A modelling of the tillering capable of reproducing the fine-scale horizontal heterogeneity of a pure grass sward and its dynamics

Lafarge, Michel; Mazel, Claude; Hill, David R.C.

doi:10.1016/j.ecolmodel.2004.08.003

Cited by 14 publications

(10 citation statements)

References 61 publications

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“…Therefore, the observed higher density of vegetative tillers in these zones at the silage stage (Figures 3 and 5) cannot only be attributed to a direct support by reproductive mother tillers themselves. In the swards studied here, the dynamics of the local high tiller densities can be well reproduced by a spatial model of tillering with a random individual mortality (Lafarge et al. , 2005).…”

Section: Discussionmentioning

confidence: 99%

“…At this date, the Y swards were at the beginning of the second harvest year and the O swards at the beginning of their sixth harvest year. In each of the two recording years, observations were taken at 3-9 d after each cut, in order that live tillers could be easily recognized while remaining within the period before the emergence of new tillers induced by the cut (Davies, 1971;Lafarge et al, 2005).…”

Section: Experimental Treatments and Observationsmentioning

confidence: 99%

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Reproductive tillers in cut tall fescue swards: differences according to sward age and fertilizer nitrogen application, and relationships with the local dynamics of the sward

Lafarge¹

2006

Grass and Forage Science

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The effects of sward age and fertilizer-nitrogen (N) application rate on reproductive tillers and their involvement in the dynamics of swards of perennial grasses were investigated using sown swards of tall fescue (Festuca arundinacea). Treatments included plots representing two sward ages (two and six-year-old swards) and two fertilizer-N rates (150 and 350 kg N ha )1 yr )1 ) on the same experimental field. In each of 2 years all plots were cut at the silage stage and three times afterwards. After each cut, during two growing seasons, the vegetative tillers and stubs of cut reproductive tillers were counted in ten permanent quadrats for each of the four treatments, using a grid of 150 cells, each of 2 cm · 2 cm. The results showed a higher density, and a greater proportion of reproductive tillers, on the higher fertilizer-N rate treatment and on the older swards. The density of vegetative tillers was found to be greater in close proximity to the reproductive tillers in all sward treatments and in both assessment years. Thus, cutting the reproductive tillers did not result in thinning of the swards. It is suggested that a mother-tiller effect, enhancing renewal of tillers, was likely, although zones bearing reproductive tillers during the second spring were sometimes already denser than zones in the rest of the quadrats before the winter.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Treatments and Observationsmentioning

confidence: 99%

Reproductive tillers in cut tall fescue swards: differences according to sward age and fertilizer nitrogen application, and relationships with the local dynamics of the sward

Lafarge¹

2006

Grass and Forage Science

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“…This results in a lower plant/tiller density on a given unit area, which in turn reduces the competition for light. When plant density decreases, plants not only receive more light, but the red/far-red ratio of the light (Lafarge et al, 2005) also changes. This stimulates the axillary meristems to produce new tillers which in turn increases turf cover, despite the number of plants per unit area decreasing.…”

Section: Discussionmentioning

confidence: 96%

Anatomical and morphological factors affecting wear tolerance of turfgrass

Głąb

Szewczyk

Dubas

et al. 2015

Scientia Horticulturae

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“…Such self-imposed heterogeneities may further complicate growth responses through interactive feedbacks (e.g. Lafarge et al 2005, Sheffer et al 2007Gilad et al 2007) and are therefore likely to affect the adaptive values of individual response types in non-trivial ways.…”

Section: Introductionmentioning

confidence: 99%

Fight or flight: plastic behavior under self-generated heterogeneity

Herben

Novoplansky

2010

Evol Ecol

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Plants are able to plastically respond to their ubiquitously heterogeneous environments; however, little is known about the conditions under which plants are expected to avoid or confront their neighbors in dense stands, where heterogeneity is selfgenerated by non-uniform growth and feedback between plant interactions and stand heterogeneity. We studied the role of plasticity for spatial pattern-formation and the resulting stand-level fitness of clonal plants, assuming variable types of plastic behavior. Specifically, the adaptive values of behavior ranging from pure avoidance, to neutral and pure confrontation were assessed using a simulation model of stands of clonally growing plants with varying capacity of plastic behavior. The results demonstrated significant effects of the type of competitive behavior on mean final densities of single-species stands at equilibrium. Density was the lowest and aggregation was the highest in stands of purely confrontational plants, and density was highest in stands of neutral and purely avoiding plants. When competing against a neutral photometer (i.e. non-plastic but otherwise identical plant), the best competitors were plants that avoided their neighbors in 0.33-0.50 of the cases and were neutral otherwise. Differences in adaptive values of individual behaviors depended both on the distance over which the environmental structure (i.e. local density) was perceived, and on overall density. Density-independent ramet mortality profoundly changed the effectiveness of competitive behaviors. Under high levels of mortality, avoidance was the most effective and confrontation the least effective behavior.The results indicate that individual-based behaviors might affect higher organizational levels, and that their reciprocal interactions with resource levels and patchiness, and T. Herben (&) Institute of Botany, Academy of Sciences of the Czech Republic, CZ-252 43 Průhonice, responsiveness to density-independent mortality might generate higher-order feedbacks that intricately affect the fate of individual ramets and the patterning of whole stands and communities.

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A modelling of the tillering capable of reproducing the fine-scale horizontal heterogeneity of a pure grass sward and its dynamics

Cited by 14 publications

References 61 publications

Reproductive tillers in cut tall fescue swards: differences according to sward age and fertilizer nitrogen application, and relationships with the local dynamics of the sward

Reproductive tillers in cut tall fescue swards: differences according to sward age and fertilizer nitrogen application, and relationships with the local dynamics of the sward

Anatomical and morphological factors affecting wear tolerance of turfgrass

Fight or flight: plastic behavior under self-generated heterogeneity

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