2009-2018年互花米草对广西榕根山滩涂时空格局的影响

Effects of Spartina alterniflora on Temporal and Spatial Pattern of Ronggen Mountain Beach in Guangxi from 2009 to 2018

海草床是国家二级保护动物中国鲎栖息地和觅食场所,广西榕根山海草床的主要海草种类为贝克喜盐草,由于该区域海草床长期受到互花米草入侵威胁,利用卫星图片勾绘、结合卫星定位绕测,测量榕根山滩涂的各类植被斑块,分析了2009—2018年期间互花米草的斑块数量、面积和分布变化。结果表明:2009—2018年榕根山互花米草的面积由1.62 hm~2扩增至17.58 hm~2,占滩涂面积比例从1.07%上升至11.65%,质心以0.11 km/年的速度沿岸向西北移动,榕根山滩涂景观破碎化程度逐步提高,互花米草对海草床的演替正在进行,需通过人工干预清除互花米草以保护海草栖息地。

The seagrass bed is the habitat and foraging place of the Chinese Horseshoe Crab, a national second-class protected animal. The main seagrass species in the seagrass bed of Ronggen mountain in Guangxi is halophila Baker. The seagrass bed in this area has been threatened by Spartina alterniflora invasion for a long time. In this paper, various vegetation patches in Ronggen mountain tidal flat were measured by using satellite image sketching and satellite positioning, and the patch number, area and distribution changed of Spartina alterniflora from 2009 to 2018 were analyzed. From 2009to 2018, the area of Spartina alterniflora in Ronggen mountain increased from 1.62 hm~2to 17.58 hm~2, accounting for 11.65% of the tidal flat area, and the center of mass moved to the northwest at the speed of 0.11 km/a, The landscape fragmentation degree of Ronggen mountain beach was gradually increasing,and the succession of Spartina alterniflora to seagrass bed was under way, so it is necessary to carry out manual intervention to remove Spartina alterniflora as soon as possible to protect seagrass habitat.