盐城海岸带生态系统服务价值时空分异

为了解盐城海岸带生态系统服务价值（ESV）的时空变异规律，基于格网尺度对盐城海岸带1997，2007和2014年3个时期的ESV进行了估算，并结合空间自相关分析探讨研究区ESV时空分异规律。结果表明:近20 a来盐城海岸带生态系统服务价值总量呈不断减少的趋势，由1997年的134.33亿元减少至2014年的97.13亿元，自然湿地芦苇Phragmites australis沼泽、碱蓬Suaeda salsa沼泽、河流面积的减少是引起生态系统服务价值变化的主要原因。研究期间ESV在空间上发生了显著变化。ESV高区（ESV指数V_ESK > 7 463.04万元）的面积和空间分布显著减少，ESV较低区（796.67万元 ESK≤3 014.78万元）的面积和空间分布表现出逐渐扩大的格局。自相关分析表明:ESV具有显著的正相关关系，呈集聚分布特征且总体上呈不断下降趋势。研究区1997-2014年敏感性指数均小于1，表明研究结果具有可信性。在未来生态系统修复和管理中要权衡与协同不同生态系统类型之间的相互关系，加大对芦苇沼泽、碱蓬沼泽、河流等天然湿地的保护，合理规划滩涂湿地的利用方式，实现沿海湿地系统的可持续发展与利用。

Spatio-temporal variation of ecosystem services value in Yancheng coastal zone

Estimating the value of ecosystem services in coastal wetlands could provide important information for the protection and restoration of wetland ecosystems and decision-making. To reveal the spatio-temporal variation of ecosystem services value (ESV), the Yancheng coastal zone, a fragile region with a high intensity of reclamation activities, was taken as the research area, the thematic map (TM) and enhanced thematic map (ETM) remote sensing images of 1997, 2007, and 2014 were processed to obtain landscape type information. The ESV of the three periods was estimated by a grid unit in the study region and explored through spatial and temporal scales. Results showed that the total value of the ESV in Yancheng coastal zone decreased from 13.433 billion Yuan in 1997 to 9.713 billion Yuan in 2014 with the main reason being the decrease of Phragmites australis marshes, Suaeda salsa marshes, and river area in natural wetlands. ESV also changed significantly in space. The area and spatial distribution of the highest ESV decreased significantly, and the spatial distribution and area of the lower ESV increased gradually. The spatial autocorrelation index showed that ESV had a significant positive correlation and spatial connection which showed a downward curve on the whole. The sensitivity index of the research area was less than 1 from 1997 to 2014 which showed that the results of ESV estimation were credible. Thus, the trade-offs and synergies among different ecosystem services in coastal zones should be explored with more attention being paid to protection of natural wetlands, such as P. australis marshes, S. salsa marshes, and rivers, in future ecosystem restoration and management and with wetlands being rationally planned to realize the sustainable development and utilization of the coastal wetland system.