Allometric models for above-ground biomass, carbon and nutrient content of wild cherry (Prunus avium L.) trees in agroforestry systems

Table 2 Overview of the regression models describing total single-tree parameters. All regressions were modelled according to Eq. 3, with correction factors (CF) derived according to Eq. 4. In each model, the predictor is the logarithm of the DBH in centimetre. For each model, the response variable and its unit, the model coefficients, the CF, the R²_adj and the p-values of the model are reported

Response (\(\widehat{y}\))	Unit	Intercept (\({\beta }_{0}\))	Slope (\({\beta }_{1}\))	CF	R²_adj	p-value
Tree height	m	0.7421	0.4603	1.0150	0.8831	< 0.001
Crown base height	m	− 0.2801	0.2468	1.0368	0.4677	< 0.001
Crown diameter	m	− 1.2619	0.9772	1.0653	0.8887	< 0.001
Crown projection area	m²	− 1.7834	1.6680	1.1751	0.9013	< 0.001
Above-ground volume	m³	− 8.0157	2.2960	1.0502	0.9828	< 0.001
Above-ground biomass	kg	− 1.6740	2.2865	1.0517	0.9821	< 0.001
Above-ground carbon	kg	− 2.3786	2.2819	1.0527	0.9817	< 0.001
Above-ground Ca	kg	− 6.1680	2.1162	1.0890	0.9653	< 0.001
Above-ground K	kg	− 7.8585	2.1948	1.0688	0.9746	< 0.001
Above-ground Mg	kg	− 9.5174	2.2479	1.0627	0.9778	< 0.001
Above-ground N	kg	− 7.3125	2.1617	1.0759	0.9713	< 0.001
Above-ground P	kg	− 9.3780	2.1967	1.0711	0.9739	< 0.001

ISSN: 1297-966X