Study on the landscape pattern evolution of Geyucheng Natural Reserves

The scientific and reasonable evaluation of ecological pattern and environmental status, as well as the launch of nature conservation and ecological protection and management is of great significance. In this paper, Landsat-TM image data of 2009 and 2013 was selected with Geyucheng as the study area, and analysis is carried out for changes in the landscape of the study area with RS and GIS technology. According to the results, there were different degrees of type transformation in the land use. The number of landscape path increased; the average patch area decreased; the landscape fragmentation degree was aggravated and patch distribution was more separate. Seen from landscape heterogeneity, the difference in the proportion of all patch types increased, which was out of balance. Seen from the complexity of landscape space, the shape of landscape patch tended to be simplified. The overall landscape aggregation degree dropped constantly, and the landscape pattern stability declined, suggesting that the natural landscape was impacted by human disturbance more and more severely.

I. Introduction

Landscape pattern refers to the array of different shapes and sizes of patches in the landscape space, and the analysis of the landscape pattern actually studies the structural changes and space succession of the landscape with the passage of time, which is of great importance for the protection of bio-diversity and improvement of environmental quality (Liu Jianguo, 1995). The landscape pattern index can reflect the overall condition of the landscape, and it is also the quantitative index covering various aspects of information, for instance, the element, the overall structure and spatial distribution condition, etc. With the constant development of the landscape ecology, RS (remote sensing) and GIS (geographic information system) play a significant role in analyzing the changes in landscape pattern and discussion of the spatial evolution rules, and the landscape pattern analysis has already become an important in the study on changes in the pattern of ecological system, which has already attracted extensive attention from numerous scholars.