| Much of the wetland has been lost because of intensified human activities.Study on ecological environment evolution and restoration strategies of wetlands is of significant importance for protecting wetland ecological environment.The general situation of natural geography and wetlands resource in Liaohe River were firstly summarized in this paper.Based on the remote sensing image interpretation results of Liaohe River basin in 2000,2010 and 2015,the land-use situation and changes of landscape pattern were investigated in this study.According to the analysis results above,three typical wetlands(Puhe wetland,Panjin wetland and Lianhuahu wetland)were selected as the study objects.The characteristics of the three wetlands were thoroughly investigated from hydrology,soil and biology.Then draws the reasons on the degradation of the typical wetlands and restoration strategies.Based on the analysis of fundamental statistics,the area of typical wetlands reduces,the reasons on the degradation are analyzed.The main factor of the degradation of Panjin wetland is the disturbance of human activities,such as crude oil exploitation.Polution sources is the dominating reason of degradation of Puhe wetland.The main factors of the degradation of Lianhuahu wetland are the poor quality of water resource and the construction of new city.On account of the analysis of reasons of the degradation about the three typical wetlands,in consideration of feasibility of wetland restoration,the corresponding restoration strategies are proposed.Focus on oil exploration and ecological construction in Panjin wetland.We should make the surrounding factories and enterprises normalized and established buffer strips of vegetation protection in Puhe wetland.In Lianhuahu wetland,we should improve wetland infrastructure and reinforce water quality monitoring.The aquatic eco-functional zoning of three typical wetlands was determined and the management targets of short-term,medium-term and long-term goals were put forward. |
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