Contrasting foliar nitrogen nutrition of coexisting temperate and boreal trees across a modest temperature cline.

Foliar δ 15 N of Dahurian larch increased significantly toward the temperate forest ( P < 0.05) but it had marginally significant trend for Mongolian oak across the sampling transect ( P = 0.07; Fig. 3 d).

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However, the benefits from Mongolian oak were also likely offset in part by the impacts of MAP and MAT, as discussed above, resulting in a nonsignificant trend in foliar N concentration for Dahurian larch across the ecotone. 4.3 Interspecific differences of foliar 15 N abundance and Δδ 15 N across the temperate-boreal forest ecotone Mongolian oak and Dahurian larch had distinct patterns of foliar δ 15 N and Δδ 15 N across the ecotone ( Figs. 3 d, f), consistent with our second hypothesis.

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In contrast, Dahurian larch did not have a significant trend in foliar N concentration across the ecotone.

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