摘要
近岸区域水产养殖的无序化和集约化扩张会引起一系列水环境问题。利用2015年覆盖越南东部近岸区域的无云或少云的Landsat 8 OLI影像18景,采用面向对象与决策树相结合的分类方法,生产了研究区水产养殖塘空间分布数据;再利用近海水体中叶绿素a质量浓度数据,分析越南东部近岸区域水产养殖塘对近海水体中叶绿素a质量浓度的影响。研究结果表明,2015年,越南东部近岸区域水产养殖塘呈现南北多、中间少的空间分布格局,水产养殖塘总面积为8 947.29 km^2;其中,湄公河三角洲的水产养殖塘面积最大,其约占总面积的84.93%;水产养殖塘面积与近海水体中的叶绿素a质量浓度显著正相关,而且水产养殖塘面积与距离海岸线80 km范围内近海水体中的叶绿素a质量浓度关系更密切;近岸区域水产养殖塘面积对近海水体中的叶绿素a质量浓度的影响有季节差异,整体上,春季和秋季其对近海水体中的叶绿素a质量浓度的影响较大。
Rapid expansion of aquaculture ponds in offshore areas has caused a series of environmental problems. The 18 images from Landsat 8 OLI with cloudless or few cloudless covering the offshore areas in east Vietnam were collected in 2015. Then, a classification method combining object-oriented and decision trees was used to map aquaculture ponds in the study area. The relationship between area of aquaculture ponds and Chlorophyll-a concentration in the coastal water was explored. The results showed that the total area of coastal aquaculture ponds in offshore area in east Vietnam was 8 947.29 km^2 and coastal aquaculture ponds presented a non-even spatial pattern with more north and south and less middle. In all regions, the area of aquaculture ponds was the largest in Mekong River Delta, accounting for about 84.93% of the total area. It indicated that the area of aquaculture ponds was significantly positively correlated with the concentration of chlorophyll-a in offshore waters. The correlation between the area of aquaculture ponds and the chlorophyll-a concentration in the coastal water within 80 km from coastline was closer. Moreover, correlation coefficients varied with the months. Overall, the area of aquaculture ponds in offshore area had a greater impact on the chlorophyll-a concentration in the coastal water in spring and autumn, especially in October.
作者
孙喆
罗菊花
杨井志成
马荣华
张丽
薛坤
SUN Zhe;LUO Juhua;YANG Jingzhicheng;MA Ronghua;ZHANG Li;XUE Kun(Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China;Key Laboratory,of Digital Earth,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100094,P.R.China)
出处
《湿地科学》
CSCD
北大核心
2020年第2期207-218,共12页
Wetland Science
基金
中国科学院战略性先导科技专项(A类)项目(XDA19030302)
国家重点研发项目(2016YFC0500201-05)资助。