21 , the grass yield in the Sanjiangyuan region showed a clear trend of decreasing from southeast to northwest from 1988 to 2005, which is basically consistent with the findings of this study.
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Analysis of spatial and temporal distribution of grassland yield under grassland ecological subsidy policy.
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Results and analysis Spatial characteristics and change analysis The grass production in the Sanjiangyuan region showed a decreasing trend from east to west from 2011 to 2016 (Fig. 1 ).