Study of flood and waterlogging disasters and ecological disaster reducing strategies in Jianghan Plains lakes district;

Ecological disasters can be divided into natural ecological disasters and social ones.

There are many types of ecological disasters in Hebei Province including drought and flood ,soil and water loss, sand storm, geological disasters and plant diseases, etc.

However,one of the important factors that restict the economic development in the joint areas is the ecological disasters.

Risk assessment of ecological disasters in Jilin Province based on GIS;

This paper,by means of a vast amount of data, expounds the present ecological catastrophe caused by the drastic decrease of forest resources and biodiversity and the sharp increase of soil erosion and desertification in China and epitomizes our stratigic ecological protection work for the purpose of preventing ecological catastrophe.

General evolution research,based on the new achievements of science in the 20th century,studies the whole process including cosmic evolution,material evolution,living evolution,cultural evolution and social evolution,and discovers the laws in it,with which can guide the evolution of human society——to resolve global problems and avoid ecological catastrophe.