Fig. 4From: Two new methods applied to crown width additive models: a case study for three tree species in Northeastern ChinaContribution of different covariates including tree size (HCB and THT) and competition (BA and BAL) to CR for larch, birch, and poplar. The curves were generated by using the average values of the covariates in Table 2, the parameters of NSURMEM systems in Table 4, and the equal intervals of the test covariates from the minimum to the maximum rangeBack to article page