Causal soil?plant relationships and path coefficients

Ferrari, T. J.

doi:10.1007/bf01347863

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…The path analysis, a statistical method of testing cause/effect relationships that is mainly used in genetics, is now also used to compare the strength of direct or indirect relationships among variables in plants, soil, and plant–soil relationships323334. In general, the path analysis would permit the partitioning of correlation coefficients into components as path coefficients, to determine the direct or indirect effect35.…”

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confidence: 99%

Direct and indirect effects of glomalin, mycorrhizal hyphae and roots on aggregate stability in rhizosphere of trifoliate orange

Cao

Zou

et al. 2014

Sci Rep

180

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To test direct and indirect effects of glomalin, mycorrhizal hyphae, and roots on aggregate stability, perspex pots separated by 37-μm nylon mesh in the middle were used to form root-free hyphae and root/hyphae chambers, where trifoliate orange (Poncirus trifoliata) seedlings were colonized by Funneliformis mosseae or Paraglomus occultum in the root/hyphae chamber. Both fungal species induced significantly higher plant growth, root total length, easily-extractable glomalin-related soil protein (EE-GRSP) and total GRSP (T-GRSP), and mean weight diameter (an aggregate stability indicator). The Pearson correlation showed that root colonization or soil hyphal length significantly positively correlated with EE-GRSP, difficultly-extractable GRSP (DE-GRSP), T-GRSP, and water-stable aggregates in 2.00–4.00, 0.50–1.00, and 0.25–0.50 mm size fractions. The path analysis indicated that in the root/hyphae chamber, aggregate stability derived from a direct effect of root colonization, EE-GRSP or DE-GRSP. Meanwhile, the direct effect was stronger by EE-GRSP or DE-GRSP than by mycorrhizal colonization. In the root-free hyphae chamber, mycorrhizal-mediated aggregate stability was due to total effect but not direct effect of soil hyphal length, EE-GRSP and T-GRSP. Our results suggest that GRSP among these tested factors may be the primary contributor to aggregate stability in the citrus rhizosphere.

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confidence: 99%

Direct and indirect effects of glomalin, mycorrhizal hyphae and roots on aggregate stability in rhizosphere of trifoliate orange

Cao

Zou

et al. 2014

Sci Rep

180

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“…Tuley (1954). Turner & Stevens (1959), Theil & Goldberger (1961), Ferrari (1963, 1964). and Scott (1966.…”

Section: Relation Siiii' Ljetween Enviitonm Ental Variaule S 27lmentioning

confidence: 99%

Plant ecology above timber line on Mt Ruapehu, North Island, New Zealand

Scott¹

1977

New Zealand Journal of Botany

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“…We used for the calculations the parameter values of Table 1, found in an earlier research (Ferrari, 1963).…”

Section: Fig 1 Model Of the Influences Of 4 Independent Variables (Pr...mentioning

confidence: 99%

Factor analysis of causal models

Ferrari¹,

Mol²

1967

NJAS

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A number of observations was constructed artificially by giving the independent vari ables of a system of equations various values ; in this way the values of the dependent variables could be computed. Next these data have been analysed by factor analyses of which the results were compared with the content of the original model. It appears, that the number of aspects is equal to the number of independent vari ables. It is very difficult to interpret the results of these analyses without rotation. This rotation must be performed according to the caumax method: the possibility to a causal interpretation is maximized by a rotation in which every reference axis is rotated as much as possible upon an independent variable ; the dependent variables are not taken into account. By this an identification of the factor analytical model is obtained. The results are not altered very greatly by error factors and correlations between the independent variables.

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Causal soil?plant relationships and path coefficients

Cited by 8 publications

References 8 publications

Direct and indirect effects of glomalin, mycorrhizal hyphae and roots on aggregate stability in rhizosphere of trifoliate orange

Direct and indirect effects of glomalin, mycorrhizal hyphae and roots on aggregate stability in rhizosphere of trifoliate orange

Plant ecology above timber line on Mt Ruapehu, North Island, New Zealand

Factor analysis of causal models

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