Wetland is a kind of key natural resources.However,the wetlands have been shrinking rapidly in Sangjiang Plain and its functions have been degrading.These all hold back the sustainable development of human communities...Wetland is a kind of key natural resources.However,the wetlands have been shrinking rapidly in Sangjiang Plain and its functions have been degrading.These all hold back the sustainable development of human communities,and lead to great change in the land use/cover(LUCC),consequently caused global changes in climate,water cycling,etc..Taken Fujin region as a case study,spatial and temporal dynamic processes of wetland and its driving forces were analyzed from 1954 to 2000 in this paper.It showed that the wetlands had been reduced from 52×104 ha to 11×104 ha in areas during the nearly 50 years.The percentage of wetland areas reduced from 61.27%to 12.39%.On the other hand,cultivated land increased from 22×104 ha to 60×104 ha in areas.The percentage of the areas increased from 25.31%to 70.45%.Further quantitative analysis of the wetland landscape conversion characteristics and the correlation analysis between the change of wetland areas and population increase were made.The results showed that 40×104 ha wetlands had been converted to cultivated land within half of a century;the correlation between the rate of wetland loss and that of population increased is nearly-0.922.So it was concluded that the main driving force of wetland shrinkage in Fujin region was the colonization of human being.展开更多
To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the puri- fying effects of wetland in Fujin National Wetland Park （FNWP）, China, the trophic level i...To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the puri- fying effects of wetland in Fujin National Wetland Park （FNWP）, China, the trophic level index （TLI）, paired samples t-test and correla- tion 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 de- mand （CODMn） and biochemical oxygen demand （BODs） 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
三江盆地富锦隆起下白垩统发育厚层暗色泥岩,为了恢复这套暗色泥岩的古环境,进行了系统的野外地质调查和取样分析。地球化学特征显示:Sr/Ba比值为0.08~0.20,碳氧同位素系数Z值为106.62~116.03,表明下白垩统为淡水沉积环境,盐度变化相对...三江盆地富锦隆起下白垩统发育厚层暗色泥岩,为了恢复这套暗色泥岩的古环境,进行了系统的野外地质调查和取样分析。地球化学特征显示:Sr/Ba比值为0.08~0.20,碳氧同位素系数Z值为106.62~116.03,表明下白垩统为淡水沉积环境,盐度变化相对稳定;Ti含量为3183×10-6~5239×10-6,Sr/Cu比值为2.53~35.84,Fe/Mn比值为21.15~96.95,表明下白垩统处在温暖湿润的气候条件下;Cu/Zn比值为0.09~0.21,V/V+Ni比值为0.77~0.81,Ce的异常指数为-0.06~0.01,表明下白垩统处在还原环境中。孢粉化石特征显示:Protopodocarpus sp.(原始罗汉松粉未定种)、Aratrisporites fischeri(Klaus)Playford et Dettmann(弗歇尔离层单缝孢)等所指示的植物生长环境为温暖湿润的气候环境。烃源岩元素地球化学特征指示该套地层具有较好的生气前景,温暖湿润的还原环境为有机质生成提供了良好的条件。展开更多
目的:探讨芪楮复筋方对大鼠坐骨神经损伤后的修复作用。方法:45只大鼠采用钳夹左侧坐骨神经法建立坐骨神经损伤模型,术后随机分为模型组、甲钴胺组和芪楮复筋方组。另15只正常大鼠作为正常对照组。甲钴胺组和芪楮复筋方组分别给予甲钴...目的:探讨芪楮复筋方对大鼠坐骨神经损伤后的修复作用。方法:45只大鼠采用钳夹左侧坐骨神经法建立坐骨神经损伤模型,术后随机分为模型组、甲钴胺组和芪楮复筋方组。另15只正常大鼠作为正常对照组。甲钴胺组和芪楮复筋方组分别给予甲钴胺溶液[150 μg/(kg·d)]和芪楮复筋方煎液[35.2 g/(kg·d)]灌胃,模型组给予等量生理盐水灌胃。分别于术后第1、2和4周检测各组大鼠坐骨神经功能指数(sciatic function index,SFI)、腓肠肌湿质量残存率和腓肠肌肌细胞直径,免疫组织化学法检测神经组织S-100表达,电子显微镜观察神经超徽结构的改变。结果:术后第4周,甲钴胺组和芪楮复筋方组SFI、腓肠肌湿质量残存率、肌细胞直径、S-100阳性表达率、有髓神经纤维髓鞘厚度及轴突直径与正常对照组比较,差异有统计学意义(P<0.05.P<0.01),且均优于模型组(P<0.05,P<0.01)。除腓肠肌湿质量残存率和肌细胞直径外,甲钴胺组和芪楮复筋方组各指标间比较差异无统计学意义(P>0.05)。结论:芪楮复筋方可促进周围神经损伤后神经的再生和功能恢复,延缓靶器官肌肉萎缩。展开更多
基金Knowledge innovation item of CAS(KZCX2-308-3-5).
