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| Bown,Horacio E; Mason,Euan G; Clinton,Peter W; Watt,Michael S. |
| Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clones, 68 plants) and eighteen (2 clones, 48 plants). Plant growth in stem diameter, height, leaf area, fascicle mass, length and diameter were found to significantly increase with N and, to a lesser extent, P additions; and these values were greatest when both N and P were combined. Plant growth and fascicle size also varied significantly across clones and were generally consistent with the genotypic growth responses that were observed in the field. Dark (Fv /... |
| Tipo: Journal article |
Palavras-chave: Chlorophyll fluorescence; Quantum efficiency of PSII; Electron transport; Genotype; Nutrient limitation. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012 |
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| Bown,Horacio E; Watt,Michael S; Clinton,Peter W; Mason,Euan G. |
| Patterns of carbon flux and partitioning were examined in highly stocked (40,000 stems ha-1) control and fertilized mini-plots of Pinus radiata D. Don at five sites, which covered a wide climatic and edaphic gradient on the South Island of New Zealand. The gross-primary productivity (GPP) and the partitioning of the GPP to the above- and below-ground productivity and respiration were determined using a carbon budget approach. All of the components of the GPP, the above-ground net primary productivity (ANPP [r² = 0.67, P ≤ 0.01]), above-ground plant respiration (APR [r² = 0.66, P ≤ 0.01]), and total below-ground carbon flux (TBCF [r² = 0.41, P ≤ 0.01]) significantly increased with the GPP, but the ANPP:GPP, APR:GPP and TBCF:GPP... |
| Tipo: Journal article |
Palavras-chave: Gross- primary productivity; Net-primary productivity; Nitrogen; Pinus radiata D. Don; Phosphorus; Total below-ground carbon flux; Whole carbon budget. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200013 |
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| Bown,Horacio E; Watt,Michael S. |
| Stem CO2 efflux is a highly variable component of the carbon budget of forest ecosystems. It reflects the balance between the CO2 respired by the living stem tissues, less the CO2 dissolved in the xylem sap moving upward in the transpiration stream, plus the CO2 transported from the roots and released at the stem. Although knowledge about such fluxes at different spatial and temporal scales has markedly increased, knowledge of the effects of silviculture treatments, such as fertilization, on stem CO2 effluxes are still limited, particularly when connecting above- and belowground processes. Using measurements obtained from twin plots (one control, one fertilized) installed in five-, 12- and 23-year-old stands of Pinus radiata, the objective of this study... |
| Tipo: Journal article |
Palavras-chave: Aboveground; Age; Belowground; CO2 efflux; Fertilization; Forest plantation. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100009 |
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