Interações entre índice de área foliar, densidade do dossel e precipitação efetiva de uma floresta de Polylepis reticulata localizada em um ecossistema de páramo
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Publicado:
2021-08-27
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Polylepis reticulata, índice de área foliar, densidade do dossel, precipitação efetiva
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Resumo
A medição da cobertura vegetal é fundamental para saber qual a porcentagem da precipitação é interceptada sobre a mesma. As técnicas mais utilizadas para medir a cobertura in situ são o índice de área foliar (IAF) e a densidade do dossel (DD). No entanto, nenhuma atenção tem sido dada às diferenças registradas no uso das duas técnicas ou como essas variáveis ??influenciam o balanço hidrológico, particularmente a precipitação efetiva (EP). Por esse motivo, o objetivo do estudo é avaliar a relação entre as medições da cobertura vegetal feitas pelos métodos IAF e DD e identificar como elas se relacionam com a PE, importante para aplicações hidrológicas.
O estudo foi realizado em uma floresta de Polylepis reticulata de 15.633 m2, localizada no Observatório Ecohidrológico Zhurucay, sul do Equador, na faixa altitudinal de 3765 a 3809 m. a.s.l. O IAF foi medido com o equipamento CI-110 Plant Canopy Imager e o DD com densiômetro esférico, cobrindo uma ampla gama de valores de cobertura de dossel. Para medir o PE, o local do estudo foi equipado com 9 pluviômetros. Os resultados indicam que o IAF e o DD são em média 2,43 m2 m-2 e 88%, respectivamente, cuja relação acaba sendo significativa (R2 = 0,913; p <0,05). O PE médio anual é de 773,2 mm, que tende a diminuir com o aumento do IAF e DD; embora sua relação não seja estatisticamente significativa (valores de p> 0,05). Este estudo mostra a importância da caracterização da cobertura vegetal para o entendimento da interação com o PE.
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Gerrits, A., L. Pfister y H. Savenije (2010). «Spatial and temporal variability of canopy and forest floor interception in a beech forest». En: Hydrological Processes 24.21, 3011-3025. Online: https://bit.ly/2RYbo4g
Gerrits, M. (2010). «The role of interception in the hydrological cycle». Doctoral thesis. Delft, Net herlands: Technische Universiteit Delft. Online: https://bit.ly/3omnEr7
Gomez, D. y col. (2008). «Rainfall and cloud-water interception in tropical montane forests in the eastern Andes of Central Peru». En: Forest Ecology and Management 255.3-4, 1315-1325. Online: https://bit.ly/3tWXhJx
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Hoch, G. y C. Körner (2005). «Growth, demography and carbon relations of Polylepis trees at the world’s highest treeline». En: Functional Ecology 19.6, 941-951. Online: https://bit.ly/3fjdzHD
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