate of 68.4% for CODMnand 82.9% for TP).(2) The Hanjiang River is the most significant contributor of pollution loads to the Danjiangkou Reservoir, and its CODMnand TP contribution rates reached 79.3% and 83.2%, respectively. The Duhe River took the second place.(3) Non-point source pollution mainly occurred in the wet season in 2013, accounting for 80.8% and 90.9% of the total pollution loads of CODMnand TP, respectively. It is concluded that the emphasis of pollution control should be placed on non-point source pollution.
文摘目的探讨海发菜中多酚提取工艺条件及其抗氧化活性。方法海发菜中多酚用乙醇回流法提取,并用福林酚法测定含量。用DPPH自由基清除法测定海藻多酚体外抗氧化能力,并观察海藻多酚对小鼠皮肤光老化作用。结果最佳提取条件为70%乙醇、回流2 h、液固比50 m L/g,海藻多酚提取率为(2.20±0.04)mg/g干海藻,DPPH清除率为37.9%。海藻多酚可明显提高光老化小鼠皮肤中超氧化物歧化酶活性及羟脯氨酸含量,降低丙二醛水平(P<0.05或0.01)。结论海藻多酚具有显著抗氧化活性,可延缓皮肤光老化。
