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post-fire recovery of puya raimondii, vegetation and birds in the p.na of Huascarán national park, perú

Journal of Mountain Science 2024年第1期21卷 20-32页

作者： Mery L.SUNI Giovana p.VADILLO César ARAna enoc.jara-p.na Letty SALInaS M.Estela pONCE paul M.RAMSAY plant physiology Laboratory Faculty of Biological SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru natural History Museum Universidad Nacional Mayor de San MarcosLima 15072Peru Applied phytology Laboratory Faculty of Biological SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru Department of Statistics Faculty of Mathematical SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru Department of Chemical and Biological Sciences Universidad de las Américas PueblaSan Andrés Cholula CP Cholula CP 72810Mexico

A large fire of 233 ha in Huascarán national park in peru provided an opportunity to compare plant and bird responses in burned and nearby unburned zones of the p.na. Heights and live diameters of flagship puya raimondii rosettes(assigned to four broad developmental phases), plant communities(66 species in 24 families and nine growth forms) and bird communities(77 species in six trophic guilds) were monitored after the fire. Although no mortality was observed, puya raimondii plants were affected by the fire, losing approximately 60% of their photosynthetic area across all developmental phases, but recovered quickly during the first two years after fire. The comparison of puya rosette recovery after fire was complicated by the changes in live rosette diameter for unburned plants, which showed plasticity of photosynthetic area linked to seasonal and annual fluctuations in precipitation in this relatively dry environment(decreased by 26% for mature adult plants over the study period). Fire caused an immediate change in the density, biomass and composition of vegetation. Although the species present remained similar, their abundances changed significantly immediately after the fire, with notable reductions in dominant tussock grasses. This provided opportunities for other plants, resulting in higher postfire diversity of plant species, genera, families and growth forms. In turn, the changes in vegetation after fire affected the composition of birds according to their trophic guild. Granivores largely disappeared,generalists were mostly unaffected, and other guilds showed a more complex response. As the vegetation recovered, most displaced birds returned within approximately one year.

关键词： Burning plant biomass Trophic guilds Andes Giant rosette plants

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nagata rings

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Frontiers of Mathematics in China 2015年第1期10卷 91-110页

作者： pascual jara Department of Algebra University of Granada 18071-Granada Spain

Let A be a commutative ring. For any set p of prime ideals of A, we define a new ring na（A, p）： the nagata ring. This new ring has the particularity that we may transform certain properties relative to p to properties on the whole ring na（A, p）; some of these properties are： ascending chain condition, Krull dimension, Cohen-Macaulay, Gorenstein. Our main aim is to show that most of the above properties relative to a set of prime ideals p（i.e., local properties） determine and are determined by the same properties on the nagata ring （i.e., global properties）. In order to look for new applications, we show that this construction is functorial, and exhibits a functorial embedding from the localized category （A, p）-Mod into the module category na（A,p）-Mod.

关键词： Cohen-Macaulay Gorenstein Krull nagata rings 13BA15 13B30 13F20 13F05 16S85

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