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通过1979年、1991年、2003年和2015年四期的遥感影像,研究1979-2015年间江苏中部滨海湿地的围垦及米草入侵的动态变化及二者影响下土地利用/覆被类型的演化过程。结果表明:1979-2015年,围垦和米草边界总体上不断向海推进,不同岸段推进速度存在差异。围垦面积持续加速增长,各段平均增速为3.43 km~2/yr,米草面积在1991-2003年间增速最快,各段平均增速0.89 km~2/yr,2002年以后增速下降,为-0.03 km~2/yr。芦苇滩涂和碱蓬滩涂转化为围垦的面积占围垦土地来源的比例持续下降,米草滩涂和光滩的这一比例持续上升,对米草滩涂的围垦主要位于方塘河口以北,对光滩的围垦主要位于方塘河口以南。芦苇滩涂、碱蓬滩涂和光滩对米草滩涂面积的贡献为:光滩>碱蓬滩涂>芦苇滩涂。研究区演化路径总体呈现光滩—盐生植被—围垦的方向,但存在缩短趋势;米草入侵挤占了本地盐生植被的扩张空间。
Based on the remote sensing images of 1979, 1991, 2003 and 2015, the dynamic changes of reclamation and seagrass invasion of coastal wetlands in central Jiangsu Province during 1979-2015 and the evolution of land use / cover types under the influence of both . The results show that from 1979 to 2015, the boundaries of reclamation and grassland are generally progressing towards the sea, and there are differences in the speed of propulsion between different banks. The reclamation area continued to increase at an accelerated pace, with an average growth rate of 3.43 km ~ 2 / yr in each segment. The area of rice grass grew most rapidly in 1991-2003 with an average growth rate of 0.89 km ~ 2 / yr in each segment. The growth rate declined after 2002 , Which is -0.03 km ~ 2 / yr. The proportions of reed beaches and cape bosnia that were converted into reclaimed land into reclamation land continued to drop. The proportion of m grass beach and light beach continued to rise. The reclamation of rice grass beach was mainly north of Fangtang estuary, Reclamation is mainly located south of Fangtang estuary. The contribution of reed beach, soda beach and light beach to the area of rice straw beach is: light beach> cape beach> reed beach. The evolutionary path of the study area generally shows the direction of Guangtan-halophyte-reclamation, but it tends to shorten. The invasion of rice grass occupies the expanding space of native halophyte.