【摘要】 城市湿地具有水源涵养、环境净化、气候调节、生物多样性保护、教育科普等生态服务功能,是城市功能评价的重要指标。利用景观格局指数分析方法,选取5个景观指数对1955年、1972年、1990年、2007年四个时期建成区、近郊、远郊的湿地景观格局进行对比分析.结果表明:(1)长沙市城市湿地分布空间梯度较大;(2)在1955年至1972年间,湿地面积增长率大于建成区面积增长率,湿地在这段时间内呈现正向增长,在1972年至2007年建成区面积增长率都大于湿地面积增长率,湿地在建成区上呈现出退化现象;(3)1972年与1990年长沙市城市湿地的景观格局指数在建成区、近郊区和远郊区上的变化趋势相同。将景观格局指数和梯度分析相结合,能够较全面地反映城市景观格局与结构的变化特点。更多还原

【Abstract】 Urban wetland has the ecological functions such as water conservation,environmental purification,climate regulation,biodiversity protection,education and science popularization,is an important index of the city function evaluation.Through using landscape metrics method,the five landscape indexes of the wetland landscape pattern in built up area,suburban,outer suburbs in the four periods in 1955,1972,1990,2007 were analyzed.The results show that(1)it was not uniform of wetland distribution in Changsha city;(2) the wetland area growth rate was greater than the growth rate of the built-up area and wetland from 1955 to 1972,built area growth rate was greater than the growth rate of the wetland in the wetland area and built area showed a degradation phenomenon from 1972 to 2007;(3) changes in wetland landscape pattern index of built up area,suburb and the outer suburbs in Changsha city showed the same trend from 1972 to 1990.The gradient analysis combined with landscape pattern indices can quite completely reflects characteristics of the changes in urban landscape pattern and structure.更多还原