Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain uncl...Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain unclear.This study aimed to identify the spatial changes in water quality and the driving factors of seven lakes(Juyanhai Lake,Ulansuhai Lake,Hongjiannao Lake,Daihai Lake,Chagannaoer Lake,Hulun Lake,and Wulannuoer Lake)across the longitudinal axis(from the west to the east)of Inner Mongolia.Large-scale research was conducted using the comprehensive trophic level index(TLI(Σ)),multivariate statistics,and spatial analysis methods.The results showed that most lakes in Inner Mongolia were weakly alkaline.Total dissolved solids and salinity of lake water showed obvious zonation characteristics.Nitrogen and phosphorus were identified as the main pollutants in lakes,with high average concentrations of total nitrogen and total phosphorus being of 4.05 and 0.21 mg/L,respectively.The values of TLI(Σ)ranged from 49.14 to 71.77,indicating varying degrees of lake eutrophication,and phosphorus was the main driver of lake eutrophication.The lakes of Inner Mongolia could be categorized into lakes to the west of Daihai Lake and lakes to the east of Daihai Lake in terms of salinity and TLI(Σ).The salinity levels of lakes to the west of Daihai Lake exceeded those of lakes to the east of Daihai Lake,whereas the opposite trend was observed for lake trophic level.The intensity and mode of anthropogenic activities were the driving factors of the spatial patterns of lake water quality.It is recommended to control the impact of anthropogenic activities on the water quality of lakes in Inner Mongolia to improve lake ecological environment.These findings provide a more thorough understanding of the driving mechanism of the spatial patterns of water quality in lakes of Inner Mongolia,which can be used to develop strategies for lake ecosystem protection and water resources management in this region.展开更多
为探究冻融循环条件下粉煤灰对膨胀土未冻水含量的影响,利用低场核磁共振(nuclear magnetic resonance,NMR)技术对不同粉煤灰掺量(3%、6%、9%、12%和15%)的改性膨胀土进行T2谱测定,分析不同温度下改性膨胀土的孔隙结构变化特征,并得出...为探究冻融循环条件下粉煤灰对膨胀土未冻水含量的影响,利用低场核磁共振(nuclear magnetic resonance,NMR)技术对不同粉煤灰掺量(3%、6%、9%、12%和15%)的改性膨胀土进行T2谱测定,分析不同温度下改性膨胀土的孔隙结构变化特征,并得出不同粉煤灰掺量的改性膨胀土未冻水含量的变化规律。试验结果表明:改性膨胀土相较于原状土,微、小孔隙的孔径分布在掺灰比为9%的试样出现降低,其余掺灰比的试样出现增长,掺灰比为6%的试样最显著;中孔隙增幅最显著的是掺灰比为12%的试样,大孔隙增幅最显著的是掺灰比为3%的试样;在冻结过程中,掺灰比为9%的试样未冻水含量在下降阶段变化最快,在融化阶段变化速率最慢;掺入粉煤灰降低了土壤的相变温度,且抑制土体冻结过程中的未冻水含量。展开更多
利用6种不同种类农林废弃物(包括小麦秸秆、花生壳、椰壳等)制备生物炭,研究不同生物炭对水中石油的吸附性能。系统考察生物炭种类及投加量、石油种类及浓度、吸附时间等因素对生物炭吸附水中石油效果的影响。结果表明,不同原料制备的...利用6种不同种类农林废弃物(包括小麦秸秆、花生壳、椰壳等)制备生物炭,研究不同生物炭对水中石油的吸附性能。系统考察生物炭种类及投加量、石油种类及浓度、吸附时间等因素对生物炭吸附水中石油效果的影响。结果表明,不同原料制备的生物炭对水中石油均具有较好的吸附性能,吸附量为142.70~493.86 mg g。其中,以小麦秸秆制备的生物炭对石油的吸附量最大,其总孔体积明显大于其他生物炭,为0.155 cm 3 g,含碳官能团也较多。小麦秸秆生物炭吸附水中石油时最佳投加量(ρ)为0.25 g L,吸附平衡时间为60 min,吸附过程符合准二级动力学方程和Langmuir等温吸附模型,即更接近单分子层吸附。生物炭的吸油性能受到多种因素的影响,通过灰色关联度分析得出水中油浓度对生物炭的石油吸附量影响最大。展开更多
基金funded by the National Key Research and Development Program of China(2021YFC3201203)the Major Science and Technology Projects of Inner Mongolia Autonomous Region(2020ZD0009)+2 种基金the National Natural Science Foundation of China(51869014)the Open Project Program of the Ministry of Education Key Laboratory of Ecology and Resources Use of the Mongolian Plateau(KF2020006)the Special Funds for Innovation and Entrepreneurship of Postgraduates in Inner Mongolia University(11200-121024).
