The presence of invasive grasses affects the soil seed bank composition and dynamics of both invaded and non-invaded areas of open savannas

2020 ◽  
Vol 276 ◽  
pp. 111291
Author(s):  
Mariana Dairel ◽  
Alessandra Fidelis
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Invasive Grasses

Light affects the germination and normal seedling development of Neotropical savanna grasses

2020 ◽  
pp. 1-4
Author(s):  
Claudiana M. Pereira ◽  
Rebeca N.A. Figueirôa ◽  
Hudson G.V. Fontenele ◽  
Heloisa S. Miranda
Keyword(s):  
Invasive Species ◽  
Seed Bank ◽  
Native Species ◽  
Seedling Recruitment ◽  
Soil Seed Bank ◽  
Light Availability ◽  
Native Grasses ◽  
Neotropical Savanna ◽  
Invasive Grasses ◽  
Biomass Component

Abstract The Cerrado is a Neotropical savanna where grasses are a major biomass component in the open vegetation physiognomies. Invasive grasses are widely used as pastures in the Cerrado, and their presence may displace native species. The persistence of native grasses relies also on reproduction via seeds, which is often dependent on seeds found buried in the soil seed bank. The literature about the effects of light availability on the germination of Neotropical savanna grasses is scarce, and germination may lead to abnormal seedlings that develop only the root or the shoot. Germination trials that overlook this fact may overestimate the potential for seedling recruitment. Therefore, we tested the effects of light availability on the germination of nine native and two invasive grasses, addressing the production of normal seedlings. Seeds were germinated in the complete absence or the presence of light (12 h photoperiod under white light) for 30 days. Germination was defined as the sum of normal and abnormal seedlings. Eight species were light-dependent, decreasing the production of normal seedlings in the dark. Two native and one invasive species were non-responsive to the dark treatment, showing no change in germination or production of normal seedlings. Our results suggest that seeds buried in the soil seed bank are likely to show reduced germination and develop abnormal seedlings, reinforcing a bottleneck for the recruitment of native grasses. For invasive species, however, the potential of seedling recruitment was minimally reduced by light, suggesting a competitive advantage for the recruitment of these species.

scholarly journals The role of Pteridium arachnoideum(Kaulf) on the seed bank of the endangered Brazilian Cerrado

2016 ◽  
Vol 76 (1) ◽  
pp. 256-267 ◽  
Author(s):  
R. O. Xavier ◽  
J. G. Alday ◽  
R. H. Marrs ◽  
D. M. S. Matos
Keyword(s):  
Seed Bank ◽  
Management Strategy ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Common Species ◽  
Ground Vegetation ◽  
Brazilian Cerrado ◽  
Invasive Grasses ◽  
The Relationship

Abstract The native bracken (Pteridium arachnoideum) often occurs in mono-specific stands in the Brazilian Cerrado, and this dominance can impact on both the above-ground vegetation and soil seed bank. This study investigated how invasion by this species over a 20-year period changed the seed bank and the relationship between the seed bank and litter mass. We extracted soil samples from three replicated invaded and uninvaded sites, and followed seedling emergence for six months. We collected the above-ground biomass and litter of P. arachnoideum in ten 1m2 plots from three invaded sites. There was no difference between invaded and uninvaded areas in seed bank richness, diversity or overall abundance. The most abundant family was the Melastomataceae, followed by the Poaceae. The Melastomataceae was more abundant in uninvaded sites, but the most common species of this family (Tibouchinastenocarpa) was not affected. The grasses were more common in invaded sites in the rainy season and were affected by heterogeneity in the litter layer. The seed bank could play a role in the recovery of these invaded areas, but the presence of weeds and invasive grasses could constrain their use as a management strategy.

