Journal of Tropical Oceanography ›› 2024, Vol. 43 ›› Issue (4): 165-173.doi: 10.11978/2023103CSTR: 32234.14.2023103

• Exploitation of Marine Resources • Previous Articles     Next Articles

Mangrove wetland dynamics in Shankou, Guangxi based on LUCC and landscape pattern change

ZHENG Fa(), HUANG Fulin, CHEN Zeheng, DING Weipin()   

  1. Haikou Geological Survey of Marine Center, China Geological Survey, Haikou 571127, China
  • Received:2023-07-28 Revised:2023-08-25 Online:2024-07-10 Published:2024-07-22
  • Supported by:
    China Geological Survey(DD20220876); National Natural Science Foundation of China(42261064)

Abstract:

In this study, based on the field survey data of the Guangxi Shankou National Mangrove Ecological and Natural Reserve (hereinafter referred to as the Shankou Mangrove Reserve) in 2022, six time-phase remote sensing images during 1987—2021 were selected, and an object-oriented image classification method was used to analyze the status of the land-use and land-cover change (LUCC) and to calculate the landscape pattern index (LPI) based on the LUCC. This study combined LPI with LUCC to focus on exploring the wetland change process and its important influencing factors in the Guangxi Shankou Mangrove Reserve. There has been a continuous transition between land types over the past 35 years, including cultivated land continued to decrease, and Spartina alterniflora and aquaculture ponds increased, with Spartina alterniflora mainly encroaching on the former coastal mudflats, and aquaculture ponds mainly converted from forested land and cultivated land. In terms of landscape, landscape fragmentation increased, connectivity decreased, landscape shape became more complex, and landform succession became more frequent; Based on Pearson's correlation analysis, there were highly significant or significant correlations between land use change and landscape indices for coastal mudflats, mizuna mudflats, and aquaculture ponds. Significant land use changes have occurred in the Shankou Mangrove Reserve over the past 35 years, with invasive species (Spartina alterniflora) and anthropogenic disturbances (aquaculture ponds) being the main factors influencing changes in mangrove wetlands in the area, and the main contributors to the continued increase in landscape fragmentation. This study reveals the influencing factors of regional landscape changes, which can provide a theoretical basis for the environmental management and protection of typical mangrove ecosystems.

Key words: mangrove wetland, LUCC, landscape pattern, anthropogenic disturbance, species invasion