近20年福建红树林和互花米草群落时空变化及景观特征

doi:10.19741/j.issn.1673-4831.2020.0487

Abstract

Abstract: Mangroves and Spartina alterniflora are important coastal wetland vegetation resources in Fujian. Identifying the spatio-temporal distribution and evolution characteristics of mangroves and Spartina alterniflora is of great significance for the safety of coastal ecological environment. Based on the data of multi-source satellite imageries such as Landsat-5 TM, Landsat-7 ETM+, Landsat 8 OIL, Quickbird and GF-1 imageries from 1999 to 2018, the spatial distribution and dynamical change of mangroves and Spartina alterniflora were studied and analyzed using the methods of image processing, geographic information systems (GIS), global positioning system (GPS) technology and field investigations. The changes of landscape structure and characteristics were analyzed and evaluated by adopting the aspects of "patch-corridor-matrix" pattern and landscape ecology index. The results show that: (1) The total areas of mangroves and Spartina alterniflora in Fujian grew rapidly from 1999 to 2018, the increased area of mangroves and Spartina alterniflora was 477.3 and 2 647.81 hm², respectively. The annual growth rate of mangroves and Spartina alterniflora were dropped significantly, the annual growth rate of Spartina alterniflora was greater than that of mangroves in the mangrove reserve. (2) The number of the big patches (≥20 hm²) was decreased by 3.39% between 1999 and 2018, while that of the small patches (<20 hm²) was increased by 18.03%. The degree of fragmentation of wetland landscape had increased and the instability of wetland landscape construction increased gradually during the past 20 years. (3) The proportions of based pattern in most main sea were decreased except for Sansha Bay, and the wetland landscape pattern tended to be heterogeneous (i. e., increased fragmentation and decreased aggregation of tidal flat). In the past 20 years, Spartina alterniflora occupied the dominant position in the northern sea of Fujian, and Spartina alterniflora competed with mangroves in southern sea of Fujian. Moreover, Spartina alterniflora had invaded the core areas of mangroves in nature reserve, and actions should be taken to clean it away. The research results can provide foundational data and theoretical support for mangrove protection and Spartina alterniflora management.

Key words: mangrove, Spartina alterniflora, dynamic change, remote sensing, Fujian

CLC Number:

X171.1

PAN Wei-hua, CHEN Jia-jin, WANG Yan. Analysis of Spatio-temporal Dynamical Change and Landscape Characteristics of Mangroves and Spartina alterniflora in Fujian Based on Satellite Imageries From 1999 to 2018[J]. Journal of Ecology and Rural Environment, 2020, 36(11): 1428-1436.

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Analysis of Spatio-temporal Dynamical Change and Landscape Characteristics of Mangroves and Spartina alterniflora in Fujian Based on Satellite Imageries From 1999 to 2018

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