Effects of fire severity in a north Patagonian subalpine forest

被引:56
作者
Kitzberger, T
Raffaele, E
Heinemann, K
Mazzarino, MJ
机构
[1] Univ Nacl Comahue, Lab Ecotono, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[2] Univ Nacl Comahue, Dept Quim, CRUB, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
关键词
canopy mortality; herbivory; Nothofagus; post-fire regeneration; seedling growth; seedling survival; soil property;
D O I
10.1111/j.1654-1103.2005.tb02333.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Question: What is the relative importance of fire-induced canopy mortality, soil burning and post-fire herbivory on tree seedling performance? Location: Subalpine Nothofagus pumilio forests at Challhuaco valley (41 degrees 13'S. 71 degrees 19'W), Nahuel Huapi National Park, Argentina. Methods: We fenced and transplanted soils of three burning severities alone a fire severity gradient produced by a fire in 1996. Over two growing seasons we monitored soil water, direct incoming solar radiation, seedling survival, final seedling total biomass and root/shoot ratio. Additionally, we assessed severity-related changes in soil properties. Results: Incoming radiation (an indicator of the amount of canopy cover left by the fire) was the primary factor influencing spring and summer top soil water availability, first and second-year seedling survival and seedling growth. While seedling survival and soil water content were negatively affected by increased radiation, seedling final biomass was highest in very open microsites. Burned soils showed lower water holding capacity and soil carbon; however these changes did not affect topsoil water, and, contrary to expectation, there was a slight tendency toward higher seedling survival on more heavily burned soils. Herbivory significantly reduced seedling survival, but only under high-radiation conditions. While the effect of radiation on final seedling biomass was not affected by herbivory, R/S ratios were significantly reduced by herbivory in high radiation microsites. Conclusions: Despite inducing faster aerial growth, increased radiation and herbivory in severely burned sites may effectively prevent post-fire regeneration in north Patagonian subalpine forest where seed sources are not limiting.
引用
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页码:5 / 12
页数:8
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