Seed dynamics of Aeschynomene denticulata and Aeschynomene indica

2021 ◽  
Vol 21 (3) ◽  
pp. 172-180
Author(s):  
Matheus B. Martins ◽  
Taline Fonseca Munhos ◽  
Carlos E. Schaedler ◽  
Dirceu Agostinetto ◽  
André Andres
Keyword(s):  
Seed Dynamics

Scots pine seed dynamics on a waterlogged site

Trees ◽  
2012 ◽  
Vol 26 (4) ◽  
pp. 1305-1315 ◽  
Author(s):  
Tarek A. Mukassabi ◽  
Anthony Polwart ◽  
Tim Coleshaw ◽  
Peter A. Thomas
Keyword(s):  
Scots Pine ◽  
Seed Dynamics

Growth, seed production and effect of defoliation in an early flowering perennial grass, Alloteropsis semialata (Poaceae), on Cape York Peninsula, Australia

2001 ◽  
Vol 49 (6) ◽  
pp. 735 ◽  
Author(s):  
Gabriel M. Crowley ◽  
Stephen T. Garnett
Keyword(s):  
Plant Growth ◽  
Seed Production ◽  
Perennial Grass ◽  
Soil Surface ◽  
Plant Size ◽  
Perennial Grasses ◽  
Wet Season ◽  
Cape York ◽  
Seed Dynamics

Alloteropsis semialata (R.Br.) A.Hitchc. is one of the first perennial grasses in monsoonal Australia to produce seed at the start of the wet season. Patterns of growth and seed production and seed dynamics of Alloteropsis semialata were examined in this study, along with the effects of partial defoliation. Growth of Alloteropsis semialata tussocks started with the first pre-wet-season rains, and was then interrupted during a period with little rain. Growth ceased before the end of the wet season, indicating that factors other than moisture availability were limiting. Seeds of Alloteropsis semialata were germinable on production, but did not remain viable or persist on the soil surface through the dry season. Most seeds and young seedlings were harvested and no seedlings were recruited. Inflorescence production increased with plant size. Moderate defoliation in the early wet season had no impact on plant growth, but reduced inflorescence and seed production for at least 2 years. Absence of a seed bank and early wet-season flowering mean that Alloteropsis semialata is likely to be sensitive to long-term over-grazing.

Pasture seed dynamics in a dry monsoonal climate. I Germination and seedbed environment of Stylosanthes humilis and Digitaria ciliaris

1985 ◽  
Vol 10 (2) ◽  
pp. 135-147 ◽  
Author(s):  
G. M. McKEON ◽  
C. W. ROSE ◽  
J. D. KALMA ◽  
B. W. R. TORSSELL
Keyword(s):  
Stylosanthes Humilis ◽  
Seed Dynamics

Effects of Targeted Grazing and Prescribed Burning on Community and Seed Dynamics of a Downy Brome (Bromus tectorum)–Dominated Landscape

2012 ◽  
Vol 5 (2) ◽  
pp. 259-269 ◽  
Author(s):  
Joel M. Diamond ◽  
Christopher A. Call ◽  
Nora Devoe
Keyword(s):  
Species Composition ◽  
Seed Bank ◽  
Community Dynamics ◽  
Prescribed Burning ◽  
Bromus Tectorum ◽  
Downy Brome ◽  
Stable States ◽  
Targeted Grazing ◽  
Northern Nevada ◽  
Seed Dynamics

AbstractDowny brome (Bromus tectorum L.)—dominated communities can remain as stable states for long periods, even with frequent disturbance by grazing and fire. The objective of this study was to determine the effectiveness of using targeted cattle grazing and late-season prescribed burning, alone and in combination, to reduce B. tectorum seed bank input and seed bank density and thus alter aboveground community dynamics (species composition) on a B. tectorum–dominated landscape in northern Nevada. Cattle removed 80 to 90% of standing biomass in grazed plots in May of 2005 and 2006 when B. tectorum was in the boot (phenological) stage. Grazed and ungrazed plots were burned in October 2005 and 2006. The combined grazing–burning treatment was more effective than either treatment alone in reducing B. tectorum seed input and seed bank density, and in shifting species composition from a community dominated by B. tectorum to one composed of a suite of species, with B. tectorum as a component rather than a dominant. This study provides a meso-scale precursor for landscape-scale adaptive management using grazing and burning methodologies.

Seed dynamics of an endemic palm in a Northwestern Mexican tropical dry forest: implications for population spatial structure

Plant Ecology ◽  
2013 ◽  
Vol 214 (9) ◽  
pp. 1115-1125 ◽  
Author(s):  
Leonel Lopez-Toledo ◽  
Yazmin Portillo-Cruz ◽  
María T. Pulido ◽  
Bryan A. Endress
Keyword(s):  
Spatial Structure ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Seed Dynamics

Seed dynamics of two fire-dependent Geranium species in the boreal forest of southeastern Sweden

Botany ◽  
2012 ◽  
Vol 90 (9) ◽  
pp. 794-805 ◽  
Author(s):  
Lotta Risberg ◽  
Anders Granström
Keyword(s):  
Seed Bank ◽  
Fire Suppression ◽  
Mineral Soil ◽  
Severe Drought ◽  
Humus Layer ◽  
Repeated Sampling ◽  
Viable Seeds ◽  
A Site ◽  
Ballistic Dispersal ◽  
Seed Dynamics

We analyzed critical life-history variables for two rare fire-dependent annual Geranium species in southern Sweden, which are today threatened because of effective fire suppression. At recently burned sites with abundant recruitment, seedlings occurred only where the humus layer had been completely removed by smoldering fire. Emergence depths ranged 1–6 cm in the mineral soil. Soil sampling at four sites revealed that in unburned soil Geranium seeds were located only in the mineral soil. Surprisingly, residual seeds were still present where fire had burned away the humus layer. An experiment showed that both species deposit seeds relatively evenly within a radius of 5–6 m, through ballistic dispersal. Repeated sampling in the field over a 2-year period after seed dispersal at one site indicated a low rate of seed depletion, corroborated by an indoor incubation of seeds. Our results show that successful management of these species depend on deep-burning prescribed fire, which can only result after severe drought. On the other hand, the seed bank is extremely long-lived, as viable seeds were present at a site last burned 200 years ago. This well-protected seed bank will likely buffer against both ill-timed fires and occasional failure in the recruiting seedling populations.

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