JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (8): 1383-1394.

### Characteristics, Hotspots and Influencing Factors of Wetland Change in Huaihe River Basin

XU Li-li1, WAN Yun1, SHENG Sheng1 2, WEN Teng1, XU Chi1, AN Shu-qing1

1. 1. School of Life Sciences, Nanjing University, Nanjing 210093, China;
2. HydroChina Huadong Engineering Corporation, Hangzhou 310014, China
• Received:2012-08-29 Revised:2013-01-09 Online:2013-08-20 Published:2013-08-19

Abstract: Using Landsat remote sensing data, we study the size change of each wetland type in Huaihe River Basin from 1995 to 2007 quantitatively and analyze the characteristics of wetland change. Then we identify the hotspots of wetland change using neighborhood analysis and study the influencing factors of spatial differentiation of wetland change hotspots by constructing Logistic regression model. Results show a remarkable increase in artificial wetlands (including paddy fields, reservoir and ponds), but a distinct decrease of natural wetlands (mainly referring to swamps and lakes) during the research period. Increase amount of paddy fields and reservoir ponds are 10296.05 km2 and 2796.45 km2, which account for 16.81% and 4.57% of the total wetland area of the Huaihe River Basin and 3.82% and 1.04% of the whole basin area in 1995 respectively. Decrease amount of lakes and swamps are 648.22km2 and 1705.97 km2, which account for 1.06% and 2.79% of the total wetland area of the Huaihe River Basin and 0.24% and 0.63% of the whole basin area in 1995 respectively. The decreased swamps and lakes are principally converted to artificial wetlands. Hotspots of wetland change are mostly distributed in the eastern and southern part of Huaihe River Basin. And hotspots of artificial wetlands change exhibit a more concentrated and continuous distribution, but that of natural wetlands are sparser and more disperse. Among all natural and geographical influencing factors, elevation and temperature have relatively higher impacts on the occurrence of artificial wetlands increase hotspots and natural wetlands decrease hotspots. And there is a high incidence of wetland change hotspots in areas which have relatively higher temperature and are lower lying. Moreover, wetland change hotspots are also inclined to occur in areas having relatively lower precipitation. Socio-economic factors and transport accessibility play a significant but less important role in hotspots occurrence. For the socio-economic influencing factors, artificial wetland increase hotspots are prone to occur in areas which have higher economic output value, while natural wetland decrease hotspots are apt to distribute in areas which have lower economic output value. As for transport accessibility, artificial wetland increase hotspots mostly occur in the area far from the high grade road and close to residential area, and natural wetland change hotspots mainly occur in the area far from the residential area. In Huaihe River Basin, the hotspots occurrence of wetland change is affected by the coupling effect of multiple factors, but the restriction effect of physicographica background is the primary factor leading to spatial differentiation of wetland change hotspots.

CLC Number:

• X37