Fig. 5From: Nitrogen uptake strategies of mature conifers in Northeastern China, illustrated by the 15N natural abundance methodContribution of DON, NH4+, and NO3− to plant N uptake in the four forest plantations calculated by the three end-member (a), and calculated according to the results of in situ labelling experiment in the previous study (b, Methods and Materials, Zhou et al. 2020).Back to article page