为快速、客观、定量地评价长江岸线湖南段生态环境质量变化,以1990、2000、2010、2020年的Landsat遥感影像为数据源,采用遥感生态指数(RSEI)模型对该区的生态环境质量进行监测与评价。结果表明:1990、2000、2010、2020年的遥感生态指数...为快速、客观、定量地评价长江岸线湖南段生态环境质量变化,以1990、2000、2010、2020年的Landsat遥感影像为数据源,采用遥感生态指数(RSEI)模型对该区的生态环境质量进行监测与评价。结果表明:1990、2000、2010、2020年的遥感生态指数均值分别为0.6848、0.6729、0.5912、0.7786,呈现先降后升的变化趋势,但1990—2010年RSEI值的降低幅度小于2010—2020年RSEI值的增加幅度。1990—2020年长江岸线湖南段生态环境质量变好的区域面积最大,不变的区域面积次之,变差的区域面积最小,其面积占比分别为46.27%、27.04%和26.69%;生态环境质量等级变化以上升1、2个等级和下降1个等级的为主,且上升1、2个等级的区域面积之和比下降1个等级的区域面积增加了31.4055 km 2,区域面积占比增加了20.28%。从整体上看,1990—2020年长江岸线湖南段生态环境质量变化是一个渐变的过程,虽然在1990—2010年出现了生态退化现象,但2016年后随着生态保护政策的实施,生态环境质量得到了显著改善。展开更多
Seabirds are good candidates as ecological indicators, especially in under-studied ecosystems since they provide insights into marine ecosystem processes and functions at various trophic levels. Our review discusses s...Seabirds are good candidates as ecological indicators, especially in under-studied ecosystems since they provide insights into marine ecosystem processes and functions at various trophic levels. Our review discusses salient points on the present status of seabirds in the Bay of Bengal Large Marine Ecosystem;despite overall low seabird numbers and biomass, this region harbors 9 species of terns, one of the most threatened bird group worldwide, which are known to breed in various marine habitats of Andaman and Nicobar islands, in addition to the coastal areas of mainland. Further, we elaborate on employing seabirds as potential indicators of this ecosystem and how they outscore other taxa in this aspect. Finally, we argue that it is essentially to fill the gaps in our knowledge about the BOBLME, mainly about the interplay between seabirds, climate change and fisheries.展开更多
文摘为快速、客观、定量地评价长江岸线湖南段生态环境质量变化,以1990、2000、2010、2020年的Landsat遥感影像为数据源,采用遥感生态指数(RSEI)模型对该区的生态环境质量进行监测与评价。结果表明:1990、2000、2010、2020年的遥感生态指数均值分别为0.6848、0.6729、0.5912、0.7786,呈现先降后升的变化趋势,但1990—2010年RSEI值的降低幅度小于2010—2020年RSEI值的增加幅度。1990—2020年长江岸线湖南段生态环境质量变好的区域面积最大,不变的区域面积次之,变差的区域面积最小,其面积占比分别为46.27%、27.04%和26.69%;生态环境质量等级变化以上升1、2个等级和下降1个等级的为主,且上升1、2个等级的区域面积之和比下降1个等级的区域面积增加了31.4055 km 2,区域面积占比增加了20.28%。从整体上看,1990—2020年长江岸线湖南段生态环境质量变化是一个渐变的过程,虽然在1990—2010年出现了生态退化现象,但2016年后随着生态保护政策的实施,生态环境质量得到了显著改善。
文摘Seabirds are good candidates as ecological indicators, especially in under-studied ecosystems since they provide insights into marine ecosystem processes and functions at various trophic levels. Our review discusses salient points on the present status of seabirds in the Bay of Bengal Large Marine Ecosystem;despite overall low seabird numbers and biomass, this region harbors 9 species of terns, one of the most threatened bird group worldwide, which are known to breed in various marine habitats of Andaman and Nicobar islands, in addition to the coastal areas of mainland. Further, we elaborate on employing seabirds as potential indicators of this ecosystem and how they outscore other taxa in this aspect. Finally, we argue that it is essentially to fill the gaps in our knowledge about the BOBLME, mainly about the interplay between seabirds, climate change and fisheries.