文摘Wetland is a kind of key natural resources.However,the wetlands have been shrinking rapidly in Sangjiang Plain and its functions have been degrading.These all hold back the sustainable development of human communities,and lead to great change in the land use/cover(LUCC),consequently caused global changes in climate,water cycling,etc..Taken Fujin region as a case study,spatial and temporal dynamic processes of wetland and its driving forces were analyzed from 1954 to 2000 in this paper.It showed that the wetlands had been reduced from 52×104 ha to 11×104 ha in areas during the nearly 50 years.The percentage of wetland areas reduced from 61.27%to 12.39%.On the other hand,cultivated land increased from 22×104 ha to 60×104 ha in areas.The percentage of the areas increased from 25.31%to 70.45%.Further quantitative analysis of the wetland landscape conversion characteristics and the correlation analysis between the change of wetland areas and population increase were made.The results showed that 40×104 ha wetlands had been converted to cultivated land within half of a century;the correlation between the rate of wetland loss and that of population increased is nearly-0.922.So it was concluded that the main driving force of wetland shrinkage in Fujin region was the colonization of human being.
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 puri- fying effects of wetland in Fujin National Wetland Park （FNWP）, China, the trophic level index （TLI）, paired samples t-test and correla- tion 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 de- mand （CODMn） and biochemical oxygen demand （BODs） 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.
文摘三江盆地富锦隆起下白垩统发育厚层暗色泥岩,为了恢复这套暗色泥岩的古环境,进行了系统的野外地质调查和取样分析。地球化学特征显示:Sr/Ba比值为0.08~0.20,碳氧同位素系数Z值为106.62~116.03,表明下白垩统为淡水沉积环境,盐度变化相对稳定;Ti含量为3183×10-6~5239×10-6,Sr/Cu比值为2.53~35.84,Fe/Mn比值为21.15~96.95,表明下白垩统处在温暖湿润的气候条件下;Cu/Zn比值为0.09~0.21,V/V+Ni比值为0.77~0.81,Ce的异常指数为-0.06~0.01,表明下白垩统处在还原环境中。孢粉化石特征显示:Protopodocarpus sp.(原始罗汉松粉未定种)、Aratrisporites fischeri(Klaus)Playford et Dettmann(弗歇尔离层单缝孢)等所指示的植物生长环境为温暖湿润的气候环境。烃源岩元素地球化学特征指示该套地层具有较好的生气前景,温暖湿润的还原环境为有机质生成提供了良好的条件。
文摘目的:探讨芪楮复筋方对大鼠坐骨神经损伤后的修复作用。方法:45只大鼠采用钳夹左侧坐骨神经法建立坐骨神经损伤模型,术后随机分为模型组、甲钴胺组和芪楮复筋方组。另15只正常大鼠作为正常对照组。甲钴胺组和芪楮复筋方组分别给予甲钴胺溶液[150 μg/(kg·d)]和芪楮复筋方煎液[35.2 g/(kg·d)]灌胃,模型组给予等量生理盐水灌胃。分别于术后第1、2和4周检测各组大鼠坐骨神经功能指数(sciatic function index,SFI)、腓肠肌湿质量残存率和腓肠肌肌细胞直径,免疫组织化学法检测神经组织S-100表达,电子显微镜观察神经超徽结构的改变。结果:术后第4周,甲钴胺组和芪楮复筋方组SFI、腓肠肌湿质量残存率、肌细胞直径、S-100阳性表达率、有髓神经纤维髓鞘厚度及轴突直径与正常对照组比较,差异有统计学意义(P<0.05.P<0.01),且均优于模型组(P<0.05,P<0.01)。除腓肠肌湿质量残存率和肌细胞直径外,甲钴胺组和芪楮复筋方组各指标间比较差异无统计学意义(P>0.05)。结论:芪楮复筋方可促进周围神经损伤后神经的再生和功能恢复,延缓靶器官肌肉萎缩。