文摘Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain unclear.This study aimed to identify the spatial changes in water quality and the driving factors of seven lakes(Juyanhai Lake,Ulansuhai Lake,Hongjiannao Lake,Daihai Lake,Chagannaoer Lake,Hulun Lake,and Wulannuoer Lake)across the longitudinal axis(from the west to the east)of Inner Mongolia.Large-scale research was conducted using the comprehensive trophic level index(TLI(Σ)),multivariate statistics,and spatial analysis methods.The results showed that most lakes in Inner Mongolia were weakly alkaline.Total dissolved solids and salinity of lake water showed obvious zonation characteristics.Nitrogen and phosphorus were identified as the main pollutants in lakes,with high average concentrations of total nitrogen and total phosphorus being of 4.05 and 0.21 mg/L,respectively.The values of TLI(Σ)ranged from 49.14 to 71.77,indicating varying degrees of lake eutrophication,and phosphorus was the main driver of lake eutrophication.The lakes of Inner Mongolia could be categorized into lakes to the west of Daihai Lake and lakes to the east of Daihai Lake in terms of salinity and TLI(Σ).The salinity levels of lakes to the west of Daihai Lake exceeded those of lakes to the east of Daihai Lake,whereas the opposite trend was observed for lake trophic level.The intensity and mode of anthropogenic activities were the driving factors of the spatial patterns of lake water quality.It is recommended to control the impact of anthropogenic activities on the water quality of lakes in Inner Mongolia to improve lake ecological environment.These findings provide a more thorough understanding of the driving mechanism of the spatial patterns of water quality in lakes of Inner Mongolia,which can be used to develop strategies for lake ecosystem protection and water resources management in this region.
文摘为探究冻融循环条件下粉煤灰对膨胀土未冻水含量的影响,利用低场核磁共振(nuclear magnetic resonance,NMR)技术对不同粉煤灰掺量(3%、6%、9%、12%和15%)的改性膨胀土进行T2谱测定,分析不同温度下改性膨胀土的孔隙结构变化特征,并得出不同粉煤灰掺量的改性膨胀土未冻水含量的变化规律。试验结果表明:改性膨胀土相较于原状土,微、小孔隙的孔径分布在掺灰比为9%的试样出现降低,其余掺灰比的试样出现增长,掺灰比为6%的试样最显著;中孔隙增幅最显著的是掺灰比为12%的试样,大孔隙增幅最显著的是掺灰比为3%的试样;在冻结过程中,掺灰比为9%的试样未冻水含量在下降阶段变化最快,在融化阶段变化速率最慢;掺入粉煤灰降低了土壤的相变温度,且抑制土体冻结过程中的未冻水含量。
文摘利用6种不同种类农林废弃物(包括小麦秸秆、花生壳、椰壳等)制备生物炭,研究不同生物炭对水中石油的吸附性能。系统考察生物炭种类及投加量、石油种类及浓度、吸附时间等因素对生物炭吸附水中石油效果的影响。结果表明,不同原料制备的生物炭对水中石油均具有较好的吸附性能,吸附量为142.70~493.86 mg g。其中,以小麦秸秆制备的生物炭对石油的吸附量最大,其总孔体积明显大于其他生物炭,为0.155 cm 3 g,含碳官能团也较多。小麦秸秆生物炭吸附水中石油时最佳投加量(ρ)为0.25 g L,吸附平衡时间为60 min,吸附过程符合准二级动力学方程和Langmuir等温吸附模型,即更接近单分子层吸附。生物炭的吸油性能受到多种因素的影响,通过灰色关联度分析得出水中油浓度对生物炭的石油吸附量影响最大。
