Document


Title

Effects of fire on factors controlling plant growth in Adenostoma chaparral
Document Type: Journal Article
Author(s): N. L. Christensen ; C. H. Muller
Publication Year: 1975

Cataloging Information

Keyword(s):
  • Adenostoma
  • Adenostoma fasciculatum
  • allelopathy
  • Allophyllum glutinosum
  • annual plants
  • ash
  • bacteria
  • Bromus rigidus
  • calcium
  • Centaurea melitensis
  • chaparral
  • chemistry
  • Convolvulus cyclostegius
  • Cryptantha intermedia
  • cutting
  • Erigeron divergens
  • Eucrypta chrysanthemifolia
  • fungi
  • germination
  • grazing
  • heat
  • heat effects
  • herbaceous vegetation
  • herbivory
  • K - potassium
  • Lactuca serriola
  • leaves
  • light
  • Lotus scoparius
  • magnesium
  • mammals
  • minerals
  • moisture
  • mountains
  • nitrogen
  • nutrient cycling
  • nutrients
  • openings
  • organic matter
  • oxygen
  • perennial plants
  • pH
  • Phacelia grandiflora
  • phosphorus
  • plant growth
  • post fire recovery
  • precipitation
  • range management
  • regeneration
  • S - sulfur
  • seasonal activities
  • seed dormancy
  • seed germination
  • seedlings
  • seeds
  • shrubs
  • site treatments
  • small mammals
  • soil moisture
  • soil nutrients
  • soil organic matter
  • succession
  • weeds
Region(s):
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 33165
Tall Timbers Record Number: 7302
TTRS Location Status: In-file
TTRS Call Number: Journals-E
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

In the first few years following fire, burned chaparral areas are typified by a flush of seed germination and seedling growth not seen in unburned chaparral. The effects of fire on factors of potential importance to this plant response were examined in recently burned and long unburned chaparral, dominated by Adenostoma fasciculatum, in the Santa Ynez Mountains near Santa Barbara, California. Measurement of soil moisture, soil texture, and light indicated that changes in these factors following fire had little direct effect on postfire germination and growth. Bacteria and fungi were more abundant in burned than in unburned chaparral soil. Thus, the hypothesis that microbial depletion of soil oxygen in unburned chaparral inhibits seed germination appears untenable. Changes in organic matter content, pH, nitrogen, phosphorus, sulfur, potassium, calcium, and magnesium were examined in the upper soil layers of both burned and unburned chaparral during the first 18 mo following fire. Mineral addition as ash-fall was also evaluated. Burning increased levels of most mineral elements significantly. Furthermore, a large reservoir of readily available organic nutrients was added in the ash. Causes of low nutrient levels in unburned chaparral were also investigated. Additions of nutreints to unburned chaparral soil in the greenhouse and field resulted in increased growth of species common in burned chaparral areas. Bioassays of aqueous A. Fasciculatum leaf washings were performed against 10 plant species common in burned chaparral areas. Significant depression of germination and growth was observed. Rain throughfall collected under the shrubs was also inhibitory. Effects to isolate and identify the toxins are described. Numbers of small herbivorous mammals were greatly reduced in recently burned chaparral. This factor is shown to have marked effect on seedling survival. Applications of various heat treatments to unburned chaparral soil and to fresh seeds of species common to burned chaparral indicated that the seed of several species are released from dormancy by heat. Insolational heating of soil in cleared, but unburned, chaparral is sufficient to stimulate germination.© by the Ecological Society of America. Abstract reproduced by permission.

Online Link(s):
Citation:
Christensen, N. L., and C. H. Muller. 1975. Effects of fire on factors controlling plant growth in Adenostoma chaparral. Ecological Monographs, v. 45, no. 1, p. 29-55.