Contrastive analysis in space and on time of urban ecosystem niche-fitness
LIAO Hong-juan, XU Jian-hua, YUE Wen-ze (Department of Geography. East China Normal University. Shanghai 200062. China)
Basing on the previous research, we develop the niche-fitness theory of urban system and modify the model. First,we select 21 indexes such as GDP growing rate, average income etc. to establish the niche-index system. Then, taking 35 cities of China for example, we calculate five kinds of niche-fitness values from 1996—2000, namely niche-fitness of economic development and income, environmental niche-fitness, niche-fitness of foundational establishment, niche-fitness of education and health, and average niche-fitness. Analyzing the result, we draw the following conclusions: (1)Niche-fitness values of urban ecosystem not only are different in space in time, but change when ecological factors given different weights. (2) Five kinds of niche-fitness of 35 Chinese cities have different rules in space. (3) Five kinds of niche-fitness of 35 cities have different rules with time. (4) Of the five kinds of niche-fitness, that of foundational establishment of 32 cities is the lowest; environmental niche-fitness of 27 cities is the highest. Among all the cities, Shenzhen has the highest values of the five kinds of niche-fitness. Shijiazhuang has the lowest environmental niche; Yinchuan has the lowest niche-fitness of foundational establishment; as for as the other three kinds of niche-fitness, Guiyang has the lowest values.