Population Structure and Spatial Distribution Pattern of <i>Populus euphratica</i> Riparian Forest Under Environmental Heterogeneity Along the Tarim River, Northwest China.

euphratica population age structure follows a pyramid structure with an increasing trend ( Han et al., 2013 , 2014 , 2017 ), while in the middle and lower reaches, the population structure exhibits an inverted pyramid shape, with a declining trend ( Xu et al., 2016 ; Zhou et al., 2018 ).

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The average GD and SM values exhibit a decreasing trend from the upper to lower reaches ( Figure 7 ).

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