The traceability system can effectively reduce the food safety risks, however, it is confronted with various problems during its implementation. In this context
Land use/coverage change(LUCC)exerts a profound influence on global carbon emission through changing structure and functions of ecosystem.Taking Nanchang City a
On the basis of input-output table of Henan Province and China in 2007, this paper advances a simple method of constructing two-region input-output model using
We take three types of tidal marshes in Shanghai City as the study object:tidal marshes in mainland,tidal marshes in the rim of islands,and shoal in Yangtze est
Taking the rural economic indicator data in 17 cities (regions) of Hubei Province in 2009 as samples, this paper establishes evaluation index system of rural ec