To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the purifying effects of wetland in Fujin National Wetland Park(FNWP), China, the trophic level index(...To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the purifying effects of wetland in Fujin National Wetland Park(FNWP), China, the trophic level index(TLI), paired samples t-test and correlation analysis were used for the statistical analysis of a set of 10 water quality parameters. The analyses were based on water samples collected from 22 stations in FNWP between 2014 and 2016. Results initially reveal that total nitrogen(TN) concentrations are above class V levels(2 mg/L), total phosphorus(TP) concentrations are below class Ⅲ levels(0.2 mg/L), and that all other parameters fall within standard ranges. Highest values for TN, pH, and Chlorophyll-a were recorded in 2016, while the levels of chemical oxygen demand(COD_(Mn)) and biochemical oxygen demand(BOD5) were lowest during this year. Similarly, TN values were highest between 2014 and 2016 while dissolved oxygen(DO) concentrations were lowest in the summer and TP concentrations were highest in the autumn. Significant variations were also found in Secchi depth(SD), TN, CODMn(P < 0.01), TP, and DO levels(P < 0.05) between the inlet and outlet of the park. High-to-low levels of TN, TP, and TDS were found in cattails, reeds, and open water(the opposite trend was seen in SD levels). Tested wetland water had a light eutrophication status in most cases and TN and TP removal rates were between 7.54%–84.36% and 37.50%–70.83%, respectively. Data also show no significant annual changes in water quality within this wetland, although obvious affects from surrounding agricultural drainage were nevertheless recorded. Results reveal a high major nutrient removal efficiency(N and P). The upper limits of these phenomena should be addressed in future research alongside a more efficient and scientific agricultural layout for the regions in and around the FNWP.展开更多
为了研究2016年新疆地区近地面PM_(2.5)浓度的时空分布,利用MODIS/Terra 10 km AOD数据和气象数据,结合卫星过境时地面监测的PM_(2.5)数据,采用地理加权回归的方法,构建了新疆地区PM_(2.5)遥感反演模型.结果表明:基于地理加权回归模型...为了研究2016年新疆地区近地面PM_(2.5)浓度的时空分布,利用MODIS/Terra 10 km AOD数据和气象数据,结合卫星过境时地面监测的PM_(2.5)数据,采用地理加权回归的方法,构建了新疆地区PM_(2.5)遥感反演模型.结果表明:基于地理加权回归模型反演所得地面PM_(2.5)浓度相关系数R2为0.87,优于多元线性回归模型的0.78.在时间上,新疆地区PM_(2.5)浓度2016年1月份最高,为132.07μg/m3,3月份次之,达到113.22μg/m3,9月份最低,为28.55μg/m3;在空间上,总体来看2016年新疆喀什、和田以及库尔勒北部地区PM_(2.5)浓度较高,采暖季乌鲁木齐市附近PM_(2.5)浓度明显升高.展开更多
基金Under the auspices of the National Natural Science Foundation of China(No.D41271106)the National Key Research and Development Program of China(No.2016YFA0602303)
文摘To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the purifying effects of wetland in Fujin National Wetland Park(FNWP), China, the trophic level index(TLI), paired samples t-test and correlation analysis were used for the statistical analysis of a set of 10 water quality parameters. The analyses were based on water samples collected from 22 stations in FNWP between 2014 and 2016. Results initially reveal that total nitrogen(TN) concentrations are above class V levels(2 mg/L), total phosphorus(TP) concentrations are below class Ⅲ levels(0.2 mg/L), and that all other parameters fall within standard ranges. Highest values for TN, pH, and Chlorophyll-a were recorded in 2016, while the levels of chemical oxygen demand(COD_(Mn)) and biochemical oxygen demand(BOD5) were lowest during this year. Similarly, TN values were highest between 2014 and 2016 while dissolved oxygen(DO) concentrations were lowest in the summer and TP concentrations were highest in the autumn. Significant variations were also found in Secchi depth(SD), TN, CODMn(P < 0.01), TP, and DO levels(P < 0.05) between the inlet and outlet of the park. High-to-low levels of TN, TP, and TDS were found in cattails, reeds, and open water(the opposite trend was seen in SD levels). Tested wetland water had a light eutrophication status in most cases and TN and TP removal rates were between 7.54%–84.36% and 37.50%–70.83%, respectively. Data also show no significant annual changes in water quality within this wetland, although obvious affects from surrounding agricultural drainage were nevertheless recorded. Results reveal a high major nutrient removal efficiency(N and P). The upper limits of these phenomena should be addressed in future research alongside a more efficient and scientific agricultural layout for the regions in and around the FNWP.
文摘为了研究2016年新疆地区近地面PM_(2.5)浓度的时空分布,利用MODIS/Terra 10 km AOD数据和气象数据,结合卫星过境时地面监测的PM_(2.5)数据,采用地理加权回归的方法,构建了新疆地区PM_(2.5)遥感反演模型.结果表明:基于地理加权回归模型反演所得地面PM_(2.5)浓度相关系数R2为0.87,优于多元线性回归模型的0.78.在时间上,新疆地区PM_(2.5)浓度2016年1月份最高,为132.07μg/m3,3月份次之,达到113.22μg/m3,9月份最低,为28.55μg/m3;在空间上,总体来看2016年新疆喀什、和田以及库尔勒北部地区PM_(2.5)浓度较高,采暖季乌鲁木齐市附近PM_(2.5)浓度明显升高.
