A model of woody-herbaceous biomass relationships in eucalypt and mesquite communities
Author
Scanlan, J. C.Issue Date
1992-01-01Keywords
Eucalyptuseucalyptus crebra
Australia
simulation models
Prosopis glandulosa
competitive ability
understory
mathematical models
biomass production
plant communities
Metadata
Show full item recordCitation
Scanlan, J. C. (1992). A model of woody-herbaceous biomass relationships in eucalypt and mesquite communities. Journal of Range Management, 45(1), 75-80.Publisher
Society for Range ManagementJournal
Journal of Range ManagementDOI
10.2307/4002530Additional Links
https://rangelands.org/Abstract
A spatial simulation model was developed to examine the community-level relationships between woody overstory and herbaceous understory. The influences of individual trees on herbaceous understory were aggregated into stimulatory and competitive effects which were represented as indices. The net index at a particular point on the landscape was calculated by multiplying the indices of all trees having an effect at that point. Simulated sampling of computer-generated communities (calculating the net index at a number of randomly selected points) enabled the herbaceous production to be estimated for communities of defined tree density and size. The model was parameterized for eucalypt (Eucalyptus crebra F. Muell.) communities in northeastern Australia and for honey mesquite (Prosopis glandulosa var glandulosa Torr.)-mixed brush areas in southwestern U.S.A. When a net competitive effect exists around individual trees, a negative curvilinear relationship between herbaceous yield and tree density was observed in the simulations. If stimulatory effects dominate at the individual tree level, herbaceous yield at the community level was highest at intermediate tree densities. Thus the extremes of relationships seen in the literature can be reproduced simply by altering the relative strength of stimulation and competition in this model. The model can be used to examine the change in herbaceous yield at the community level following manipulation of woody cover.Type
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/4002530