Linking Ecosystem Service Supply and Demand to Evaluate the Ecological Security in the Pearl River Delta Based on the Pressure-State-Response Model.

However, the change trends of ecological security showed a decreasing trend. 4.2.

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It showed an overall trend of increase, increasing from 0.140 in 1990 to 0.177 in 2015 ( Figure 3 ), indicating that the government and society are gradually increasing their awareness of ecosystem change and environmental quality.

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The first stage was from 1990 to 2000, where the status index showed a trend of rapid increase, and the average annual increase rate was 2.34%; the change was caused by the enhancement in the ecosystem service capacity such as carbon sequestration per unit area.

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The water yield showed an increasing trend from 41.8 billion m 3 in 1990 to 63.6 billion m 3 in 2015 ( Table 4 ).

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