中文摘要：

基于1987年、1997年和2005年3期TM遥感数据，对衡水湖的湿地景观空间格局及其演变进行分析，结果表明：该区域以农田为景观基质，水体和芦苇沼泽交错分布构成区域湿地生境的主体斑块，其余景观类型呈以小尺度斑块散布于区域中。保护区湿地景观改变较明显，湿地由1987年的20．2％上升到1997年的23．4％，2005年占到22．3％，农田向湿地类型的转变最为显著，农田和湿地类型之间的动态转换关系很大程度上决定了保护区土地利用结构和景观格局的演变。从景观类型水平来看，表现为水体的平均斑块面积增加，由1987年的3．5187hm^2减到1997年的2．0187hm^2到2005年为4．3997hm^2，破碎度指数下降；聚合度指数和最大斑块指数先降后升，而连接度指数先增后减；芦苇沼泽平均斑块面积下降明显，由1987年的2．6169hm^2降到1997年的0．5437hm^2，到2005年为0．3558hm^2，且形状日趋复杂自然，最大斑块指数和聚合度指数持续减少，而连接度指数的变化趋势则相反，但总体上芦苇沼泽沼泽小面积斑块数量仍占相当比例，破碎化程度仍维持较高水平。在景观整体水平上，保护区的景观多样性和均匀度指数呈缓慢上升趋势，破碎化指数由1987年的51．068增到1997年的74．0985后2005年减为37．88，以农田为景观基质的蔓延度指数则先降后升。景观格局分析表明，衡水湖保护区湿地面积逐步恢复，破碎化程度降低且景观日趋多样化，连通性虽不及1987年历史最高水平却呈加强趋势，湿地生境质量得到优化，2005年湿地恢复的景观格局的空间配置达到3个时期的历史最高水平，也体现了保护区规划管理取得一定成效。

英文摘要：

Based on multi-temporal remotely sensed TM images from 1987, 1997 and 2005, changes in the landscape pattern of Hengshui National Nature Reserve during 1987 - 2005 were quantitatively analyzed using landscape metrics and a transition matrix. The results showed that the Hengshui wetland landscape, which is dominated by farmland with a rich mosaic of water bodies and reed marsh, had changed visibly. The wetland area accounted for 20.2%, 23.4% and 22.3 % in the three phases, respectively, and the area of water bodies was reduced by 1.47 % while there was a 154.63 % increase in reed area. Due to agricultural policy adjustments such as the conversion of cropland to wetland, changes in land use in the reserve were largely driven by the transformation from cultivated land to wetland, which was the most notable change since the 1990s. With rapid urbanization and residential expansion since the late 1980s, the transformation from water body to residential area was increasingly obvious, which is a serious consideration for sustainable development of the reserve. The mean area of water bodies decreased from 3.52hm^2 to 2.02hm^2 from 1987 to 1997, but climbed to 4.40hm^2 in 2005, and the patch number （PN） was 1429, 2403 and 1181 accordingly. The patch density （PD） of water bodies declined, but the PD of reed marshes rose. The PN of reeds increased from 155 to 2644 and then to 2903 while the mean area was 2.62hm^2, 0.54hm^2 and 0.36hm^2 in 1987, 1997 and 2005. The Euclidean Nearest-Neighbor Distance （ENN） of the two first decreased and then began to rise, and the aggregation index （AI） of water bodies fell and then rose, while the AI of reeds declined for both periods. At the landscape level, landscape Shannon diversity and evenness indices went up slowly, PD first rose from 51. 068 to 74. 0985 then dropped to 37.88 over the three stages, and contagion index fell and then recovered while the connection index was the reverse. The analysis demonstrates that the area of wetland was gradually restored, and the deg