Progress in the Studies of Insect Symbiont Wolbachia Spatial and temporal change in ecological assets in the Yangtze River Delta of China 1995-2007 Effects of permanent raised beds on soil salinity in oasis irrigation districts Dynamics in spatial and temporal change of sandy land in Horqin since the 50s of the 20th century Monitoring on spatial and temporal changes of snow cover in the Heilongjiang Basin based on remote sensing.