The long-term temporal and spatial dynamics of marine coastal water quality in Tolo Harbor, Hong Kong were explored. The Harbor is divided into three zones represented as Harbor, Buffer, and Channel Subzones. The time...The long-term temporal and spatial dynamics of marine coastal water quality in Tolo Harbor, Hong Kong were explored. The Harbor is divided into three zones represented as Harbor, Buffer, and Channel Subzones. The time range for the study covers the period from the 1970s to the 1990s. The selected indicators for the comprehensive assessment of water quality consist of physical, chemical and biological aspects, including suspended solids(SS), Secchi disk depth(SD), 5-day biochemical oxygen demand(BOD\-5), total nitrogen(TN), total phosphorus(TP), faecal coliform, chlorophyll-a(Chl-a), and the number of red tide occurrences. The results indicated the presence of obvious temporal and spatial trends with regard to changes in water quality. Spatially, water quality in the Channel Subzone is the best, while that in the Harbor Subzone is the worst. On a temporal basis, the average trend from bad to good was 1980s>1990s>1970s as indicated by most of the selected water quality indicators. Water quality during the late 1980s reached its worst level with the lowest SD, the highest BOD\-5, TN, TP, Chl-a concentrations, and the number of red tide occurrences. These long-term temporal-spatial water quality trends were also found in other studies of the Tolo Harbor. The large quantity of pollutants produced as a result of increasing population, industrial and commercial actives, and urbanization and industrialization trends in both Shatin and Tai Po seem to be primarily responsible for the changes in marine coastal water quality.展开更多
Specific changes in land use can,and often do,occur when any social economic system moves from one form to another.When traditional societies transit from traditional land uses to philosophically determined land uses,...Specific changes in land use can,and often do,occur when any social economic system moves from one form to another.When traditional societies transit from traditional land uses to philosophically determined land uses,as in the case ofthe introduction of socialism or the transition from system ofplanned economy to a market system,suchchanges seem concentrated and perhaps exacerbated.Certainly,such circumstances provide the opportunity to see the process of social philosophy and its impact upon land use in a telescoped fashion.The discovery and explanation of these elements might provide some insight into basic human behavior, and its relationship to social control and how people organize space both with and without control. This paper presents the results of observations of changes in land useas they have occurred during the course of transitional economic development in Beijing, China for the past decade.It suggests three new generic categories that can be applied to any culture or society.展开更多
文摘The long-term temporal and spatial dynamics of marine coastal water quality in Tolo Harbor, Hong Kong were explored. The Harbor is divided into three zones represented as Harbor, Buffer, and Channel Subzones. The time range for the study covers the period from the 1970s to the 1990s. The selected indicators for the comprehensive assessment of water quality consist of physical, chemical and biological aspects, including suspended solids(SS), Secchi disk depth(SD), 5-day biochemical oxygen demand(BOD\-5), total nitrogen(TN), total phosphorus(TP), faecal coliform, chlorophyll-a(Chl-a), and the number of red tide occurrences. The results indicated the presence of obvious temporal and spatial trends with regard to changes in water quality. Spatially, water quality in the Channel Subzone is the best, while that in the Harbor Subzone is the worst. On a temporal basis, the average trend from bad to good was 1980s>1990s>1970s as indicated by most of the selected water quality indicators. Water quality during the late 1980s reached its worst level with the lowest SD, the highest BOD\-5, TN, TP, Chl-a concentrations, and the number of red tide occurrences. These long-term temporal-spatial water quality trends were also found in other studies of the Tolo Harbor. The large quantity of pollutants produced as a result of increasing population, industrial and commercial actives, and urbanization and industrialization trends in both Shatin and Tai Po seem to be primarily responsible for the changes in marine coastal water quality.
文摘Specific changes in land use can,and often do,occur when any social economic system moves from one form to another.When traditional societies transit from traditional land uses to philosophically determined land uses,as in the case ofthe introduction of socialism or the transition from system ofplanned economy to a market system,suchchanges seem concentrated and perhaps exacerbated.Certainly,such circumstances provide the opportunity to see the process of social philosophy and its impact upon land use in a telescoped fashion.The discovery and explanation of these elements might provide some insight into basic human behavior, and its relationship to social control and how people organize space both with and without control. This paper presents the results of observations of changes in land useas they have occurred during the course of transitional economic development in Beijing, China for the past decade.It suggests three new generic categories that can be applied to any culture or society.
