Efficiency and sustainability of grain production are now important in China.In this study,the grain pro duction systems of Jiangsu and Shaanxi Provinces were c
Intervening opportunity is an important factor in spatial interaction, and has very important impacts on tourist destination development in a region. There are
The dry-hot valley of the Jinsha River is one of the typical eco-fragile areas in Southwest China, as well as a focus ofrevegetation study in the upper and midd
Surface sink is a main geological calamity of gold mining areas and a main factor to restrict economic sustainable development of mining zone. Based on former i
In terms of demands of rice farming in the southern China, the information processing system and the yield measurement system that is installed in combine harve