Herbage production-forest overstory relationships in two Arizona ponderosa pine forests

Abstract

Utilizing source data for annual herbage production which had been obtained through repeated measurements, though not necessarily taken in each year, in 2 Arizona ponderosa pine (Pinus ponderosa) forests from 1959 to 1980, 18 herbage production-forest overstory regression equations were developed and statistically analyzed. In addition to logarithmic and exponential transformations, a hyperbolic transformation met the specific acceptance criteria. Soils were stratified for some herbage components to improve sampling efficiencies. The regression equations presented are considered more useful for long-term planning purposes than for predicting the level of herbage production in a particular year.