
Landscape pattern evolution and driving factors of Songhua River wetland in Harbin
ZHAO Zhiqiang, XU Xiaolong, YUAN Qing, WU Yan
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2) : 219-226.
Landscape pattern evolution and driving factors of Songhua River wetland in Harbin
【Objective】 The Songhua River wetland is the most important ecosystem barrier in Harbin. This paper quantitatively studied the evolution and main influencing factors of the landscape pattern of the Songhua River wetland ecosystem in Harbin over the past 20 years, and we aim to provide a reference for wetland planning. 【Method】 Choosing the Harbin basin and its surrounding ecological area as the research object, Landsat remote sensing images from 2000, 2005, 2010, 2015 and 2020 were processed with the help of the GIS platform. The Fragstats software was used to analyze the regional landscape pattern index and explore the spatio-temporal evolution characteristics of the landscape pattern. Finally, SPSS was used for the statistical analysis of the factors affecting landscape pattern. 【Result】 (1) From 2000 to 2020, the water area (including wetland) continuously increased, while the cultivated-land area continuously decreased, which was the primary change feature of landscape pattern in the study area. The decreasing cultivated land was the main contributing factor of increasing water area, grassland, construction land, forest land and other land areas at 343.142 1, 2.484 9, 94.041 9, 35.469 0 and 1.980 0 km2, respectively; among them, the growth rate of water area, grassland, forest area and other land area exceeded 100%, and the area expansion showed an upward trend. (2) From the perspective of plaque types, the degree of fragmentation of each plaque increased to varying degrees during the 20 years, and the wetland landscape type structure tended to be complicated. From the landscape-level perspective, the overall landscape richness has increased, but the connectivity was poor, and the degree of external interference was relatively significant. (3) Urban economic development, climate and industrial structure were the main driving factors to stimulate the change of landscape pattern of the Songhua River wetland in Harbin. With the establishment of the Songbei District and the rise of tourism, relevant infrastructure has crowded the space of some water areas (including wetlands) along the river; wetland marshes and cultivated land have been divided into numerous patches, the overall landscape pattern tends to be fragmented, and human drivers have gradually become the dominant factors. 【Conclusion】 The landscape type of the Songhua River wetland in Harbin is a complicated structure. As human influence factors become more profound, the fragmentation degree of water patches increases, there is a serious loss of cultivated-land area, and the contradiction between cultivated-land protection and ecological protection remains prominent.
Songhua River wetland / landscape pattern / driving factor / principal component analysis(PCA) / Harbin City
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