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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
25/08/1995 |
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Data da última atualização: |
06/04/2017 |
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Autoria: |
CHRISTENSEN, N. L.; MULLER, C. H. |
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Título: |
Effects of fire on factors controlling plant growth in Adenostoma chaparral. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
Ecological Monographs, v.45, n.1, p.29-55, 1975. |
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Idioma: |
Inglês |
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Conteúdo: |
In de 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 oxugen in unburned chaparral inhibits seed germination appearts 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 additions as ash-fall was also evaluated. Burning increased levels of most mineral elements significantly. Furthemorte a large reservoir of readily available organic nutrient was added in the ash. Causes of low nutrient levels in unburned chaparral were also investigated. Additions of nutrients to unburned levels in unburned chaparral were also investigated. Additions of nutrients to unburned chaparral soil in the greenhouse and field resulted in increased growth of species common in burned chaparral areas. Bioassay of aqueocus 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. Efforts to isolate and identify the toxins are described. Numbers of small herbovorous mammals were greatly reduced in recently burned chaparral. This factor is shown to have a 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. MenosIn de 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 oxugen in unburned chaparral inhibits seed germination appearts 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 additions as ash-fall was also evaluated. Burning increased levels of most mineral elements significantly. Furthemorte a large reservoir of readily available organic nutrient was added in the ash. Causes of low nutrient levels in unburned chaparral were also investigated. Additions of nutrients to unburned levels in unburned chaparral were also investigated. Additions of nutrients to unburned chaparral soil in the greenhouse and field resulted in increased growth of species common in burned chap... Mostrar Tudo |
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Palavras-Chave: |
Control; Controle; Efeito; Effect; Fabric. |
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Thesagro: |
Fábrica; Queimada. |
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Thesaurus Nal: |
Adenostoma fasciculatum; allelopathy; burning. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02928naa a2200253 a 4500
001 1785838
005 2017-04-06
008 1975 bl --- 0-- u #d
100 1 $aCHRISTENSEN, N. L.
245 $aEffects of fire on factors controlling plant growth in Adenostoma chaparral.
260 $c1975
520 $aIn de 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 oxugen in unburned chaparral inhibits seed germination appearts 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 additions as ash-fall was also evaluated. Burning increased levels of most mineral elements significantly. Furthemorte a large reservoir of readily available organic nutrient was added in the ash. Causes of low nutrient levels in unburned chaparral were also investigated. Additions of nutrients to unburned levels in unburned chaparral were also investigated. Additions of nutrients to unburned chaparral soil in the greenhouse and field resulted in increased growth of species common in burned chaparral areas. Bioassay of aqueocus 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. Efforts to isolate and identify the toxins are described. Numbers of small herbovorous mammals were greatly reduced in recently burned chaparral. This factor is shown to have a 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.
650 $aAdenostoma fasciculatum
650 $aallelopathy
650 $aburning
650 $aFábrica
650 $aQueimada
653 $aControl
653 $aControle
653 $aEfeito
653 $aEffect
653 $aFabric
700 1 $aMULLER, C. H.
773 $tEcological Monographs$gv.45, n.1, p.29-55, 1975.
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Embrapa Pantanal (CPAP) |
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