Resource allocation of chilean herbs in response to climatic and microclimatic factors
- 31 December 1978
- journal article
- research article
- Published by Springer Nature in Oecologia
- Vol. 40 (1), 81-89
- https://doi.org/10.1007/bf00388812
Abstract
Resource allocation to aerial vegetative, underground vegetative, and reproductive biomass is studied in four Chilean herbs: the annuals Chaetanthera ciliata, Erodium cicutarium, Trisetobromus hirtus, and the perennial Solenomelus peduncularis. Absolute (weight), and relative (% vegetative/total, % root/shoot) changes in biomass were determined in relation to concomitant changes in a climatic (rain regime in two subsequent years) and a microclimatic factor (spatial distribution of herbs, whether underor between-shrubs). In regard to the climatic factor, taking as basis the normal rainfall year, our results can be summarized as: 1) All herbs studied exhibit greater production in the rainy year. This is accounted for by increases in the biomass of all herbs' fractions, i.e. in aerial vegetative, underground vegetative and reproductive. 2) All annuals exhibit greater vegetative fractions (i.e. smaller reproductive fractions) in the rainy year. The perennial does not change its vegetative: reproductive balance. 3) Herbs studied exhibit contrasting responses to rainy year concerning root/shoot ratio: C. ciliata increasing it, E. cicutarium decreasing it, T. hirtus and S. peduncularis not changing it. In regard to the microclimatic factor, taking as basis the patterns exhibited by T. hirtus and S. peduncularis under-shrubs, our results can be summarized as: 1) Both species exhibit smaller production in exposed areas between-shrubs, whether in the rainy or normal year. 2) T. hirtus does not change its vegetative fraction between-shrubs neither in the rainy nor in the normal year. S. peduncularis exhibits a smaller vegetative fraction (i. e. greater reproductive fraction) between-shrubs only in the normal year. 3) Neither species change its root/shoot ratio between-shrubs, neither in the rainy nor in the normal year. Results obtained are interpreted on basis of the theory of life-history strategies.Keywords
This publication has 11 references indexed in Scilit:
- Reproductive Strategies in Herbaceous Plant Communities During SuccessionEcology, 1978
- Herbaceous vegetation in the Chilean matorralOecologia, 1977
- A Comparative Study of the Grassland of California and ChileFlora, 1977
- A Comparison of the Pattern of Herb and Shrub Growth in Comparable Sites in Chile and CaliforniaThe American Midland Naturalist, 1977
- Convergence in Vegetation Structure along Analogous Climatic Gradients in California and ChileEcology, 1975
- THE SEASONAL CAMBIUM ACTIVITY OF CHILEAN AND CALIFORNIAN SHRUBSAmerican Journal of Botany, 1975
- Dry weight indicates energy allocation in ecological strategy analysis of plantsOecologia, 1975
- The Concept of r- and K-Selection: Evidence from Wild Flowers and Some Theoretical ConsiderationsThe American Naturalist, 1972
- Vegetation Comparisons between the Mediterranean Climatic Areas of California and ChileFlora, 1970
- Life Historical Consequences of Natural SelectionThe American Naturalist, 1970