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王娟,刘红玉,李玉凤,刘伶,谢富赋.入侵种互花米草空间扩张模式识别与景观变化模拟.生态学报,2018,(15).http://dx.doi.org/10.5846/stxb201709121641  
入侵种互花米草空间扩张模式识别与景观变化模拟
Recognition of spatial expansion patterns of invasive Spartina alterniflora and simulation of the resulting landscape-changes
投稿时间:2017-09-12  修订日期:2018-03-12
DOI: 10.5846/stxb201709121641
关键词潮滩湿地  互花米草  植物入侵  空间扩张  模拟  核心区
Key Wordstidal flat wetland  Spartina alterniflora  plant invasion  spatial expansion  simulation  core area of YNNR
基金项目国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王娟 南京师范大学盐城师范学院 wangjjsyctu@163.com 
刘红玉 南京师范大学 liuhongyu@njnu.edu.cn 
李玉凤 南京师范大学  
刘伶 南京师范大学  
谢富赋 南京师范大学  
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摘要:
在3S技术支撑下,通过景观格局指数、质心变化等方法,分析2006—2015年研究区内互花米草群落的景观空间分布特征,并利用2015年高分二号影像识别出扩张模式及预测扩张趋势。结果表明:①近年来,互花米草沼泽向陆扩张速度大于向海扩张速度,其质心不断向陆方向移动。②2006—2015年,互花米草斑块密度变大,面积加权平均形状指数也相应增大为8.63,景观形状越来越复杂。③利用LEI和PFD识别出互花米草的3种扩张模式,边缘扩张面积远大于外部隔离扩张面积,外部隔离扩张斑块数量远多于边缘扩张和潮沟引领式扩张斑块数之和,潮沟对互花米草的向陆扩张起到引领作用。④利用缓冲区分析模拟互花米草向陆扩张的趋势,未来5年碱蓬沼泽的面积将减少11.45%。本研究可为进一步认识互花米草入侵碱蓬沼泽机制提供科学参考。
Abstract:
Using landscape pattern indexes and the methods of centroid position with the help of 3S technology, we examined the landscape characteristics of Spartina alterniflora and its spatial expansion patterns from 2006 to 2015, in the core area of the Yancheng National Nature Reserve (YNNR) in Jiangsu Province. Furthermore, we forecasted its expansion trends based on the GF-2 Satellite Image of 2015. Our results indicated the following: first, the recent landward expansion of the Spartina alterniflora marsh occurred at a faster speed than seaward expansion, its centroid continuously moving landward. Second, over the period from 2006 to 2015, patch density of Spartina alterniflora showed an increase. In addition, the landscape shape became more complex in the tidal flat wetland and the area weighted average shape index, correspondingly increased to 8.63. Third, three expansion patterns of Spartina alterniflora, marginal expansion (ME), external isolated expansion (EIE), and tidal creek-leading expansion (TCLE), were identified through the landscape expansion index and the patch fractal dimension. The patch areas of ME were larger than the external isolated expansion, while the patch number of EIE far exceeded the total number of ME and TCLE. Tidal creeks played a leading role in Spartina alterniflora expanding landward. Finally, based on the three expansion rates measured in our field investigation, the landward spreading trends of Spartina alterniflora marsh was simulated by using buffer analysis in ArcGIS10.2. Simulation results indicated that the area of Suaeda salsa will decrease by 11.45% in the next 5 years. The conclusions of this study will be helpful for understanding the invasive mechanism of Spartina alterniflora in the Suaeda salsa marsh.
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