Soil Variability—A Serious Problem in Soil‐Site Studies in the Northeast

Mader, Donald L.

doi:10.2136/sssaj1963.03615995002700060040x

Cited by 45 publications

(21 citation statements)

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“…Because of problems associated with large numbers of samples (cost, analysis, transport, etc. ), several authors have noted that when studying other highly variable soil properties (i.e., some forest elemental concentrations, rockfragment content), compositing is often necessary to reduce within-plot variability (Mader 1963;Courtin et al 1983). …”

Section: Variability Within Plotsmentioning

confidence: 99%

Soil physical property changes at the North American Long-Term Soil Productivity study sites: 1 and 5 years after compaction

Page‐Dumroese¹,

Jürgensen²,

Tiarks³

et al. 2006

Can. J. For. Res.

145

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Abstract:The impact of forest management operations on soil physical properties is important to understand, since management can significantly change site productivity by altering root growth potential, water infiltration and soil erosion, and water and nutrient availability. We studied soil bulk density and strength changes as indicators of soil compaction before harvesting and 1 and 5 years after harvest and site treatment on 12 of the North American Long-Term Soil Productivity sites. Severe soil compaction treatments approached root-limiting bulk densities for each soil texture, while moderate compaction levels were between severe and preharvest values. Immediately after harvesting, soil bulk density on the severely compacted plots ranged from 1% less than to 58% higher than preharvest levels across all sites. Soil compaction increases were noticeable to a depth of 30 cm. After 5 years, bulk density recovery on coarse-textured soils was evident in the surface (0-10 cm) soil, but recovery was less in the subsoil (10-30 cm depth); fine-textured soils exhibited little recovery. When measured as a percentage, initial bulk density increases were greater on finetextured soils than on coarser-textured soils and were mainly due to higher initial bulk density values in coarse-textured soils. Development of soil monitoring methods applicable to all soil types may not be appropriate, and more sitespecific techniques may be needed for soil monitoring after disturbance. 564Résumé : Il est important de comprendre l'impact des interventions dictées par l'aménagement forestier sur les propriétés physiques du sol étant donné qu'elles peuvent modifier de façon significative la productivité d'une station en altérant le potentiel de croissance des racines, l'infiltration d'eau, l'érosion du sol et la disponibilité de l'eau et des nutriments. Les auteurs ont étudié les changements dans la résistance et la densité apparente du sol en tant qu'indicateurs de la compaction du sol avant la récolte ainsi qu'un et 5 ans après la récolte et la préparation du terrain dans 12 stations du projet nord-américain de productivité des sols à long terme. Les traitements de compaction sévère du sol s'approchaient de la densité apparente inappropriée pour les racines pour chaque texture de sol alors que les degrés modérés de compaction du sol se situaient entre des valeurs allant de sévères à celles obtenues avant la récolte. Immédiatement après la récolte dans les parcelles où la compaction du sol était sévère, la densité apparente du sol variait de 1 % moins élevée à 58 % plus élevée qu'avant la récolte pour l'ensemble des sites. L'augmentation de la compaction du sol était observable jusqu'à une profondeur de 30 cm. Après 5 ans, le rétablissement de la densité apparente dans les sols à texture grossière était évident en surface (0-10 cm) mais pas aussi évident en profondeur (10-30 cm); presque aucun rétablissement n'était apparent dans les sols à texture fine. Mesurée en pourcentage, l'augmentation de la densité apparente initiale était plus for...

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Section: Variability Within Plotsmentioning

confidence: 99%

Soil physical property changes at the North American Long-Term Soil Productivity study sites: 1 and 5 years after compaction

Page‐Dumroese¹,

Jürgensen²,

Tiarks³

et al. 2006

Can. J. For. Res.

145

View full text Add to dashboard Cite

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“…Sobre isso, já em 1918, Batchelor & Reed, citados por Harris (1920), alertavam para a variabilidade observada na produção de árvores cítricas. Em área cultivada com Pinus resinosa Ait., Mader (1963) verificou grande variabilidade do solo, ocorrendo o mesmo com Slay et al (1986) que, inclusive, demonstraram como ela pode mascarar ou levar a uma interpretação errônea dos efeitos dos tratamentos em um ensaio.…”

Section: Introductionunclassified

Variabilidade de propriedades físicas e químicas do solo em um pomar cítrico

Souza

Cogo

Vieira

1997

Rev. Bras. Ciênc. Solo

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RESUMOObjetivando fornecer subsídios para esquemas de amostragem e planejamento de experimentos com citros, avaliou-se, em 1990, a variabilidade de propriedades físicas e químicas do solo em uma transeção de 50 plantas espaçadas de 4 m, em um pomar de laranja 'Pêra' com doze anos de idade, sob manejo uniforme e implantado em um latossolo amarelo distrófico textura média relevo plano, em Governador Mangabeira (BA). Em cada planta, colheu-se uma amostra de solo em um ponto fixo sob a projeção da copa, em faixa sucessivamente adubada. Os resultados permitiram concluir que apenas fósforo e umidade gravimétrica apresentaram distribuição normal, com as demais propriedades seguindo a lognormal. Os maiores coeficientes de variação foram obtidos para potássio e fósforo e, os menores, para saturação por bases, pH em CaCl 2 , pH em água e areia total. Com exceção de saturação por bases e alumínio, que apresentaram distribuição aleatória, as demais propriedades mostraram dependência espacial, com alcance variando de 18 m (areia total e argila) a 59 m (matéria orgânica, cálcio, magnésio, Ca + Mg e soma de bases).Termos de indexação: distribuição de freqüência, coeficiente de variação, geoestatística, semivariograma, dependência espacial, amostragem de solo. SUMMARY: VARIABILITY OF PHYSICAL AND CHEMICAL PROPERTIES OF A LATOSOL UNDER AN ORANGE ORCHARD

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“…and vertical variability associated with forest soils (Mader 1963;Quesnel and Lavkulich 1980;Courtin et al 1983 (Lautzenheizer 1972 Sultur Determinator (SC 132); and SOa-S by extraction in deionized water ("water soluble SOa") and 0.016 M NaH2PO4 ("adsorbed SOo").…”

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confidence: 99%