Spatially, more than half of the vegetation NEP (60.61%) in NXJ showed an increasing trend, 5.46% and 41.01% of the area showed a significant or extremely significant increasing trend.
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Spatio-Temporal Development of Vegetation Carbon Sinks and Sources in the Arid Region of Northwest China.
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Spatially, NXJ’ NEP showed a decreasing trend (−0.73 gC m −2 yr −1 ), whereas the vegetation NEP in SXJ and HX showed an increasing trend, with rates rising by 0.60 and 0.13 gC m −2 yr −1 , respectively ( Figure 3 b).
The vegetation NEP in the mountain exhibited only intermittent changes (2.55 gC m −2 yr −1 ) during 2000–2020; it exhibited a negative trend during 2000–2010, but this trend has reversed strongly since 2010.
The vegetation NEP in the plains exhibited a positive trend (1.21 gC m −2 yr −1 ) during 2000–2020, but this speed has slowed since 2010.