Spatial Configuration Trends in Coastal Louisiana from 1985 to 2010
Spatial Configuration Trends in Coastal Louisiana from 1985 to 2010
复制标题
1985年至2010年路易斯安那州沿海地区空间配置趋势
DOI：
10.1007/s13157-016-0744-9
复制
发表时间：
2016
期刊：
影响因子：
2
通讯作者：
William J. Sleavin
中科院分区：
文献类型：
--
作者：
Brady Couvillion;Michelle R. Fischer;Holly J. Beck;William J. Sleavin
从1932年到2010年，路易斯安那州沿海地区的湿地净减少了4877平方公里。随着这些湿地面积的变化，景观的空间结构也发生了变化。由此产生的景观是一个马赛克的补丁湿地和开放的水域。本研究探讨了空间和时间的变化轨迹的景观配置和这些模式的关系，在1985-2010年的观测期内的湿地土地变化的轨迹。利用多时相卫星图像和聚合指数（AI）的空间配置进行量化。分析结果表明，路易斯安那州沿海湿地的人工智能下降了1.07%。森林湿地和淡水沼泽类型的聚集性和稳定性最高。其余的沼泽类型，（中间，半咸水，和盐水）都经历了解体的时间段内，随着解体的严重程度沿着增加盐度梯度。最后，相关性（r2 = 0.5562）之间的AI和土地变化率为随后的时期，表明碎片化可以增加湿地的脆弱性，进一步湿地损失。这些结果可以帮助确定哪些沿海地区容易受到未来湿地损失。
From 1932 to 2010, coastal Louisiana has experienced a net loss of 4877 km2 of wetlands. As the area of these wetlands has changed, so too has the spatial configuration of the landscape. The resulting landscape is a mosaic of patches of wetlands and open water. This study examined the spatial and temporal variability of trajectories of landscape configuration and the relation of those patterns to the trajectories of land change in wetlands during a 1985–2010 observation period. Spatial configuration was quantified using multi-temporal satellite imagery and an aggregation index (AI). The results of this analysis indicate that coastal Louisiana experienced a reduction in the AI of coastal wetlands of 1.07 %. In general, forested wetland and fresh marsh types displayed the highest aggregation and stability. The remaining marsh types, (intermediate, brackish, and saline) all experienced disaggregation during the time period, with increasing severity of disaggregation along an increasing salinity gradient. Finally, a correlation (r2 = 0.5562) was found between AI and the land change rate for the subsequent period, indicating that fragmentation can increase the vulnerability of wetlands to further wetland loss. These results can help identify coastal areas which are susceptible to future wetland loss.