- Published on
Botanical Terms -absolute pollen frequency (APF)
The expression of *pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are known, per unit time. This method provides more precise information in some situations than the conventional expression as *relative pollen frequencies (RPFs). When comparing sites that differ in one or more high-pollen producers, APFs are especially helpful. For instance, an RPF method's copious pollen may indicate a decline in herbaceous species when trees first arrive in the area pollen rain, but an APF method's analysis will reveal consistent values for herb species.
The expression of *pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are known, per unit time. This method provides more precise information in some situations than the conventional expression as *relative pollen frequencies (RPFs). When comparing sites that differ in one or more high-pollen producers, APFs are especially helpful. For instance, an RPF method's copious pollen may indicate a decline in herbaceous species when trees first arrive in the area pollen rain, but an APF method's analysis will reveal consistent values for herb species.
0 Comments