Competitive adaptation by plants to nutrient shortage through modification of root growth and surface charge

Mouat, M. C. H.

doi:10.1080/00288233.1983.10427038

Cited by 19 publications

(11 citation statements)

References 14 publications

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“…Mouat (1983) demonstrated that plants occurring in nutrient-poor environments possessed relatively low cation exchange capacities (CEC). The results suggested that part of the competitive advantage of plants with low CEC (e.g.…”

Section: Competition Mechanismsmentioning

confidence: 99%

“…grasses) was due to their greater increase in root growth in response to low concentrations of nutrients compared with plants with higher CEC (e.g. dicots) (Mouat 1983). Increased root growth and root exploration of soil may confer an important competitive advantage (Evans 1977;Eissenstat & Caldwell 1988).…”

Section: Competition Mechanismsmentioning

confidence: 99%

“…grasses) than for plants having normally high CEC values (e.g. dicots) (McLean 1957;Asher & Ozanne 1961 ;Mouat 1983). Thus, when nutrients are added to soils, grasses can maintain a competitive advantage through a greater increase in their CEC.…”

Section: Competition Mechanismsmentioning

confidence: 99%

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Resource manipulations in natural vegetation: a review

1989

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This paper reviews the effects that resource manipulations, especially nutrient additions, have on productivity, diversity, species interactions and succession in natural and semi-natural low-growth-form terrestrial vegetation. In most studies, fertilization has resulted in an increase in productivity with a concomitant decrease in species diversity. Plant community productivity in nutrient-poor habitats (e.g. arctic tundra) however, has been relatively little affected by nutrient additions. Results from several fertilization experiments in nutrient-poor habitats indicate that competition may be an important component of community dynamics. Resource additions generally do not affect co-occurring species equally. In many cases, this results from an alteration of the relative competitive abilities of species. Several short-term fertilization studies have suggested that the rate of succession is increased by the addition of nutrients. Opposite trends however, have been reported in long-term studies. Contradictory results among some resource manipulation studies appear to stem largely from design limitations (e.g. only one resource was manipulated). Variability in habitat fertility, the type of resource added and the duration of enrichment also contribute to the difficulties involved in interpreting and comparing field experiments. A pluralistic approach combining glasshouse studies with both neighbour and resource manipulations in the field can be expected to lead to a greater depth of understanding of current controversies over the effects of habitat fertility on the intensity of competition and the relationship between competitive ability and tolerance of resource impoverishment.

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Section: Competition Mechanismsmentioning

confidence: 99%

Section: Competition Mechanismsmentioning

confidence: 99%

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Resource manipulations in natural vegetation: a review

1989

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“…Même en cas d'apport d'une fumure de fond, le moindre pouvoir de compétition du trèfle blanc pour P et pour K (Mouat et Walker, 1959 ;Mouat, 1983) pourrait donc intervenir dans l'équilibre des associations semées. Conséquences du niveau de nutrition azotée du ray-grass pour l'équilibre de l'association…”

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Impact de l'association sur le niveau de nutrition azotée et la croissance du ray-grass anglais et du trèfle blanc

Soussana¹,

Arregui²

1995

Agronomie

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“…It is likely that plants treated with no N allocated a greater portion of dry matter to roots relative to shoots. Plants growing in nutrient-poor environments favor allocation of photosynthates to below-ground biomass for the purpose of increasing their root growth to explore larger volume of soil for nutrient absorption (Mouat 1983). The significant N rate × seeding rate interaction effect on S:R ratio, shoot biomass and root biomass indicates that the two barley seeding rates tested in the present study responded differently to the three N rates.…”

Section: Discussionmentioning

confidence: 43%

Shoot-to-root ratios and root biomass of cool-season feed crops in a boreal Podzolic soil in Newfoundland

Kwabiah¹,

Spaner²,

Todd³

2005

Can. J. Soil. Sci.

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. 2005. Shoot-to-root ratios and root biomass of cool-season feed crops in a boreal Podzolic soil in Newfoundland. Can. J. Soil Sci. 85: 369-376. Barley (Hordeum vulgare L.) and oat (Avena sativa L.) crops are grown as feed grains by Newfoundland (NL) dairy farmers. The cereals are either grown as monoculture or intercropped with field pea (Pisum sativum L.) with or without N fertilization. Two experiments were conducted in both 2000 and 2001 to evaluate the shoot-to-root (S:R) weight ratios and root biomass in these production systems. Experiment 1 involved monocultures of pea sown at 150 kg ha -1 , and barley and oat each sown at 170 kg ha -1 . For pea-barley and pea-oat intercrops, pea was sown at 150 kg ha -1 and each cereal component was sown at either 85 and 170 kg ha -1 . The seven treatments were referred to, respectively, as pea 150 150 -oat 170 , indicating that the cereal component of the intercrops contributed more to the root biomass than the pea at the higher seeding rate of the cereal crop. In exp. 2, the 0 kg N ha -1 rate produced the lowest S:R ratios irrespective of the barley seeding rate. When N was applied, both the shoot biomass and root biomass appeared to be increased at the high barley seeding rate. The feed grain production practice in Newfoundland could affect root biomass production in soil. High cereal seeding rates in either monoculture and intercrop systems are required to maximize root biomass production and therefore increase C inputs into the soil . . La culture intercalaire du pois avec les céréales augmente la biomasse des racines de la combinaison pois 150 -orge 85 de 31 % et celle de la combinaison pois 150 -avoine 85 de 48 %, comparativement à celle du pois 150 . Elle s'accroît cependant de 109 % pour la combinaison pois 150 -orge 170 et de 104 % pour pois 150 -avoine 170 , signe que la céréale contribue plus à la production de racines que le pois à la densité de semis plus élevée de la céréale. Dans la deuxième expérience, le taux d'application de 0 kg de N par hectare a donné le plus faible ratio S:R, peu importe la densité de semis de l'orge. L'amendement N semble augmenter la biomasse des pousses et des racines à la plus haute densité de semis de l'orge. La culture de céréales fourragères à Terre-Neuve pourrait modifier la biomasse des racines dans le sol. Une densité de semis élevée pour les céréales cultivées seules ou avec une autre culture maximiserait la production de la biomasse des racines, donc l'apport de C dans le sol.

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Competitive adaptation by plants to nutrient shortage through modification of root growth and surface charge

Cited by 19 publications

References 14 publications

Resource manipulations in natural vegetation: a review

Resource manipulations in natural vegetation: a review

Impact de l'association sur le niveau de nutrition azotée et la croissance du ray-grass anglais et du trèfle blanc

Shoot-to-root ratios and root biomass of cool-season feed crops in a boreal Podzolic soil in Newfoundland

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