Spatiotemporal Variation of Natural Wetlands From 1990 to 2020, the natural wetland area in the Northeast Plain of China showed a decreasing trend followed by an increasing trend, with a turning point in 2005 ( Figure 5 ).
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Driving Force Analysis of Natural Wetland in Northeast Plain Based on SSA-XGBoost Model.
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Following these, DRL exhibited a notable trend, particularly from 2005 to 2010, with a conversion area reaching 1.57 × 10 4 km 2 .
On the basis of the land use transfer trajectory, it is evident that over the 15 years of continuous decline in NAW areas, there was a pronounced trend of strong conversion out.
The results showed that the total area of natural wetlands in the Northeast Plain of China increased by 32% from 1990 to 2020, mainly showing a first decline and then an increasing trend.