Dynamic monitoring of ecological environment quality of Hainan Island based on improved remote sensing ecological index
In order to quantitatively analyze the quality of Hainan Island's ecological environment, besides the remote sensing ecological index(RSEI) that coupled with four indicators of greenness, humidity, dryness, and heat, we should consider the impact of land use intensity, population concentration...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | ZH |
| Publicado: |
Agro-Environmental Protection Institute, Ministry of Agriculture
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/3af1a3f234bf4b68a9d8bd226d7516b7 |
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| Sumario: | In order to quantitatively analyze the quality of Hainan Island's ecological environment, besides the remote sensing ecological index(RSEI) that coupled with four indicators of greenness, humidity, dryness, and heat, we should consider the impact of land use intensity, population concentration and slope on the island's ecosystem. Therefore, three other indicators of land use, population distribution, and topography were added, and the improved remote sensing ecological index(IRSEI) was constructed using principal component analysis. This study used RSEI and IRSEI to dynamically monitor the ecological environment quality of Hainan Island from 2000 to 2020 and analyzed the rationality of IRSEI and the similarity between RSEI/IRSEI and the ecological index(EI). The results showed that compared with RSEI, IRSEI was closer to the EI index and had good rationality. It can highlight the impact of land use, population distribution and topography on the quality of the ecological environment. Therefore, it can accurately and objectively evaluate the quality of Hainan Island's ecological environment. From 2000 to 2020, the quality of Hainan Island's ecological environment showed a trend of "decrease-rise-decline". The average value of IRSEI rose from 0.721 to 0.766, which shows that the quality of the ecological environment of Hainan Island has been improved. The proportion of land with excellent and good ecological environment quality levels in each year was more than 89%, and the proportion of land with worse and worst ecological environmental quality levels was so small that the sum of the two accounts for the proportion of each year were below 1.48%. The quality of the ecological environment in the central and southern parts of Hainan Island was higher than that of the eastern, northern and around island areas. The quality of the ecological environment was good in generally. The area covered by the improved ecological environment quality was 12 278.00 km2 that accounting for 47.5%, and the area covered by the reduced ecological environment quality was 3 124.07 km2 that accounting for 12.1%. The improved area was mainly distributed in the northern and eastern parts of Hainan Island, and the degraded region was mainly distributed in densely populated coastal cities around the island. The results can provide references for the future plan to improve eclogical environment in Hainan Island. |
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