Table 2 General means ± standard error (SE) for stem height (cm), circumference (mm), and biomass production at tree (g_DW) and plantation levels (Yield; t ha⁻¹ year⁻¹) for poplar and black locust at the two planting densities (SRC/SRF) (n = 400 and 800 individuals for poplar and black locust, respectively, in the SRC; n = 150 and 300 individuals for poplar and black locust, respectively, in the SRF). Differences between species, planting density, and their interaction are presented in Table 4. When data are available for SRC only, the differences between species are indicated: **P ≤ 0.01, ***P ≤ 0.001

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