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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
01/10/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
HOOK, P. B.; BURKE, I. C.; LAUENROTH, W. K. |
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Título: |
Heterogeneity of soil and plant N and C associated with individual plants and openings in North American shortgrass steppe. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Plant and Soil, v.138, p.247-256, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
Small-scale spatial heterogeneity of soil organic matter (SOM) associated with patterns of plant cover can strongly influence population and ecosystem dynamics in dry regions but is not well characterized for semiarid grasslands. We evaluated differences in plant and soil N and C between soil from under individual grass plants and from small openings in shortgrass steppe. In samples from 0 to 5 cm depth, root biomass, root N, total and mineralizable soil N, total and respirable organic C, C: N ratio, fraction of organic C respired, and ratio of respiration to N mineralization were significantly greather for soil under plants than soil from openings. These differences, which were consistent for two sites with constrating soil testures, indicate strong differentiation of surface soil at the scale of individual plants, with relative enrichment of soil under plants in total and active SOM. Between-microsite differences were substantial relative to previously reported differences associated with landscape postiion and grazing intensity in shortgrass steppe. We conclude that microscale heterogeneity in shortgrass steppe deserves attention in invetigation of controls on ecosystem and poapulation processes and when sampling to estimate properties at plot or site scales. |
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Palavras-Chave: |
Grassland; Nitrogen mineralization; Plant; Respiration. |
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Thesagro: |
Matéria Orgânica; Mineralização; Nitrogênio; Pastagem; Planta; Respiração; Solo. |
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Thesaurus Nal: |
Bouteloua gracilis; organic matter; soil. |
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Categoria do assunto: |
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Marc: |
LEADER 02125naa a2200313 a 4500
001 1791840
005 2017-04-05
008 1991 bl --- 0-- u #d
100 1 $aHOOK, P. B.
245 $aHeterogeneity of soil and plant N and C associated with individual plants and openings in North American shortgrass steppe.
260 $c1991
520 $aSmall-scale spatial heterogeneity of soil organic matter (SOM) associated with patterns of plant cover can strongly influence population and ecosystem dynamics in dry regions but is not well characterized for semiarid grasslands. We evaluated differences in plant and soil N and C between soil from under individual grass plants and from small openings in shortgrass steppe. In samples from 0 to 5 cm depth, root biomass, root N, total and mineralizable soil N, total and respirable organic C, C: N ratio, fraction of organic C respired, and ratio of respiration to N mineralization were significantly greather for soil under plants than soil from openings. These differences, which were consistent for two sites with constrating soil testures, indicate strong differentiation of surface soil at the scale of individual plants, with relative enrichment of soil under plants in total and active SOM. Between-microsite differences were substantial relative to previously reported differences associated with landscape postiion and grazing intensity in shortgrass steppe. We conclude that microscale heterogeneity in shortgrass steppe deserves attention in invetigation of controls on ecosystem and poapulation processes and when sampling to estimate properties at plot or site scales.
650 $aBouteloua gracilis
650 $aorganic matter
650 $asoil
650 $aMatéria Orgânica
650 $aMineralização
650 $aNitrogênio
650 $aPastagem
650 $aPlanta
650 $aRespiração
650 $aSolo
653 $aGrassland
653 $aNitrogen mineralization
653 $aPlant
653 $aRespiration
700 1 $aBURKE, I. C.
700 1 $aLAUENROTH, W. K.
773 $tPlant and Soil$gv.138, p.247-256, 1991.
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Embrapa Pantanal (CPAP) |
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| 2. |  | ASSIS, J. B. de; LAAT, D. M. de; PEIXOTO, M. G. C. D.; BERGMANN, J. A. G.; FONSECA, C. G.; CARVALHO, M. R. S. Genetic diversity and population structure in Brazilian Mangalarga Marchador horses. Genetics and Molecular Research, v. 8, n. 4, p. 1519-1524, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
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