During the four periods of 1987–1993, 1993–1999, 1999–2005 and 2005–2011, the ESV of forest areas showed a decreasing trend.
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Assessing spatio-temporal patterns and driving force of ecosystem service value in the main urban area of Guangzhou.
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The sentences
The largest percentage was 21.05% between 1987 and 1993, while from 2011 to 2017 the ESV of forest showed an increasing trend.