Silvicultural manipulation and site effect on above and belowground biomass equations for young Pinus radiata

There is little understanding of how silvicultural treatments, during the early stages of tree development, affect allometric relationships. We developed and compared stem, branch,foliage, coarse and fine root biomass, and leaf area estimation equations, for four-year-old genetically improved radiata pine trees grown on three contrasting soil-site conditions. Ateach site, selected trees were destructively sampled from a control (shovel planted, no weed control, fertilized with 2 g of boron), a shovel plantedþweed control (2 first years)þcomplete fertilization (nitrogenþphosphorusþboron 2 first yearsþpotassium2nd year), and a soil tillage (subsoil at 60 cm)þweed control (first 2 years)þcompletefertilization treatment. Tissues were separated into foliage, branch, stem, fine and coarse roots (>2 mm). Regression equations for each tree biomass tissue versus leaf area were fit for each site and compared among treatments and sites with the same genetic material.Our results indicated that individual tree biomasses for young plantations are affected by silvicultural treatment and site growing conditions. Higher variability in estimates was found for foliage and branches due to the ephemeral nature of these components. Stem Biomass equations vary less, but differences in biomass equations were found among sites and treatments. Coarse root biomass estimates were variable but less than expected,considering the gradient among sites. Similar to stem biomass, a simple positive general linear relationship between root collar diameter, or diameter at breast height with coarse root biomass was developed across sites and treatments.

Bibliographic Details

Main Authors:	113798 Rubilar, Rafael A. Universidad de Concepción, Concepción, Chile, 41530 Allen, H. Lee (autor/a) North Carolina State University Forest Nutrition Cooperative, Raleigh, USA, 42186 Alvarez, Jose S. (autor/a) North Carolina State University Forest Nutrition Cooperative, Raleigh, USA, 41035 Albaugh, Timothy J. (autor/a) North Carolina State University Forest Nutrition Cooperative, Raleigh, USA, 68677 Fox, Thomas R. (autor/a) Virginia Polytechnic Institute and State University, Blacksburg, USA, 121472 Stape, Jose L (autor/a) North Carolina State University Forest Nutrition Cooperative, Raleigh, USA
Format:	Texto biblioteca
Language:	spa
Published:	Elsevier 2010
Subjects:	PINUS RADIATA, SILVICULTURA, BIOMASA, ALOMETRIA, ARBOLES, MEDICION, MODELOS DE REGRESION, ECUACIONES ALOMETRICAS,
Online Access:	https://www.sciencedirect.com/science/article/abs/pii/S0961953410002394?via%3Dihub
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