Abstract
Abstract: Questions: How does tree growth in a tropical woodland savanna vary as a function of size, and how is it affected by competition from neighbours, site attributes, and damage caused by disturbance? Location: western Zimbabwe. Methods: Trees of common species were tagged, mapped, and measured annually between 2001 and 2003 in a Kalahari sand woodland savanna. Diameter increments were analysed with mixed model regressions for the largest ramet in each genet. Stem diameter and damage, soil texture, and indices of competition at multiple spatial scales were used as covariates. Results: Stem diameter increased initially and then declined as a function of size in undamaged trees, which grew faster than damaged trees. Growth in damaged trees declined with size. No site differences were detected, and there was evidence for between‐tree competition on growth only in the fastest‐growing species, Brachystegia spiciformis. In several species the growth rate of the largest ramet increased as a function of the basal area of secondary ramets, contrary to expectations. For many species, the growth models showed poor explanatory power. Conclusions: Growth in Kalahari sand savanna trees varies as a function of size and changes in tree architecture caused by disturbance agents such as fire, frost, and elephant browsing. Disturbance may thus play an important role on vegetation dynamics through its effects on growth in the post‐disturbance phase. Growth is highly stochastic for some species in this system, and more deterministic in others. It is hypothesized that this dichotomy may be driven by differences in rooting depth among species.
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Claims 9
Claim · model-written summary
Stem diameter increased initially and then declined as a function of size in undamaged trees
Verbatim
e0“Stem diameter increased initially and then declined as a function of size in undamaged trees”
Claim · model-written summary
undamaged trees, which grew faster than damaged trees
Verbatim
e0“undamaged trees, which grew faster than damaged trees”
Claim · model-written summary
Growth in damaged trees declined with size
Verbatim
e0“Growth in damaged trees declined with size”
Claim · model-written summary
No site differences were detected
Verbatim
e0“No site differences were detected”
t0“Tree growth”
Claim · model-written summary
there was evidence for between‐tree competition on growth only in the fastest‐growing species, Brachystegia spiciformis
- Taxon
- Brachystegia spiciformis
Brachystegia spiciformise0 - Interactor
- treee0other
- Outcome
- growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was evidence for between‐tree competition on growth only in the fastest‐growing species, Brachystegia spiciformis”
Claim · model-written summary
In several species the growth rate of the largest ramet increased as a function of the basal area of secondary ramets
Verbatim
e0“In several species the growth rate of the largest ramet increased as a function of the basal area of secondary ramets”
Claim · model-written summary
For many species, the growth models showed poor explanatory power
Not reportedValue
Verbatim
e0“For many species, the growth models showed poor explanatory power”
Claim · model-written summary
Growth is highly stochastic for some species in this system, and more deterministic in others
Verbatim
e0“Growth is highly stochastic for some species in this system, and more deterministic in others”
Claim · model-written summary
It is hypothesized that this dichotomy may be driven by differences in rooting depth among species
Verbatim
e0“It is hypothesized that this dichotomy may be driven by differences in rooting depth among species”