Policy-driven opposite changes of coastal aquaculture ponds between China and Vietnam: Evidence from Sentinel-1 images
Policy-driven opposite changes of coastal aquaculture ponds between China and Vietnam: Evidence from Sentinel-1 images
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DOI：
10.1016/j.aquaculture.2023.739474
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发表时间：
2023-03
期刊：
影响因子：
4.5
通讯作者：
Zhe Sun;Juhua Luo;Xiaohong Gu;Tianci Qi;Q. Xiao;Ming Shen;Jinge Ma;Qingfei Zeng;H. Duan-
中科院分区：
文献类型：
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作者：
Zhe Sun;Juhua Luo;Xiaohong Gu;Tianci Qi;Q. Xiao;Ming Shen;Jinge Ma;Qingfei Zeng;H. Duan-
沿海水产养殖池塘（CAPs）对粮食安全、生态系统健康和温室气体排放至关重要。然而，现有数据往往缺乏国家和国际尺度空间数据的地理信息。卫星遥感使大规模的CAP监测更加有效。在使用合成孔径雷达（SAR）数据时尤其如此，因为SAR数据可以提供全天采集，作为大规模CAP测绘的高质量数据源。本研究以中国和越南的CAPs为研究对象，提出了一种利用Sentinel-1卫星影像进行大规模CAPs制图的新方法。此外，高分辨率（10米）CAP数据集在2015年和2020年，时空变化和驱动因素进行了分析。主要结果如下：（1）所提出的映射方法的总体准确率> 90%。(2)于二零二零年，中国的CAP面积为8774. 93平方公里（69. 43%），越南的CAP面积为3864. 10平方公里（30. 57%）。(3)CAPs在中国和越南表现出相反的趋势。中国的CAP面积减少了891.29 km 2，变化率约为-9.22%，而越南的CAP面积增加了920.35 km 2，变化率约为31.26%。中国为改善生态环境作出了前所未有的生态友好努力，限制扩张。越南更注重增产，而不是环保，导致了显著的扩张。我们的研究结果为卫星遥感及其在沿海生态环境管理中的应用提供了一些新的见解，并有助于实现可持续发展目标2，6和14。
Coastal aquaculture ponds (CAPs) are of great importance for food security, ecosystem health, and greenhouse emissions. However, existing data often lacks geographic information on both national and international scale spatial data. Satellite remote sensing makes large-scale monitoring of CAPs more efficient. This is especially true when using synthetic aperture radar (SAR) data, which can provide all-day acquisition as a high-quality data source for large-scale CAP mapping. In this study, focusing on CAPs in China and Vietnam, a novel method of large-scale CAPs mapping using Sentinel-1 images was developed. Moreover, high-resolution (10 m) CAP datasets in 2015 and 2020 were produced, and spatiotemporal changes and drivers were analyzed. The key results are as follows: (1) the overall accuracy of the mapping method proposed was >90%. (2) In 2020, CAP area in China was 8774.93 km2(69.43%) and it was 3864.10 km2(30.57%) in Vietnam. (3) CAPs showed an opposite trend in China and Vietnam. The CAP area decreased by 891.29 km2with a change rate of about −9.22% in China, while the CAP area increased by 920.35 km2with a change rate of about 31.26% in Vietnam. China had made unprecedented ecofriendly efforts to restrict expansion for improving the ecological environment. Vietnam focused more on increasing production than on environmental protection, leading to significant expansion. Our results offer some new insights on satellite remote sensing and its use in coastal eco-environmental management and contribute to Sustainable Development Goals 2, 6 and 14.