Differential responses of heterotrophic and autotrophic respiration to nitrogen addition and precipitation changes in a Tibetan alpine steppe.

Although the BGB was not significantly altered, we observed an increasing trend for N addition in 2016 in this study (17.01%; Fig. 2a,b ).

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Although the effects of N addition are not significant, a slight trend is observed in the first year wherein the addition of N increased Rs.

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By contrast, the precipitation regime led to marked changes in Rh, but exhibited marginally significant effects on Ra.

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Furthermore, we observed that soil temperature exhibited a decreasing trend with increasing N additions (Table 1 ).

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