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cje ›› 2009, Vol. 28 ›› Issue (12): 2437-2443.

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Landscape pattern change and its cumulative environmental effects of coastal wetlands in southern Laizhou Bay.

ZHANG Xu-liang1;ZHANG Zhao-hui2|XU Zong-jun2;GU Dong-qi2|ZHENG Wei2   

  1. 1Department of Geography, Qingdao University, Qingdao 266071, Shandong, China|2First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, Shandong, China
  • Online:2009-12-10 Published:2009-12-10

Abstract: Based on the classification of wetland landscape, and by using remote sensing and GIS techniques, the Landsat 5 and Landsat 7 false color TM images of coastal wetlands in southern Laizhou Bay in 1987 and 2002 were obtained, and the landscape pattern change and its cumulative environmental effects were studied with patch dynamic index, patch density index, landscape diversity index, and patch fragmental index. In 1987-2002, the total area of the wetlands in southern Laizhou Bay kept unchanged, but the natural wetland decreased by 491%. The disappeared natural wetland was converted into culture ponds and salt fields. The landscape diversity index decreased, while the patch fragmental index increased. Some cumulative environmental effects were induced by the landscape pattern change, e.g., the total net primary productivity of natural wetland decreased, the functions of natural wetland in purifying environment and defending marine disasters weakened, some mesophytes, xerophilous plants, and harmful plants invaded the coastal wetlands, and the ecosystem services value of the coastal wetlands declined.

Key words: Climbing plants, Vertical virescence, Hedera helix, Parthenocissus quinuefolia, Wisteria sinensis