Expansion and Management Implications of Invasive Alien Spartina alterniflora in Yancheng Salt Marshes, China  

作　　者：Chunyue Liu Hongxing Jiang Shuqing Zhang Chunrong Li Xin Pan Jun Lu Yunqiu Hou Chunyue Liu;Hongxing Jiang;Shuqing Zhang;Chunrong Li;Xin Pan;Jun Lu;Yunqiu Hou(Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China;Research Institute of Forest Ecology, Environment and Protection, Key Laboratory of Forest Protection of State Forestry Administration, Chinese Academy of Forestry, Beijing, China;Yancheng National Nature Reserve, Xinyanggang, Sheyang County, Jiangsu, China;School of Electrical & Information Technology, Changchun Institute of Technology, Changchun, China)

机构地区：[1]Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China [2]Research Institute of Forest Ecology, Environment and Protection, Key Laboratory of Forest Protection of State Forestry Administration, Chinese Academy of Forestry, Beijing, China [3]Yancheng National Nature Reserve, Xinyanggang, Sheyang County, Jiangsu, China [4]School of Electrical & Information Technology, Changchun Institute of Technology, Changchun, China

出　　处：《Open Journal of Ecology》2016年第3期113-128,共16页生态学期刊（英文）

摘　　要：Improved understanding of the spatial dynamics of invasive plant species is critical for effective land management and control of future invasion. The Yancheng National Nature Reserve (YNNR), an internationally important wetland, has the largest distribution of alien Spartina alterniflora in China. This alien plant was intentionally introduced for erosion prevention and dike protection in China. However, it became an aggressive competitor with native salt marsh plants in the coastal regions in China. High resolution imagery, SPOT-5, was used to map plant communities including invasive species in the south core zone of YNNR with the natural ecosystem of salt marshes in 2003, 2005 and 2008. The fuzzy set assessment method significantly improved the classification accuracies over the conventional error matrix, i.e., from 73.8%, 73.5% and 81.4% to 91.5%, 91.6% and 93.4% in 2003, 2005 and 2008, respectively. It shows a great potential for mapping invasive plant species. Phragmites australis and S. alterniflora were the most accurately mapped classes, and sparse and dense Suaeda glauca were the least accurately mapped. From 2003 to 2008, S. alterniflora increased 28.8% from 1664.1 to 2142.6 ha in area size, and more than 2.5 times from 742 to 2608 patches. The highest increase in patch number occurred within the interval between 2001 and 3000 m from the eastern baseline. This increase was dominated by small patches with area less than 200 m². During the study period, the mean spread width was 405 ± 80.7 m in the original large patch of area over 200 ha. The eastward/seaward spread was distinctively larger than the westward/landward. The results enhance the understanding of alien plant’s invasion patterns and help improve conservation efforts.Improved understanding of the spatial dynamics of invasive plant species is critical for effective land management and control of future invasion. The Yancheng National Nature Reserve (YNNR), an internationally important wetland, has the largest distribution of alien Spartina alterniflora in China. This alien plant was intentionally introduced for erosion prevention and dike protection in China. However, it became an aggressive competitor with native salt marsh plants in the coastal regions in China. High resolution imagery, SPOT-5, was used to map plant communities including invasive species in the south core zone of YNNR with the natural ecosystem of salt marshes in 2003, 2005 and 2008. The fuzzy set assessment method significantly improved the classification accuracies over the conventional error matrix, i.e., from 73.8%, 73.5% and 81.4% to 91.5%, 91.6% and 93.4% in 2003, 2005 and 2008, respectively. It shows a great potential for mapping invasive plant species. Phragmites australis and S. alterniflora were the most accurately mapped classes, and sparse and dense Suaeda glauca were the least accurately mapped. From 2003 to 2008, S. alterniflora increased 28.8% from 1664.1 to 2142.6 ha in area size, and more than 2.5 times from 742 to 2608 patches. The highest increase in patch number occurred within the interval between 2001 and 3000 m from the eastern baseline. This increase was dominated by small patches with area less than 200 m². During the study period, the mean spread width was 405 ± 80.7 m in the original large patch of area over 200 ha. The eastward/seaward spread was distinctively larger than the westward/landward. The results enhance the understanding of alien plant’s invasion patterns and help improve conservation efforts.

关 键 词：Spartina alterniflora SPOT-5 Remote Sensing Fuzzy Set Assessment Expansion Characteristics Management Implications 

分 类 号：S45[农业科学—植物保护]