O limite de frio das árvores
Os limites da faixa de baixa temperatura das espécies de árvores resultam da interação da fenologia, tolerância ao congelamento na descarga e requisitos de comprimento da estação para maturação. Na linha das árvores de baixa temperatura, as árvores se tornam vítimas de sua altura.
É a aerodinâmica da árvore em forma de vida que impõe às árvores temperaturas do ar criticamente baixas e limitantes do crescimento, das quais as plantas de baixa estatura escapam.
Os humanos não podem mudar o limite de baixa temperatura das árvores (a linha das árvores), mas podem ter removido árvores da linha das árvores por corte ou queima. A linha das árvores rastreia os meios sazonais de baixa temperatura, o limite de alcance das espécies de árvores rastreia os extremos de baixa temperatura.
A linha das árvores é uma linha de referência bioclimática global mais importante contra a qual outras zonas bioclimáticas e os biomas associados podem ser definidos. Em altas altitudes ou latitudes, as árvores atingem os limites da faixa de baixa temperatura. Ao tentar uma explicação, os limites de alcance das espécies de árvores individuais (definidos pela tolerância ao congelamento) e o limite geral da árvore da forma de vida (definido pelas restrições de crescimento térmico) precisam ser distinguidos.
A borda fria geral do nicho fundamental das árvores é chamada de linha das árvores, por definição, a borda inferior do cinturão alpino, uma linha de referência bioclimática mais importante. As árvores podem estar ausentes da linha das árvores devido a distúrbios ou interações bióticas.
A borda local real da distribuição das árvores, o delineamento do nicho realizado, é impulsionada por efeitos estocásticos. Portanto, a teoria da linha das árvores e o teste de hipóteses estão inevitavelmente ligados ao conceito de nicho fundamental.
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