TAILIEUCHUNG - Báo cáo lâm nghiệp: "Response to natural and simulated browsing of two Mediterranean oaks with contrasting leaf habit after a wildfire"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Response to natural and simulated browsing of two Mediterranean oaks with contrasting leaf habit after a wildfire" | Ann. For. Sci. 63 2006 441-447 INRA EDP Sciences 2006 DOI forest 2006024 441 Original article Response to natural and simulated browsing of two Mediterranean oaks with contrasting leaf habit after a wildfire Josep Maria Espelta Abdessamad Habrouk Javier Retana Centre de Recerca Ecològica i Aplicacions Forestals CREAF i Unitat d Ecologia Universitat Autònoma de Barcelona 08193 Bellaterra Barcelona Spain Received 31 May 2005 accepted 14 December 2005 Abstract - In this study we explore the response to browsing of two co-occurring Mediterranean oaks the evergreen Quercus ilex and the deciduous Quercus cerrioides resprouting in areas affected by large wildfires in central Catalonia NE Spain . We tested three hypotheses i differences in the preference of browsers will cause a higher impact of browsing on the deciduous oak ii the deciduous oak will show a lower response to browsing than the evergreen one and iii the response to browsing of Q. ilex and Q. cerrioides will differ depending on the season of the year when browsing occurs. To test the first hypothesis we undertook the monitoring of the degree of browsing on resprouting evergreen and deciduous oaks after fire while the second and third hypothesis were tested by mean of an experiment with different intensities of simulated browsing in different seasons of the year. The results indicate that Q. cerrioides individuals were more heavily browsed than Q. ilex ones. Moreover browsing matched the two species in most of the size variables considered cancelling the advantage in height and crown projection of the deciduous oak at the beginning of the resprouting process. In the experiment of simulated browsing Q. ilex and Q. cerrioides showed a similar response to the different intensities of simulated browsing applied but differences between species occurred depending on the season of the year when browsing occurred Q. ilex showed a higher growth rate of crown projection than Q. cerrioides when it was browsed in

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