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Fig. 4 | Annals of Forest Science

Fig. 4

From: Early effects of two planting densities on growth dynamics and water-use efficiency in Robinia pseudoacacia (L.) and Populus deltoides (Bartr. ex Marsh.) × P. nigra (L.) short rotation plantations

Fig. 4

Distribution of the variables in the main factorial plane F1 × F2 of the principal component analysis (PCA) for the black locust trees under SRC (left) and SRF (right) conditions during the 2010 growing season. The numbers (in %) next to each axis represent the variance explained by the respective principal components. Abbreviations: SRC, short rotation coppice; SRF, short rotation forestry; Circ., stem circumference; Ht, stem height; dHt/dt, stem height increase rate; dnl/dt, leaf increment rate; LA, individual leaf area; SLA, specific leaf area; Nleaf, leaf nitrogen content; Cleaf, leaf carbon content; Δ13C, carbon isotope discrimination; Nstem, stem nitrogen content; Cstem, stem carbon content.

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Annals of Forest Science

ISSN: 1297-966X