Remote sensing monitoring of the spatio-temporal changes in pond aquaculture based on mixed pixel decomposition
SHENG Dezhi1,2,3(), XING Qianguo1,2,3(), LIU Hailong1,2,3, ZHENG Xiangyang1,2,3
1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China 2. Shandong Key Laboratory of Coastal Environmental Processes, Yantai 264003, China 3. University of Chinese Academy of Sciences, Beijing 100049, China
Aquaculture is an important way for humans to obtain food, and aquaculture ponds are a major production mode of aquaculture. The Pearl River Delta, as an important aquaculture base in southern China, has undergone great changes in its spatial distribution in the past 30 years. This study investigated Zhongshan City and its adjacent areas. First, the mixed pixels of Landsat and Sentinel-2 remote sensing data were decomposed using the linear mixed pixel decomposition method. Then, the NDWI threshold range corresponding to the water abundance of 70% and above was selected through visual comparison and analysis. Finally, the spatio-temporal distribution of typical aquaculture ponds from 1990 to 2021 was obtained. The study results show that the aquaculture ponds in Zhongshan City and its adjacent areas have experienced a process of first increasing and then decreasing since 1990. Specifically, the area of aquaculture ponds nearly doubled from 1990 to 2000, tended to be stable from 2000 to 2010, but decreased by nearly 50% from 2010 to 2021. This study can reduce the impact of mixed pixels on the monitoring of aquaculture ponds and support the scientific aquaculture and sustainable development of fisheries in the Greater Bay Area.
Yu X J, Xu L J, Wu F X, et al. China fishery statistical yearbook[M]. Beijing: China Agricultural Press, 2020:1-66.
[3]
Ren C, Wang Z, Zhang Y, et al. Rapid expansion of coastal aquaculture ponds in China from Landsat observations during 1984—2016[J]. International Journal of Applied Earth Observation and Geoinformation, 2019, 82:101902.
doi: 10.1016/j.jag.2019.101902
[4]
Orimoloye I R, Kalumba A M, Mazinyo S P, et al. Geospatial analysis of wetland dynamics:Wetland depletion and biodiversity conservation of Isimangaliso Wetland,South Africa[J]. Journal of King Saud University-Science, 2020, 32(1):90-96.
doi: 10.1016/j.jksus.2018.03.004
[5]
Hu W, Li G, Li Z. Spatial and temporal evolution characteristics of the water conservation function and its driving factors in regional lake wetlands:Two types of homogeneous lakes as examples[J]. Ecological Indicators, 2021, 130:108069.
doi: 10.1016/j.ecolind.2021.108069
[6]
Gallant K, Withey P, Risk D, et al. Measurement and economic valuation of carbon sequestration in Nova Scotian wetlands[J]. Ecological Economics, 2020, 171:106619.
doi: 10.1016/j.ecolecon.2020.106619
[7]
Liu X, Wang Y, Costanza R, et al. The value of China’s coastal wetlands and seawalls for storm protection[J]. Ecosystem Services, 2019, 36:100905.
doi: 10.1016/j.ecoser.2019.100905
Ding J H, Wen Y M. The effect of aquaculture in the dike-pond ecosystem on environment[J]. Research Trend of Resource Ecological Environment Network, 2001, 12(1):29-33.
[9]
Ma J, Niu X, Zhang D, et al. High levels of microplastic pollution in aquaculture water of fish ponds in the Pearl River Estuary of Guangzhou,China[J]. Science of the Total Environment, 2020, 744:140679.
doi: 10.1016/j.scitotenv.2020.140679
Cheng T F, Zhou W F, Fan W. Progress in the methods for extracting aquaculture areas from remote sensing data[J]. Remote Science for Land and Resources, 2012, 24(3):1-5.doi:10.6046 /gtzyyg.2012.03.01.
doi: 10.6046 /gtzyyg.2012.03.01
[11]
Pattanaik C, Prasad S N. Assessment of aquaculture impact on mangroves of Mahanadi delta (Orissa),east coast of India using remote sensing and GIS[J]. Ocean and Coastal Management, 2011, 54(11):789-795.
doi: 10.1016/j.ocecoaman.2011.07.013
Yao Y C, Ren C Y, Wang Z M, et al. Monitoring of salt ponds and aquaculture ponds in the coastal zone of China in 1985 and 2010[J]. Wetland Science, 2016, 14(6):874-882.
Xu H Q. A study on information extraction of water body with the modified normalized difference water index (MNDWI)[J]. Journal of Remote Sensing, 2005, 9(5):589-595.
Pei L, Wang J X, Qu H H, et al. Research on remote image extraction of coastal aquaculture pond based on ONDPI[J]. Hydrographic Surveying and Charting, 2020, 40(5):40-44.
[15]
Cheng B, Liang C, Liu X, et al. Research on a novel extraction method using deep learning based on GF-2 images for aquaculture areas[J]. International Journal of Remote Sensing, 2020, 41(9):3575-3591.
doi: 10.1080/01431161.2019.1706009
[16]
Duan Y, Tian B, Li X, et al. Tracking changes in aquaculture ponds on the China coast using 30 years of Landsat images[J]. International Journal of Applied Earth Observation and Geoinformation, 2021, 102:102383.
doi: 10.1016/j.jag.2021.102383
[17]
Ren C, Wang Z, Zhang B, et al. Remote monitoring of expansion of aquaculture ponds along coastal region of the Yellow River Delta from 1983 to 2015[J]. Chinese Geographical Science, 2018, 28(3):430-442.
doi: 10.1007/s11769-017-0926-2
Sun X Y, Su F Z, Zhou C H, et al. Analyses on spatial-temporal changes in aquaculture land in coastal areas of the Pearl River Estuarine[J]. Resources Science, 2010, 32 (1):71-77.
[19]
Chang Z Q, Neori A, He Y Y, et al. Development and current state of seawater shrimp farming,with an emphasis on integrated multi-trophic pond aquaculture farms,in China:A review[J]. Reviews in Aquaculture, 2020, 12(4):2544-2558.
doi: 10.1111/raq.12457
Chen F, Qiu Q Y, Xiong Y Z, et al. Pixel unmixing based on linear spectral mixture model:Methods and comparison[J]. Remote Sensing Information, 2010(4):22-28.
Lan J H, Zou J L, Hao Y S, et al. Research progress on unmixing of hyperspectral remote sensing imagery[J]. Journal of Remote Sensing, 2018, 22(1):13-27.
Li J, Wang A J, Li T J. Variations of coastal wetland landscapes in the Pearl River Delta in the last 20 years[J]. Advances in Marine Science, 2011, 29(2):170-178.
Lin M Z, Feng R G, Ji S T. Analysis on mode change and landscape pattern of the dike-pond agriculture in Zhongshan[J]. Agricultural Science of Guangdong, 2014, 41 (24):184-189.
[27]
Lian L, Chen J. Spatial-temporal change analysis of water area in Pearl River Delta based on remote sensing technology[J]. Procedia Environmental Sciences, 2011, 10:2170-2175.
doi: 10.1016/j.proenv.2011.09.340
Chen C X, Huang G Q, Ye Y Y, et al. Change and ecological restoration of the dike-pond system in the Pearl River Delta:A case study of four villages in Foshan City[J]. Resources Science, 2021, 43(2):328-340.