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Ciencia e investigación agraria

versión On-line ISSN 0718-1620

Resumen

BOWN, Horacio E; MASON, Euan G; WATT, Michael S  y  CLINTON, Peter W. A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model. Cienc. Inv. Agr. [online]. 2013, vol.40, n.2, pp.361-374. ISSN 0718-1620.  http://dx.doi.org/10.4067/S0718-16202013000200011.

H.E. Bown, E.G. Mason, M.S. Watt, and P.W. Clinton. 2013. A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model. Cien. Inv. Agr. 40(2): 361-374. The 3-PG (Physiological Principles in Predicting Growth) radiation-use efficiency model has been widely used and tested for predicting the primary productivity of forests all over the world. This radiation-use efficiency model accounts for plant nutrition through a user-defined dimensionless fertility parameter (fN) that determines the effects a unit of radiation. Currently, this fertility parameter has to be entered by the user based on intuition or experience. The goal of this study was to propose a fertility modifier fN) for the radiation-use efficiency family of models based on soil chemical and physical variables. We determined gross- and net-primary productivity for a set of 10 intensively measured mini-plots of Pinus radiata D. Don on the South Island of New Zealand and then fitted a fertility modifier, fN, to the set of plots using a simplified radiation-use efficiency model. Fitted fN values were correlated to soil physical and chemical variables. The nutritional modifier, fN, significantly increased with the soil N (%) and decreased with the soil C:N ratio, and both, soil N and the C:N ratio, were measured in the upper 10 cm of soil fN = 1.32 - 0.04 C:N + 0.99 N, r2 = 0.73, P = 0.009). If confirmed, this relationship may prove useful to estimate the fertility modifier of radiation-use efficiency models (e.g., 3-PG) for Pinus radiata plantations in New Zealand. However, caution should be exercised for sites where mineral nutrients other than nitrogen limit productivity.

Palabras clave : Nutritional modifier; Pinus radiata; primary productivity; radiation-use efficiency; soil C/N; soil N.

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