PCQM

AcronymDefinition
PCQMPerturbative Chiral Quark Model
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The second procedure used for PCQM was suggested by Eberhardt [50] and analyzed further by Hines and O'Hara Hines, [47]:
In a more detailed analysis, comparing each distance based estimator with the quadrat estimates, T-Square and PCQM were consistently more accurate than N-tree (Figures 4-6).
Regarding PCQM, for plots 1 and 4, z was above the critical value (1.96).
undulatum stands in Graciosa Island in a previous survey using PCQM [41].
In terms of accuracy of results, when compared with quadrat counts, the T-Square and PCQM estimators provided the best results.
Previous work [2, 3] concluded that PCQM was capable of yielding accurate results and was least susceptible to subjective bias than other methods [1].
It is recommended for aggregated spatial patterns (a limitation for the use of PCQM).
Caption: Figure 4: Comparison of distance methods and respective estimators (T-Square, [[lambda].sub.1]- [[lambda].sub.4]; PCQM, [[lambda].sub.5]- [[lambda].sub.7]; M-tree, [[lambda].sub.8]- [[lambda].sub.15] with quadrat counts, for tree density estimates in all six Pittosporum undulatum stands.
Al igual que en las variables de desarrollo, los ensambles C (PCQM) y D (con Casuarina) sobresalen por un incremento significativo en el aporte de MO, concomitante con la mayor cobertura y densidad de las copas, asi como con la mayor acumulacion de las bases intercambiables.
En el establecimiento rapido de la cobertura se recomiendan C (PCQM) o E (rico); si se requieren tallos altos para perchas o nodrizas, o aumentar el N del suelo, podria ser indicado el ensamble D (CasMU), el cual sin embargo, por contener una especie exotica, podria ejercer efectos indeseables en el largo plazo.
TABLA I ENSAMBLES CONSTRUIDOS CON ESPECIES ARBOREAS NATIVAS DEL BOSQUE NUBLADO EN MEXICO Y UNA EXOTICA T/I A (ECQU) B (LCPC) C (PCQM) I Erythrina americana Liquidambar macrophylla Platanus mexicana Miller (9) Oersted (9) Moric.