Abstract
Affected by human activities and natural factors, the area of the Huixian karst wetland has been shrinking in recent years. As the main data source, Landsat5 TM remote sensing image was used to analyze the trend of wetland landforms and its driving factors. The changes of various types and the sensitivity of water influencing factors of Huixian wetland in the past 30 years were analyzed by visual interpretation, supervised classification and geographic information system. The analysis results show that the water area of the wetland has decreased significantly in the past 30 years, and the reduction is 4.52 km2.The fish pond area appears an increasing trend, and the increase is 2.81 km2.The increase of farmland and vegetation is 1.66 km2 and 0.33 km2 respectively. The increase of fish ponds is much smaller than the reduction of water bodies.Water bodies have been developed into farmland or vegetation land. The main driving factor of land type change is human activity, and natural driving is secondary.Sensitivity analysis shows that water for agriculture and fish ponds is the most important factor contributing to the shrinkage of natural water bodies in Huixian wetland.
Highlights
Wetland is one of the most important living environment for human beings and one of the richest biodiversity ecosystems in nature [1]
The main driving factor of land type change is human activity,and natural driving is secondary.Sensitivity analysis shows that water for agriculture and fish ponds is the most important factor contributing to the shrinkage of natural water bodies in Huixian wetland
Guilin Huixian Wetland is the largest natural karst wetland in China known in low and medium altitude karst areas in China [5]. It is located in the watershed of Lijiang River and Liujiang River Basin, the first tributary of the Pearl River system
Summary
The changes of various types and the sensitivity of water influencing factors of Huixian wetland in the past 30 years were analyzed by visual interpretation, supervised classification and geographic information system. The analysis results show that the water area of the wetland has decreased significantly in the past 30 years, and the reduction is 4.52 km.The fish pond area appears an increasing trend, and the increase is 2.81 km.The increase of farmland and vegetation is 1.66 km and 0.33 km respectively. The increase of fish ponds is much smaller than the reduction of water bodies.Water bodies have been developed into farmland or vegetation land. The main driving factor of land type change is human activity,and natural driving is secondary.Sensitivity analysis shows that water for agriculture and fish ponds is the most important factor contributing to the shrinkage of natural water bodies in Huixian wetland
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