Experiments of co-culture with Pavlova viridis and Tetraselmis tetrethele were carried out. Results showed a transparent phenomenon of interspecific competition between them. The competition was identified as an explo...Experiments of co-culture with Pavlova viridis and Tetraselmis tetrethele were carried out. Results showed a transparent phenomenon of interspecific competition between them. The competition was identified as an exploitation type through analysis. In the co-culture, both the growth rate (r) and the carrying capacity (K) of two species were affected, with a greater influence on P. viridis than on T. tetrethele,according to the comparision with those from the pure culture of two species. Each of interspecific competitive parameters of one species to the other was calculated,and the results showed that T.tetrethele possessed a more interspecific competitive capacity. Meanwhile, under the co-culture condition, both of the carrying capacity of two species were closely related to their respective inoculation density.The growth rate of P. viridis was in a positive proportion to its inoculation density, while a negative one existed in T. tetrethele.展开更多
Based on the investigation data and relevant statistical data recently, with the methods of principle components analysis and cluster analysis, the present situation of grassland agriculture development and its sustai...Based on the investigation data and relevant statistical data recently, with the methods of principle components analysis and cluster analysis, the present situation of grassland agriculture development and its sustainable degree of 30 poor counties located in karst mountains of Guangxi, Yunnan and Guizhou Provinces was studied. In the light of universal situation of the 30 poor counties, the index system of population, resources, environment, social and economic development for evaluating the sustainability degree of the local grassland agriculture system were determined preliminarily. By analyzing and calculating, the comprehensive index of grassland agriculture system sustainability of every county among the 30 poor counties have been obtained, and the comprehensive classification, order and evaluation for the present sustainable development degree of the 30 poor ones have been carried out.展开更多
文摘Experiments of co-culture with Pavlova viridis and Tetraselmis tetrethele were carried out. Results showed a transparent phenomenon of interspecific competition between them. The competition was identified as an exploitation type through analysis. In the co-culture, both the growth rate (r) and the carrying capacity (K) of two species were affected, with a greater influence on P. viridis than on T. tetrethele,according to the comparision with those from the pure culture of two species. Each of interspecific competitive parameters of one species to the other was calculated,and the results showed that T.tetrethele possessed a more interspecific competitive capacity. Meanwhile, under the co-culture condition, both of the carrying capacity of two species were closely related to their respective inoculation density.The growth rate of P. viridis was in a positive proportion to its inoculation density, while a negative one existed in T. tetrethele.
文摘Based on the investigation data and relevant statistical data recently, with the methods of principle components analysis and cluster analysis, the present situation of grassland agriculture development and its sustainable degree of 30 poor counties located in karst mountains of Guangxi, Yunnan and Guizhou Provinces was studied. In the light of universal situation of the 30 poor counties, the index system of population, resources, environment, social and economic development for evaluating the sustainability degree of the local grassland agriculture system were determined preliminarily. By analyzing and calculating, the comprehensive index of grassland agriculture system sustainability of every county among the 30 poor counties have been obtained, and the comprehensive classification, order and evaluation for the present sustainable development degree of the 30 poor ones have been carried out.
