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Jimenez E.,Research Center e Informacion Ambiental Lourizan | Vega J.A.,Research Center e Informacion Ambiental Lourizan | Perez-Gorostiaga P.,Research Center e Informacion Ambiental Lourizan | Fonturbel T.,Research Center e Informacion Ambiental Lourizan | Fernandez C.,Research Center e Informacion Ambiental Lourizan
European Journal of Forest Research | Year: 2010

Sap flow density and meteorological variables were monitored in a very dense Acacia melanoxylon stand (about 9,000 trees/ha) in north-western Iberian Peninsula during the growing season of 2006 (from 8 June to 24 August). Evidences of an increment of stomatal control on transpiration were observed during the study period, probably as a consequence of higher evaporative demand of the atmosphere. However, high sap flow density values observed for the whole study period (from 1.14 to 52.73 dm3 dm-2 day-1) were similar than those found for other fast-growing species. Mean transpiration for the whole study period was 2.21 mm day-1, with a maximum value of 3.17 mm day-1 and a minimum of 1.23 mm day-1. Mean sap flow density values were correlated with crown length and crown ratio, relationships being fairly weak with other dendrometric parameters such as tree diameter or height. Mean transpiration values were correlated with main dendrometric parameters (diameter at breast height, total height, crown length, sapwood area and leaf biomass). It was found that the degree of competition per tree could be used as a good index for sap flow density. Taking into account the high tree density of the stand and the sap flow density values, water consumptions of A. melanoxylon can be very high, playing a relevant role in the hydrological balances of the watersheds where it grows. © Springer-Verlag 2008. Source

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