摘要
本文借助遥感和地理信息系统技术,运用景观生态学方法,采用反映湿地景观格局的面积、面积加权平均斑块分形、香农多样性、香农均度、蔓延度、比面积、面积加权平均形状因子等指数,应用FRAGSTATS3.3软件,分析长江南京段湿地景观格局指标变化情况,从而揭示出该研究区的湿地景观格局的动态演变,结果表明:长江南京段湿地景观总面积数量减少了6.75%,斑块数量增加了4%;斑块分形指数由1.1540增加到1.1638,景观破碎化程度加大;水田、江心洲以及河漫滩景观不规则化加大;自然河流和人工渠形状趋于规则化;坑塘的形状基本没变;坑塘、江心洲、人工渠占总湿地景观的比重上升;水田、自然河流、河漫滩的比重减少。近年以来,长江南京段湿地受政策及经济发展因素影响越来越明显,其变化的速度和力度比以往时期都有较大不同,人类活动作为一种干扰因子,逐渐成为影响湿地生态系统的主要力量。
Based on the remote sensing and geographical information system, using the method of landscape ecology, adopting such indexes as TA, AWMPFD, SHDI, SHEI, CONTAG, CA, % LAND and AWMSI, this paper systematically analyzed the dynamic change of the wetland landscape pattern in the study area. The result shown that the total area of the wetland landscape along Yangtze River in Nanjing reduced by 6.75% .The amount of the patch increased by 4% and the AWMPFD rose from 1. 1540 to 1. 1638. The degree of fragmentation is aggravated;SHDI, SHEI reduced slightly and CONTAG rose to some extent. The integrity and continuity of the wetland landscape are surely improved. The AWMSI of the paddy field, alluvion and flood land showed an increase tendency. The AWMSI of Natural River and artificial aqueduct showed a decrease tendency. The shape tended towards regularization. The AWMSI of the pond did not have a heavy change. The proportion of pond, alluvion and artificial aqueduct increased. Alluvion is relatively independent and slightly disturbed by human activities. The proportion of paddy field, natural river and flood land decreased. Studies shown the wetlands along Yangtze River in Nanjing are facing human disturbance and its ecosystem has been deteriorating.
出处
《资源科学》
CSSCI
CSCD
北大核心
2006年第5期24-29,共6页
Resources Science
基金
中国科学院知识创新项目(编号:KZCX3-SW-331)
关键词
湿地
动态演变
长江
南京
Wetland
Dynamic change
Yangtze River
Nanjing
