Wuchuan Gelao and Miao Autonomous County is located in the northeast of Guizhou Province,and in the border of Guizhou and Chongqing,having a subtropical humid monsoon climate. There is no severe heat in summer,and no ...Wuchuan Gelao and Miao Autonomous County is located in the northeast of Guizhou Province,and in the border of Guizhou and Chongqing,having a subtropical humid monsoon climate. There is no severe heat in summer,and no severe cold in winter. It has distinct national characteristics,and there are many biological resources with national characteristics. A systematic investigation of biological resources in the county for nearly a month was carried out by organizing a professional investigation team. The investigation covered 5 townships and we visited 12 village committees and 26 villagers' groups,involving three ethnic groups: Gelao,Tujia and Miao. The biological resources closely related to the agricultural production and life of local ethnic groups were investigated,collected and sorted out. A total of 230 samples of all kinds of resources were collected,including 47 food crops,75 vegetables and annual crops,37 fruit trees and perennial crops,and 71 medicinal plants. Of these,a total of 73 were unique,superior and special resources. Based on general investigation and professional investigation,this paper analyzes the present situation,growth and decline of local agricultural biological resources,and puts forward some suggestions for the protection,development and utilization of agricultural biological resources.展开更多
为了解广东吴川市近岸海域表层沉积物中重金属的污染状况,2020年10月底在吴川市近岸海域采集了41个站点的表层沉积物,系统地进行了典型重金属检测与沉积物粒度分析,并运用单因子指数法、富集因子评价法和潜在生态风险指数法对研究区内...为了解广东吴川市近岸海域表层沉积物中重金属的污染状况,2020年10月底在吴川市近岸海域采集了41个站点的表层沉积物,系统地进行了典型重金属检测与沉积物粒度分析,并运用单因子指数法、富集因子评价法和潜在生态风险指数法对研究区内重金属的污染程度进行评价,分析了沉积物粒径大小对重金属含量分布的影响,并讨论了重金属的可能来源。研究结果表明:重金属含量分布由西向东总体上呈高-低-高的趋势,高值区主要分布在西部近岸、东北部和东南部,低值区主要分布在北部和西南部,平均含量依次为Zn>Cr>Pb>Cu>As>Cd,均符合国家一类沉积物质量标准。通过计算得出,吴川海域表层沉积物中6种重金属元素的污染程度排序为Cu≈Cr>Pb>Cd>Zn>As,单因子污染指数均<1;重金属富集程度主要集中在强富集,平均富集系数排序为Cu>Pb>Zn>Cr>Cd>As;吴川海域的近岸海洋生态环境受到一定污染,E i r的平均值排序为:Cd>Cu>Pb>As>Cr>Zn,仅有29.2%的站点属于轻微风险,其中对综合潜在生态风险指数影响最大的重金属元素是Cd,综合分析可得,重金属的毒理作用占主导因素,推断养殖场废水、工业废水是造成此风险指数较高的主要原因。研究区内表层沉积物中6种重金属的分布均遵循“元素粒度控制规律”,即重金属含量与沉积物平均粒径(Mz)呈显著正相关。此外,重金属之间的相关性分析结果表明,Cu、Pb、Zn、Cr、As主要来源于陆域岩石自然风化剥蚀,Cd受人类活动影响导致变异系数偏高。展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.31872946)National Key R&D Program(2016YFD0100204-8)+2 种基金National Basic Project of Science and Technology(2012FY110200)National Characteristic Vegetable Industry Technology System(CARS-24-A-01)Crop Germplasm Resources Protection Project of the Ministry of Agriculture(2016NWB037)
文摘Wuchuan Gelao and Miao Autonomous County is located in the northeast of Guizhou Province,and in the border of Guizhou and Chongqing,having a subtropical humid monsoon climate. There is no severe heat in summer,and no severe cold in winter. It has distinct national characteristics,and there are many biological resources with national characteristics. A systematic investigation of biological resources in the county for nearly a month was carried out by organizing a professional investigation team. The investigation covered 5 townships and we visited 12 village committees and 26 villagers' groups,involving three ethnic groups: Gelao,Tujia and Miao. The biological resources closely related to the agricultural production and life of local ethnic groups were investigated,collected and sorted out. A total of 230 samples of all kinds of resources were collected,including 47 food crops,75 vegetables and annual crops,37 fruit trees and perennial crops,and 71 medicinal plants. Of these,a total of 73 were unique,superior and special resources. Based on general investigation and professional investigation,this paper analyzes the present situation,growth and decline of local agricultural biological resources,and puts forward some suggestions for the protection,development and utilization of agricultural biological resources.
文摘为了解广东吴川市近岸海域表层沉积物中重金属的污染状况,2020年10月底在吴川市近岸海域采集了41个站点的表层沉积物,系统地进行了典型重金属检测与沉积物粒度分析,并运用单因子指数法、富集因子评价法和潜在生态风险指数法对研究区内重金属的污染程度进行评价,分析了沉积物粒径大小对重金属含量分布的影响,并讨论了重金属的可能来源。研究结果表明:重金属含量分布由西向东总体上呈高-低-高的趋势,高值区主要分布在西部近岸、东北部和东南部,低值区主要分布在北部和西南部,平均含量依次为Zn>Cr>Pb>Cu>As>Cd,均符合国家一类沉积物质量标准。通过计算得出,吴川海域表层沉积物中6种重金属元素的污染程度排序为Cu≈Cr>Pb>Cd>Zn>As,单因子污染指数均<1;重金属富集程度主要集中在强富集,平均富集系数排序为Cu>Pb>Zn>Cr>Cd>As;吴川海域的近岸海洋生态环境受到一定污染,E i r的平均值排序为:Cd>Cu>Pb>As>Cr>Zn,仅有29.2%的站点属于轻微风险,其中对综合潜在生态风险指数影响最大的重金属元素是Cd,综合分析可得,重金属的毒理作用占主导因素,推断养殖场废水、工业废水是造成此风险指数较高的主要原因。研究区内表层沉积物中6种重金属的分布均遵循“元素粒度控制规律”,即重金属含量与沉积物平均粒径(Mz)呈显著正相关。此外,重金属之间的相关性分析结果表明,Cu、Pb、Zn、Cr、As主要来源于陆域岩石自然风化剥蚀,Cd受人类活动影响导致变异系数偏高。