Characteristics of Soil Seed Bank of Caragana microphylla Community under the Grazing and Enclosure Conditions in Horqin Sandy Land

2010 ◽  
Vol 26 (5) ◽  
pp. 714-719
Author(s):  
Ming LI ◽  
De-ming JIANG ◽  
Yong-ming LUO ◽  
Xiu-mei WANG ◽  
Bo LIU ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Horqin Sandy Land ◽  
Sandy Land ◽  
Caragana Microphylla

Community Dynamics and Soil Seed Bank Ecology of Lane Mountain Milkvetch (Astragalus jaegerianus Munz)

2012 ◽  
Author(s):  
T. R. Huggins ◽  
B. A. Prigge ◽  
M. R. Sharifi ◽  
P. W. Rundel
Keyword(s):  
Seed Bank ◽  
Community Dynamics ◽  
Soil Seed Bank

scholarly journals Effects of Wollastonia biflora expansion on the soil seed bank in native forest communities on a tropical coral island

2021 ◽  
Vol 25 ◽  
pp. e01403
Author(s):  
Yao Huang ◽  
Hai Ren ◽  
Jun Wang ◽  
Nan Liu ◽  
Shuguang Jian ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Native Forest ◽  
Forest Communities ◽  
Tropical Coral ◽  
Coral Island

scholarly journals Influence of Slope Direction on the Soil Seed Bank and Seedling Regeneration of Castanopsis hystrix Seed Rain

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 500
Author(s):  
Zong Zhao ◽  
Yong Liu ◽  
Hongyan Jia ◽  
Wensheng Sun ◽  
Angang Ming ◽  
...  
Keyword(s):  
Seed Bank ◽  
Temporal Dynamics ◽  
Soil Seed Bank ◽  
Soil Layer ◽  
Seed Rain ◽  
Seed Vigor ◽  
Study Results ◽  
The Impact ◽  
Mature Seeds

Objective: To investigate the impact of different slope directions on the quantity and quality of the soil seed bank and seedling germination process of Castanopsis hystrix plantations. Method: Fixed sample plots in forest stands of Castanopsis hystrix were established on different slope directions (sunny slope, semi-sunny slope, semi-shady slope, and shady slope). The characteristics of the forest stand were investigated, and per-wood scaling was carried out. The temporal dynamics of the seed rain and seed bank were quantified using seed rain collectors and by collecting soil samples from different depths. The quantity and quality of the seeds were determined, and the vigor of mature seeds was measured throughout the study. Results: (1) The diffusion of Castanopsis hystrix seed rain started in mid-September, reached its peak from late October to early November, and ended in mid-December. (2) The dissemination process, occurrence time, and composition of the seed rain varied between the different slope directions. The seed rain intensity on the semi-sunny slope was the highest (572.75 ± 9.50 grains∙m−2), followed by the sunny slope (515.60 ± 10.28 grains∙m−2), the semi-shady slope (382.13 ± 12.11 grains∙m−2), and finally the shady slope (208.00 ± 11.35 grains∙m−2). The seed rain on the sunny slope diffused earliest and lasted the longest, while the seed rain on the shady slope diffused latest and lasted the shortest time. Seed vigor and the proportion of mature seeds within the seed rain were greatest on the semi-sunny slope, followed by the sunny slope, semi-shady slope, and the shady slope. (3) From the end of the seed rain to August of the following year, the amount of total reserves of the soil seed banks was highest on the semi-sunny slope, followed by the sunny slope then the semi-shady slope, and it was the lowest on the shady slope. The amount of mature, immature, gnawed seeds and seed vigor of the soil seed bank in various slope directions showed a decreasing trend with time. The seeds of the seed bank in all slope directions were mainly distributed in the litter layer, followed by the 0–2 cm humus layer, and only a few seeds were present in the 2–5 cm soil layer. (4) The seedling density of Castanopsis hystrix differed significantly on the different slope directions. The semi-sunny slope had the most seedlings, followed by the sunny slope, semi-shady slope, and the shady slope. Conclusions: The environmental conditions of the semi-sunny slope were found to be most suitable for the seed germination and seedling growth of Castanopsis hystrix, and more conducive to the regeneration and restoration of its population.

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