Claim · model-written summary
Pasture production was lower with higher tree basal area.
- Taxon
- Acacia harpophylla
Acacia harpophyllat0 - Outcome
- Pasture productione0
- Direction
- lowere0
- Setting
- tree basal area of A. harpophyllae0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Acacia harpophylla”
e0“Pasture production, pasture basal area and the proportion of sown pasture species were lower at higher tree basal area of A. harpophylla .”
Title
Woody overstorey and herbaceous understorey biomass in Acacia harpophylla (brigalow) woodlands
J. C. SCANLAN Australian Journal of Ecology 1991. doi:10.1111/j.1442-9993.1991.tb01081.x
Other claims from this paper (12)
- Observation Leaf biomass reached 12 t ha ‐1 at maximum.
- Observation Leaf area index reached 2.5.
- Association pasture basal area was lower with higher tree basal area.
- Association the proportion of sown pasture species was lower with higher tree basal area.
- Observation The greatest decrease occurred between 0 and 2 m 2 ha ‐2 tree basal area.
- Observation Annual grasses and broadleaf species represented a greater biomass proportion at high tree basal area.
- Observation The poor control achieved by herbicide sprays on A. harpophylla plants that are 2–2.5 m tall would be partly due to poor coverage of the herbicide spray, as leaf area index is at a maximum at this stage.
- Recommendation A density of 1000 plants ha ‐1 is a threshold value above which regrowth control would be necessary at some stage to maintain acceptable pasture production and composition .
- Observation The non‐linear regression relationship between pasture production and tree basal area was similar to that observed in Eucalyptus spp.
- Observation the value of k for A. harpophylla communities was generally higher than observed in Eucalyptus spp. communities with the same potential pasture production in the absence of trees.
- Observation Within even‐aged stands, the use of tree leaf biomass to predict pasture production showed no advantage over the use of tree basal area as the predictor.
- Observation there are advantages in using tree leaf biomass as a predictor when comparing communities with different size‐ or age‐class structures.