Based on the meteorological data of 20 stations in the Hengduan Mountains region during 1961-2009,the annual and seasonal variation of potential evapotranspirat
The SO2 emission sources of the Chengdu-Chongqing economic zone were divided into 556 emissions units according to four different categories,which are city,indu
During November-December 2010 aerosol scattering coefficients were monitored using a single-waved (525 nm) Nephelometer at a regional monitoring station in the
This paper attempts to explore the temporal and spatial nature of the marginal revenue of land,total factor productivity (TFP) change and its three components:t