Palabras clave
biomass
allometric formula
Amazon
climate change mitigation
Biodiversidad
biomasa
fórmula alométrica
Amazonía
mitigación del cambio climático
Cómo citar
Resumen
Los sistemas agroforestales diversos concilian la producción de alimentos, la conservación de la biodiversidad y la provisión de servicios ecosistémicos como el secuestro de carbono atmosférico. Sin embargo, el papel de la riqueza florística sobre la producción de carbono en la biomasa de estos sistemas no está claro. Este estudio evaluó el efecto de la riqueza de especies y la estructura de la vegetación sobre el carbono en la biomasa de diferentes sistemas agroforestales, en la Amazonía Sur de Bolivia. Para eso, fueron estudiados 25 sistemas agroforestales y 4 bosques secundarios, en los departamentos de Santa Cruz y Beni. En cada sistema se instalaron parcelas circulares de 1 963 m2, donde la vegetación (árboles, arbustos y herbáceas) y necromasa (hojarasca, ramas y árboles muertos) fueron muestreados. Se utilizó funciones lineales y logarítmicas para evaluar el efecto de la riqueza y estructura de la vegetación sobre el carbono; y la partición de la varianza para examinar el efecto puro y compartido de las variables riqueza y estructura. Las regresiones mostraron una relación positiva fuerte de la riqueza de especies sobre el carbono de la biomasa (r2 = 0.74; P < 0.001). En la partición de la variancia, el 85.7 % de la variabilidad del carbono fue explicada por la riqueza, estructura y variación de la estructura. De forma aislada, la riqueza explicó el 12.7 %, la estructura el 8.8 % y la variación de la estructura el 4.8 %. Estos resultados confirman que el carbono en la biomasa sobre el suelo aumenta con la riqueza de especies y la variación estructural de la vegetación. Por lo tanto, sistemas agroforestales más biodiversos y estratificados son más eficientes en el uso de los recursos y pueden contribuir con la mitigación del cambio climático.
Citas
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