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Science Direct

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Sử dụng kỹ thuật viễn thám và hệ thông tin địa lý để nghiên cứu hiện trạng và những thay đổi của rừng ngập mặn ở Trà Vinh trong giai đọan 1965-2001. Nguyên nhân chính gây ra sự suy giảm rừng ngập mặn là do chiến tranh, phá rừng lấy củi, phá rừng làm ruộng hoặc nuôi tôm | Available online atwww.sciencedirect.com ScienceDirect ELSEVIER Estuarine Coastal and Shelf Science 71 2007 98 109 ESTUARINE COASTAL AND SHELF SCIENCE www.elsevier.com locate ecss Status and changes of mangrove forest in Mekong Delta Case study in Tra Vinh Vietnam Phan Minh Thu a Jacques Populus b a Institute of Oceanography 01 Cau Da Nha Trang Khanh Hoa Vietnam b IFREMER Centre de Brest Technopole Brest-Iroise BP 70 29280 Plouzane France Received 9 August 2006 accepted 10 August 2006 Available online 28 September 2006 Abstract Because shrimp culture in the Mekong Delta develops rapidly it has negatively impacted the environment socio-economics and natural resources. In particular mangrove forests have been altered by the shrimp culture. The area of mangrove forests in the region has been reduced and this is seen especially in Tra Vinh province. The results obtained from GIS Geography Information System and RS Remote Sensing show the status of mangrove forests in Tra Vinh province in 1965 1995 Northeastern part of Tra Vinh Province and 2001. In 1965 the area of mangrove forests was 21 221 ha making up 56 of total land-use while in 2001 it was 12 797 ha making up 37 of total land-use. Also based on GIS analysis over the 36 years 1965 2001 the total coverage of mangrove forests have decreased by 50 since 1965. However the speed of mangrove forest destruction in the period from 1965 to 1995 was much less than that in the period from 1995 to 2001. The average annual reduction in mangrove forest coverage in the first period 1965 1995 was 0.2 whereas it was 13.1 in the later period 1995 2001 . For the long time mangrove deforestation has been caused by war collection of firewood and clearing for agriculture and recently shrimp farming has significantly contributed rate of mangrove destruction. 2006 Elsevier Ltd. All rights reserved. Keywords mangrove forest GIS remote sensing Mekong mangrove changes mangrove management 1. Introduction Tropical mangrove forest ecosystems