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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
07/06/2000 |
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Data da última atualização: |
07/06/2000 |
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Autoria: |
BARDGETT, R. D.; CHAN, K. F. |
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Título: |
Experimental evidence that soil fauna enhance nutrient mineralization and plant nutrient uptake in montane grassland ecosystems. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 31, p. 1007-1014, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
This microcosm study is concerned with understanding those factors which regulate ecosystem processes of nutrient cycling and plant productivity in a montage grassland ecosystem. We examined the effects of different groups of soil fauna, namely bacterial-feeding nematodes and Collembola; on nutrient mineralization (N and P) in an acid, organic soil taken from a montane grassland in the Peak District National Park, United Kingdom. We also examined whether faunal influences on nutrient release, a measure of nutrient mineralization, resulted in changes in nutrient uptake and biomass production of an indigenous montane grass species (Nardus stricta (L.)). We found that in the presence of Collembola, and when nematodes and Collembola were combined, N mineralization, nutrient leaching and shoot N contents of N. stricta was significantly increased relative to a defaunated control. We aLso found that net P mineralization and leaching increased (although not significantly) in the presence of both nematodes abd Collembola, resulting in a significant increase in shoot P content of N. stricta. The presence of nematodes alone, which were largely bacterial-feeders, had no effect on the mineralization of N or P, or shoot nutrient content. We suggest that differences in the effect of faunal treatments on nutrient mineralization are related to the feeding strategies of the added fauna, and to their consequent effect on the size of the soil microbial biomass. The treatments that increased N mineralization and plant nutrient content (N and P) also significantly reduced plant growth (shoot and root). We suggest that high NH4+ -N concentrations in the soil solution of Collembola treatments inhibited the growth of N. stricta and that the growth of other grassland species may benefit from this improvement in nutrient availability. MenosThis microcosm study is concerned with understanding those factors which regulate ecosystem processes of nutrient cycling and plant productivity in a montage grassland ecosystem. We examined the effects of different groups of soil fauna, namely bacterial-feeding nematodes and Collembola; on nutrient mineralization (N and P) in an acid, organic soil taken from a montane grassland in the Peak District National Park, United Kingdom. We also examined whether faunal influences on nutrient release, a measure of nutrient mineralization, resulted in changes in nutrient uptake and biomass production of an indigenous montane grass species (Nardus stricta (L.)). We found that in the presence of Collembola, and when nematodes and Collembola were combined, N mineralization, nutrient leaching and shoot N contents of N. stricta was significantly increased relative to a defaunated control. We aLso found that net P mineralization and leaching increased (although not significantly) in the presence of both nematodes abd Collembola, resulting in a significant increase in shoot P content of N. stricta. The presence of nematodes alone, which were largely bacterial-feeders, had no effect on the mineralization of N or P, or shoot nutrient content. We suggest that differences in the effect of faunal treatments on nutrient mineralization are related to the feeding strategies of the added fauna, and to their consequent effect on the size of the soil microbial biomass. The treatments that increased N m... Mostrar Tudo |
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Palavras-Chave: |
Biomassa microbiana; C; Fauna do solo; Growth; Microcosmo; Microcosms; P; Plant. |
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Thesagro: |
Análise Estatística; Carbono; Crescimento; Ecossistema; Fósforo; Nutriente; Pastagem; Planta. |
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Thesaurus Nal: |
carbon; ecosystems; grasslands; microbial biomass; nutrients; phosphorus; soil fauna; statistical analysis. |
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Categoria do assunto: |
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Marc: |
LEADER 02932naa a2200421 a 4500
001 1621171
005 2000-06-07
008 1999 bl --- 0-- u #d
100 1 $aBARDGETT, R. D.
245 $aExperimental evidence that soil fauna enhance nutrient mineralization and plant nutrient uptake in montane grassland ecosystems.
260 $c1999
520 $aThis microcosm study is concerned with understanding those factors which regulate ecosystem processes of nutrient cycling and plant productivity in a montage grassland ecosystem. We examined the effects of different groups of soil fauna, namely bacterial-feeding nematodes and Collembola; on nutrient mineralization (N and P) in an acid, organic soil taken from a montane grassland in the Peak District National Park, United Kingdom. We also examined whether faunal influences on nutrient release, a measure of nutrient mineralization, resulted in changes in nutrient uptake and biomass production of an indigenous montane grass species (Nardus stricta (L.)). We found that in the presence of Collembola, and when nematodes and Collembola were combined, N mineralization, nutrient leaching and shoot N contents of N. stricta was significantly increased relative to a defaunated control. We aLso found that net P mineralization and leaching increased (although not significantly) in the presence of both nematodes abd Collembola, resulting in a significant increase in shoot P content of N. stricta. The presence of nematodes alone, which were largely bacterial-feeders, had no effect on the mineralization of N or P, or shoot nutrient content. We suggest that differences in the effect of faunal treatments on nutrient mineralization are related to the feeding strategies of the added fauna, and to their consequent effect on the size of the soil microbial biomass. The treatments that increased N mineralization and plant nutrient content (N and P) also significantly reduced plant growth (shoot and root). We suggest that high NH4+ -N concentrations in the soil solution of Collembola treatments inhibited the growth of N. stricta and that the growth of other grassland species may benefit from this improvement in nutrient availability.
650 $acarbon
650 $aecosystems
650 $agrasslands
650 $amicrobial biomass
650 $anutrients
650 $aphosphorus
650 $asoil fauna
650 $astatistical analysis
650 $aAnálise Estatística
650 $aCarbono
650 $aCrescimento
650 $aEcossistema
650 $aFósforo
650 $aNutriente
650 $aPastagem
650 $aPlanta
653 $aBiomassa microbiana
653 $aC
653 $aFauna do solo
653 $aGrowth
653 $aMicrocosmo
653 $aMicrocosms
653 $aP
653 $aPlant
700 1 $aCHAN, K. F.
773 $tSoil Biology and Biochemistry, Oxford$gv. 31, p. 1007-1014, 1999.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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