Predicting Biomass of Five Shrub Species in Northeastern California

Abstract

Volume, crown dinmeter, and number of twiga were alI highly correlated with biomass of individual shrub of bitterbrusb (Pw-SlJo tridentufu (Pursh)DC), greenleaf manxanita (Arctostaphylos pat& Greene), big sagebrush (Artewhia tri&ntata NW.), snowbrush (Ceanothus v&tinus Doug. ex. Hook), end gray rabbitbrush (Chrysothawuws nauseosus (Pall.)Britton). These variables were used to develop equations to predict above-ground dry weigh% R, values varied from 0.76 to 0.98. Oven-dry weights were 39 to 71% of live weight in the field. methods on understory vegetation on Blacks Mountain Experimental Forest in northeastern California. Relationships between wet and dry weights were also calculated Study Site The Blacks Mountain Experimental Forest is located on the Lassen National Forest, Lassen County, California. Approximately half of the forest lies in a gently rolling basin; the rest extends up moderate slopes to the north and east. Elevations vary

Forage biomass of 22 shrub species from Monfragüe Natural Park (SW Spain) assessed by log–log regression models

“…Our observations in the field indicate that the biggest male deer can stand up straight on their back legs and feed on shrubs 2?5 m high. Equation (2), used to estimate volume (see Material and methods), is the mathematical expression of an elliptical cylinder and can be found in many studies ( Vora, 1988). Obviously, this is not the exact statistical representation of the plant but other studies carried out with more complex forms (inverted cone, two adjacent cones, elliptical cone, etc.)…”

Biomass equations for four shrub species in subtropical China

“…For establishing regressions of shrub biomass, D, D 2 H, CA, and H are typically used as independent variables (Murray and Jacobson 1982;Vora 1988;Paton et al 2002;Návar et al 2004). In some cases, D is the best predictor (Clough and Scott 1989;Haase and Haase 1995;Paton et al 1998Paton et al , 2002.…”

“…Total harvesting is generally impractical or inappropriate in shrub studies, so allometric methods have been developed for estimation of total biomass from nondestructive surrogate measurements such as shrub height and diameter at breast/basal level (Smith and Brand 1983;Vora 1988;Buech and Rugg 1989;Tietema 1993). Equations used to estimate plant organ biomass and total biomass are required for better understanding of the carrying capacity of plant communities for several purposes, for example grazing, timber, fuel wood, other non-timber forest products, and the environmental services provided by sequestering CO 2 .…”

Physico-chemical properties of soil under the canopies of Faidherbia albida (Delile) A. Chev and Acacia tortilis (Forssk.) Hayen in park land agroforestry system in Central Rift Valley, Ethiopia

“…Average diameter of eight F. albida and A.tortilis was 43.31 and 47.71 cm, respectively. The two longest canopy radii perpendicular to each other and parallel to the ground were measured and used to calculate canopy area, using Equation 1 (Vora, 1988). Relatively homogenous site conditions in terms of slope, aspect and topography and growth and vigor of the trees were also considered in the selection of the trees of each species.…”