Abstract: Dongting lake region is located in the middle reaches of the Yangtze Valley. The wetland in Dongting lake region is the largest lacustrine in China, which is 8.77?10⁵ha.It can be divided into three types: the shallow waters, thelake and river shore,and the Paddy fields.Akong with the frequent redaimation on wetlands,it has made some harmful influence on the environment, i.e., the severe flooding, inundation, and water-logging,neduced wetland areas,and degraded ecological functions.In order to utilize and protect the wetland rationally, the following measures must be taken: 1)controlling the scale of wetlands reclaimation and making great efforts to construct high-efficient ecosystems; 2)stabilizing the area of wetland; 3)strengthening comprehensive management of wetland. According to the principles of ecological engineering and previous practices, comprehensive utilization models which are suitable to the shallow waters, lake and river shore,and Paddy fields were constructed.

Key words: Changbai Mountain, altitude, neutral sugar, plant and microorganism contribution, microbial metabolic quotient.