The Changing Process of Wetland Landscape in Honghe National Nature Reserve and Surrounding Farms in Sanjiang Plain
三江平原洪河自然保护区及周边地区湿地景观变化过程研究

We select our study area of Honghe National Nature Reserve and three surrounding farms located in Sanjiang Plain in the northeast of China.Supported by the high resolution image , the authors interpret three periods' remote sensing images of this area to quantify dynamically changed information of six classes of landscape (marsh , river & pool , forest , paddy field , dry land , other types).By means of GIS methods , they analyze the changing process of this area and contrasted the classes of landscape in the middle of 70's and those in recent years with the development of local agricultural activities.In conclusion , this study shows that all kinds of landscape have experienced severe change , especially the changing process of paddy field and dry land.In addition , different changing processes occurred in four areas.Among them , sharpest decrease in wetland area has taken place in Qianfeng farm which is the earliest developed one in this area.Although a series of strict measures have been adopted , Honghe National Nature Reserve has gone through wetland degradation to some extent as a result of the space-narrowed environmental habitat and the influence of surrounding farms.