Festuca rubra is a perennial grass used widely as fodder in Southwest China. It has particularly strong tolerance to heavy metal toxic. Some experiments have revealed that it can withstand very high concentrations(500...Festuca rubra is a perennial grass used widely as fodder in Southwest China. It has particularly strong tolerance to heavy metal toxic. Some experiments have revealed that it can withstand very high concentrations(500μg·g -1 ) of cadmium(Cd) and medium-high concentrations (100 μg·g -1 ) of copper (Cu). Festuca absorbs both Cd and Cu in a bi-phasic pattern. It makes Festuca very useful in the environmental and ecological engineering in removing heavy metal toxic and organic wastes. So, it would be necessary to study its physiology of salt tolerance and find the adapted range to NaCl.This is a preliminary report on salt tolerance of Festuca in sawdust culture. NaCl solution treatment concentrations were divided into 3 groups: 0 5%, 1%, 1 5%. After treatments for two weeks, we measured the amount of the chlorophyll, the soluble sugar content and the calorific values in the species. In this experiment, we used the emergy analysis method and found that the adapted range to NaCl was 0～1%, with optimum about 1%, with lethal threshold above 1 5%.展开更多
Building waterfowls pond and building fish pond for ameliorating saline land are two different models of wetland utilization on seashore in Jiangsu Province, China. In this paper, ecological-economic benefits of the t...Building waterfowls pond and building fish pond for ameliorating saline land are two different models of wetland utilization on seashore in Jiangsu Province, China. In this paper, ecological-economic benefits of the two subsystems are evaluated with emergy analysis method,and some suggestions are given about sustainable development of seashore. Some emergy indices are calculated as following: the emergy investment ratio (Ir) are 7.07 and 1.02×10 -2 ; the Export-feedback ratio (Fr) are 0.457 and 3.95; the Actual emergy yield ratio (Yr) are 54.00 and 4.00×10 -3 , the change of stored emergy (Nc) are 3.65×10 20 J and -5.16×10 19 J. for waterfowl and fish pond,respecfively. These indices show that: First, in order to reduce the habitat pressure of coastal birds, it is necessary to build waterfowl pond at the edge of core zone of natural reserve on seashore. Second, in order to ameliorate saline land rapidly, it is applicable for suitable use in non-core zone of natural reserve and other seashore area. Third, in order to measure coordination between natural reserve and economic development, it is essential that core zone should be enlarged in natural reserve, and the economic development should be limited in buffer zone of natural reserve and non-natural reserve area.展开更多
文摘Festuca rubra is a perennial grass used widely as fodder in Southwest China. It has particularly strong tolerance to heavy metal toxic. Some experiments have revealed that it can withstand very high concentrations(500μg·g -1 ) of cadmium(Cd) and medium-high concentrations (100 μg·g -1 ) of copper (Cu). Festuca absorbs both Cd and Cu in a bi-phasic pattern. It makes Festuca very useful in the environmental and ecological engineering in removing heavy metal toxic and organic wastes. So, it would be necessary to study its physiology of salt tolerance and find the adapted range to NaCl.This is a preliminary report on salt tolerance of Festuca in sawdust culture. NaCl solution treatment concentrations were divided into 3 groups: 0 5%, 1%, 1 5%. After treatments for two weeks, we measured the amount of the chlorophyll, the soluble sugar content and the calorific values in the species. In this experiment, we used the emergy analysis method and found that the adapted range to NaCl was 0～1%, with optimum about 1%, with lethal threshold above 1 5%.
文摘Building waterfowls pond and building fish pond for ameliorating saline land are two different models of wetland utilization on seashore in Jiangsu Province, China. In this paper, ecological-economic benefits of the two subsystems are evaluated with emergy analysis method,and some suggestions are given about sustainable development of seashore. Some emergy indices are calculated as following: the emergy investment ratio (Ir) are 7.07 and 1.02×10 -2 ; the Export-feedback ratio (Fr) are 0.457 and 3.95; the Actual emergy yield ratio (Yr) are 54.00 and 4.00×10 -3 , the change of stored emergy (Nc) are 3.65×10 20 J and -5.16×10 19 J. for waterfowl and fish pond,respecfively. These indices show that: First, in order to reduce the habitat pressure of coastal birds, it is necessary to build waterfowl pond at the edge of core zone of natural reserve on seashore. Second, in order to ameliorate saline land rapidly, it is applicable for suitable use in non-core zone of natural reserve and other seashore area. Third, in order to measure coordination between natural reserve and economic development, it is essential that core zone should be enlarged in natural reserve, and the economic development should be limited in buffer zone of natural reserve and non-natural reserve area.
