Influence of temperature, maternal source, and seed position in fruit on seed germination and ability to form soil seed banks in threatened species of Coincya (Cruciferae)

The ecology of hummock-grass vegetation involves recurring fires. The hypothesis was tested that soil seed banks of hummock grass species are stimulated to germinate by the heat of fire or by ash addition. Hummocks of Plectrachne schinzii Henr., Triodia basedowii E. Pritz., and Triodia pungens R. Br. were burned, removed, or removed with the ash returned, and subsequent regeneration was recorded, in Ulum National Park. Regeneration of hummock grass was by seedlings only. Seedling emergence averaged 5/m2, with no differences between treatments or hummock grass species. This indicates the heat of fires and ash addition may not be important in stimulating seed germination of these hummock grass populations. Gemination was distributed over more than one rainfall event following the treatments.

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Impacts of Prosopis juliflora L. on Soil Seed Bank Flora in Amibara Rangeland of Afar Regional State, Ethiopia

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.d-347 ◽

2021 ◽

Author(s):

Ali Noha ◽

Lisanework Nigatu ◽

Rejila Manikandan

Keyword(s):

Seed Germination ◽

Seed Bank ◽

Lower Layer ◽

Soil Seed Bank ◽

Seed Banks ◽

Prosopis Juliflora ◽

Soil Samples ◽

Soil Seed Banks ◽

Regional State ◽

Species Similarity

Background: Prosopis juliflora L. is an evergreen exotic weedy species seriously devastating valuable rangeland resources in arid and semi-arid parts of Ethiopia. Its increasing alarming rate of invasiveness had affecting the livelihood of the pastoral communities in Amibara rangeland of Afar National Regional State. Therefore, the aim of this study was to investigate the effects of Prosopis juliflora L. on soil seed bank flora. Methods: The total of 20 soil samples were collected from five sites by measuring sample quadrats of (20 m × 20 m) area were laid out and the soil samples from each quadrant were taken from 5 sub-quadrats/m2, one from the center and four from the corners, at two depths (0-3 cm and 3-10 cm). The soil samples from the identical layers were mixed in plastic bags to form composite sample. Finally, the composite samples were transported to the Haramaya University to conduct seed germination test in the greenhouse. The soil samples were spread thinly (2 cm thickness) over sterilized soil in shallow trays (20 cm × 25 cm) placed on a bench and allowed for seed germination. Result: The total of 38 herbaceous plant species /m2 belongs to 16 families were emerged in the upper and lower layer (0-3 cm and 3-10 cm) of the soil seed bank samples. The highest values of species diversity were (3.17) in Awash-arba, (3.15) in Alaydagi, (3.04) in Kurkura within m2 area at the depth of 0-3 cm. While the least diversity values of 2.75 in Melka-Werer and 2.77 was recorded in Sarkamo. Jaccard’s coefficient similarity index was exhibited high species similarity of 55.6% in the upper soil seed bank layers (0-3 cm) in Melka-were and Sarkamo. Whereas, species similarities of 45.2% were obtained in the lower layer (3-10 cm) soil seed banks in Awash-arba and upper layer soil seed bank in Alaydagi respectively. While species similarity was decreases as 31.8% in the lower layer soil seed banks in Sarkamo and Kurkura. Increasing species richness and the diversity was also noticed in under open canopy upper layer soil seed bank samples, while decreasing richness and diversity observed in under closed canopy. This indicates that the Prosopis juliflora L. tree has high growth retarding potential on its under canopy soil seed bank flora and in the lower layer soil seed bank samples also.

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Seed Banks, Seed Germination, and Implications for Conservation of the Endangered, Fire-Dependent Shrub, Arctostaphylos morroensis

Natural Areas Journal ◽

10.3375/043.040.0207 ◽

2020 ◽

Vol 40 (2) ◽

pp. 155

Author(s):

Claudia M. Tyler ◽

Dennis C. Odion

Keyword(s):

Seed Germination ◽

Seed Banks

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Effects of Different Dune Positions and Microbiotic Crusts on Soil Seed Banks in the Gurbantonggut Desert

Arid Zone Research ◽

10.3724/sp.j.1148.2008.00107 ◽

2008 ◽

Vol 25 (1) ◽

pp. 107-113

Author(s):

Rong-yi CHEN

Keyword(s):

Seed Banks ◽

Soil Seed Banks ◽

Microbiotic Crusts

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Classification of Post-Fire Responses of Woody Plants to include Pyrophobic Communities

Fire ◽

10.3390/fire3020015 ◽

2020 ◽

Vol 3 (2) ◽

pp. 15 ◽

Cited By ~ 1

Author(s):

Lynda D. Prior ◽

David M. J. S. Bowman

Keyword(s):

Woody Plants ◽

Seed Banks ◽

Classification Systems ◽

Woody Vegetation ◽

General Category ◽

Conifer Species ◽

Soil Seed Banks ◽

Obligate Seeder ◽

In Fire

Developing standardised classification of post-fire responses is essential for globally consistent comparisons of woody vegetation communities. Existing classification systems are based on responses of species growing in fire-prone environments. To accommodate species that occur in rarely burnt environments, we have suggested some important points of clarification to earlier schemes categorizing post-fire responses. We have illustrated this approach using several Australasian conifer species as examples of pyrophobic species. In particular, we suggest using the term “obligate seeder” for the general category of plants that rely on seed to reproduce, and qualifying this to “post-fire obligate seeder” for the narrower category of species with populations that recover from canopy fire only by seeding; the species are typically fire-cued, with large aerial or soil seed banks that germinate profusely following a fire, and grow and reproduce rapidly in order to renew the seed bank before the next fire.

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