Structure and Dynamics of Coenopopulations of Some Temperate Grasses

Жукова, Л.А.; Ermakova, I. M.

doi:10.1007/978-94-009-5500-4_8

Cited by 14 publications

(10 citation statements)

References 1 publication

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“…Grasses tend to move through the grid at a steady rate. A low proportion of seed establishment in grasses (Zhukova & Ermakova 1985) and the absence of long runners are also responsible for this persistence pattern. Some grasses, however, do spread over longer distances, either because of stolons (Poa, Agrostis, Deschampsia) or of seedling establishment (Anthoxanthum) (unpubl.…”

Section: Discussionmentioning

confidence: 99%

Small‐scale spatial dynamics of plant species in a grassland community over six years

Herben

Krahulec

Hadincová

et al. 1993

J Vegetation Science

121

110

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Abstract. In a species‐rich mountain grassland in the Krkonosse Mts., Czechoslovakia, data from four permanent plots of 50 cm x 50 cm were recorded annually from 1985 to 1990 to study the spatial dynamics of the species. Plots were divided into 15 x 15 subplots and the number of vegetative units of all plants within each subplot was determined. There was not much net change at the plot level, but the subplots were very dynamic. Two aspects of the spatial dynamics of the species were followed: (1) persistence, i.e. the tendency of the species to remain in the same subplot, and (2) long‐distance spreading, i.e. movement to subplots beyond the immediate neighbourhood. Species differed widely in their persistence and longdistance spreading and were classified into mobility types: long‐range guerrilla, short‐range guerrilla, phalanx and 'sitting’. The mobility types were, to a certain extent, correlated with the growth form of plants, but some species of one growth form showed different types of small‐scale dynamics and some species with different growth forms had the same spatial dynamics.

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Section: Discussionmentioning

confidence: 99%

Small‐scale spatial dynamics of plant species in a grassland community over six years

Herben

Krahulec

Hadincová

et al. 1993

J Vegetation Science

121

110

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“…That this threshold is a product of the pattern of architectural development in bunchgrasses is evidenced by structural differences observed between the early reproductive (<10 years) and late reproductive stages (>15 years) of bunchgrasses (Gatsuk et al 1980). The age of the oldest restored prairie in this investigation (23 years) coincides with the lower limits of maximum plant longevities for bunchgrasses (2580 years) (Vorontzova & Zaugolnova 1985;Zhukova & Ermakova 1985;Briske & Richards 1995), implying that the oldest plants in this prairie may soon be completely fragmented. Although these data indicate a clear trend in demographic and structural composition of S. scoparium plants, it is unknown whether this is manifest in a change in ecosystem processes and function that may have important ramifications to long-term sustainability of prairie restorations.…”

Section: Discussionmentioning

confidence: 56%

“…These fragments contribute to genet existence and population maintenance (Lord 1993;Danin & Orshan 1995). However, populations of bunchgrasses may also be maintained by reproduction from seed (Vorontzova & Zaugolnova 1985;Zhukova & Ermakova 1985). Yet, seedling establishment of bunchgrasses is dependent on gap disturbances which reduce the interference of established plants through belowground competition (Aguilera & Lauenroth 1993, 1995 and seed availability and soil moisture (O'Connor 1996).…”

Section: Discussionmentioning

confidence: 99%

“…Once this hollow crown is extended to the plant periphery, rapid fragmentation of plants occurs (Gatsuk et al 1980). Fragmentation contributes to population maintenance of bunchgrasses (Lord 1993;Danin & Orshan 1995), although other studies suggest that populations of bunchgrasses are maintained by reproduction from seed (Vorontzova & Zaugolnova 1985;Zhukova & Ermakova 1985). Determining the level of fragmentation of S. scoparium plants along a chronosequence of restored prairies would provide information relevant to the potential self-sustainability of these populations.…”

Section: Introductionmentioning

confidence: 99%

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Structural Attributes of Schizachyrium scoparium in Restored Texas Blackland Prairies

Derner¹,

Polley

Johnson

et al. 2004

Restoration Ecology

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Structural attributes of the C 4 , perennial bunchgrass Schizachyrium scoparium in restored prairies may be affected by the time since restoration. One hundred plants each in 8-, 17-, and 23-year-old restored prairies and a native Texas Blackland prairie were assessed for the presence/absence and diameter of a hollow crown (i.e., dead center portion), degree of fragmentation, plant height, and tiller density. Structural attributes of S. scoparium plants were generally (1) different between recent (8 years) and older (17 and 23 years) restored prairies (2) similar between the 17-and 23-year-old restored prairies, and (3) more similar between the 8-and 17-year restored prairies and the native, remnant prairie than between the 23-year restored prairie and the native prairie. Plants were shorter in restored prairies, regardless of time since restoration, than in the native prairie. Mean basal area of plants was 80163% greater in the 17-and 23-year restored prairies compared with the native and 8-year restored prairies. Percentage of hollow crowns and fragmentation was smallest in the 8-year restored prairie, largest in the 17-and 23-year restored prairies, and intermediate in the native prairie. Tiller density exhibited inverse second-order polynomial decreases with increasing plant basal area for all prairies. In contrast to tiller density, diameter of hollow crowns increased logarithmically with increasing plant basal area. Structural attributes of S. scoparium in restored prairies changed predictably with age, despite growing in different communities.

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“…Panels with the same letters in the middle indicate no difference in size distribution at P = 0.05 (Kolmogorov-Smirnov tests). One argument is that the high fraction of small tussocks of C. sempervirens in the senescent stage could result from dieback and fragmentation of large, ageing tussocks, as observed in several bunchgrasses [26,50]. However, this was unlikely the case in the present study because we treated small ones that were close together and had a more or less continuous base as one large, ageing tussock.…”

Section: Population Levelmentioning

confidence: 85%

Population Dynamics and Within-Tussock-Succession in a Carex sempervirens Subalpine Grassland in the Swiss Alps

Yu¹,

Krüsi²,

Schütz³

et al. 2008

TOFSCIJ

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Tussock-forming graminoids play an important role in high-altitude grasslands. In tussocks many other plant species can grow, forming small communities. However, little is known about such small-scale vegetation, especially during succession. In an abandoned subalpine pasture in the Swiss National Park, we studied population dynamics and within-tussock vegetation of Carex sempervirens in four successional grassland stages (i.e. early, young, mature and senescent) distinguished at community level. At population level, we observed a succession process encompassing both directional and cyclic elements. In agreement with a decrease in grazing pressure and tussock vitality, similarity of the vegetation within tussocks decreased from the early to the senescent stage. Within-tussock vegetation of the early stage was more similar to that of the young stage than to that of the mature and the senescent stage. Fuzzy ordination revealed a similar pathway of succession in C. sempervirens tussocks as observed at community level. We conclude that successional transition from grassland to forest may encompass more than one C. sempervirens cycle and with each cycle floristic composition both inside and outside C. sempervirens tussocks will become more similar to the subsequent forest stage.

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Structure and Dynamics of Coenopopulations of Some Temperate Grasses

Cited by 14 publications

References 1 publication

Small‐scale spatial dynamics of plant species in a grassland community over six years

Small‐scale spatial dynamics of plant species in a grassland community over six years

Structural Attributes of Schizachyrium scoparium in Restored Texas Blackland Prairies

Population Dynamics and Within-Tussock-Succession in a Carex sempervirens Subalpine Grassland in the Swiss Alps

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