scholarly journals Grazing disturbance increases transient but decreases persistent soil seed bank

2018 ◽  
Vol 28 (4) ◽  
pp. 1020-1031 ◽  
Author(s):  
Miaojun Ma ◽  
Jeffrey l. Walck ◽  
Zhen Ma ◽  
Lipei Wang ◽  
Guozhen Du
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Grazing Disturbance ◽  
Persistent Soil Seed Bank

The role of soil temperature and seed dormancy in the creation and maintenance of persistent seed banks of Nassella trichotoma (serrated tussock) on the Northern Tablelands of New South Wales

2020 ◽  
Vol 42 (2) ◽  
pp. 85
Author(s):  
Annemieke Ruttledge ◽  
Ralph D. B. Whalley ◽  
Gregory Falzon ◽  
David Backhouse ◽  
Brian M. Sindel
Keyword(s):  
Seed Bank ◽  
New South ◽  
Soil Seed Bank ◽  
Seed Banks ◽  
Early Summer ◽  
Secondary Dormancy ◽  
South Wales ◽  
The Creation ◽  
Persistent Soil Seed Bank

A large and persistent soil seed bank characterises many important grass weeds, including Nassella trichotoma (Nees) Hack. ex Arechav. (serrated tussock), a major weed in Australia and other countries. In the present study we examined the effects of constant and alternating temperatures in regulating primary and secondary dormancy and the creation and maintenance of its soil seed bank in northern NSW, Australia. One-month-old seeds were stored at 4, 25°C, 40/10°C and 40°C, in a laboratory, and germination tests were conducted every two weeks. Few seeds germinated following storage at 4°C, compared with seeds stored at 25°C, 40/10°C and 40°C. Nylon bags containing freshly harvested seeds were buried among N. trichotoma stands in early summer, and germination tests conducted following exhumation after each season over the next 12 months. Seeds buried over summer and summer plus autumn had higher germination than seeds buried over summer plus autumn plus winter, but germination increased again in the subsequent spring. Seeds stored for zero, three, six and 12 months at laboratory temperatures were placed on a thermogradient plate with 81 temperature combinations, followed by incubation at constant 25°C of un-germinated seeds. Constant high or low temperatures prolonged primary dormancy or induced secondary dormancy whereas alternating temperatures tended to break dormancy. Few temperature combinations resulted in more than 80% germination.

Persistent soil seed bank and standing vegetation at a high alpine site in the central Chilean Andes

Oecologia ◽  
1999 ◽  
Vol 119 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Lohengrin A. Cavieres ◽  
Carmen Castor ◽  
Mary T. Kalin Arroyo ◽  
Ana María Humaña
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Standing Vegetation ◽  
Persistent Soil Seed Bank ◽  
Chilean Andes

scholarly journals Psychotria hoffmansegiana (Willd ex Roem. & Schult.) Mull. Arg. and Palicourea marcagravii st. Hil. (Rubiaceae): potential for forming soil seed banks in a brazilian Cerrado

2007 ◽  
Vol 67 (3) ◽  
pp. 421-427 ◽  
Author(s):  
CG. Araújo ◽  
VJM. Cardoso
Keyword(s):  
Seed Bank ◽  
Soil Depth ◽  
Soil Seed Bank ◽  
Time Lapse ◽  
Brazilian Cerrado ◽  
Soil Seed Banks ◽  
Paulo State ◽  
Soil Storage ◽  
Different Depths ◽  
Persistent Soil Seed Bank

The germinability of artificially buried Psychotria hoffmansegiana and Palicourea marcagravii seeds in Cerrado soil was tested, with the aim of evaluating whether dispersed seeds may be able to form a soil seed bank. The assays were carried out at a Cerrado Reserve in São Paulo State, Brazil. Seed samples were placed in nylon bags and buried at two different depths and in two different sites. Samples were periodically exhumed and germination tests were performed with both exhumed and dry stored seeds. In general, soil storage favoured seed survival and germination when compared to dry stored seeds. The seed germination was little affected by soil depth and by burial environment. Seeds of both species remained viable for at least 13 months, considering the time lapse between the collection and the end of the germination tests. It was suggested that both species can potentially form a persistent soil seed bank in Cerrado.

Terrain impacts the composition of the persistent soil seed bank: A case study of steep high mountain grasslands in the Greater Caucasus, Georgia

2020 ◽  
Vol 50 (1) ◽  
pp. 47-63
Author(s):  
Giorgi Tedoradze ◽  
George Nakhutsrishvili ◽  
Madeleine Seip ◽  
Tim Theissen ◽  
Rainer Waldhardt ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
High Mountain ◽  
Greater Caucasus ◽  
Mountain Grasslands ◽  
Persistent Soil Seed Bank

Why Engelmann spruce does not have a persistent seed bank

1996 ◽  
Vol 26 (5) ◽  
pp. 872-878 ◽  
Author(s):  
E.A. Johnson ◽  
G.I. Fryer
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Mineral Soil ◽  
Total Rate ◽  
Rapid Loss ◽  
Engelmann Spruce ◽  
Seed Loss ◽  
High Predation ◽  
Persistent Soil Seed Bank ◽  
Persistent Seed Bank

Piceaengelmannii Parry ex Engelm. becomes established after fire by dispersing seeds into a burn, not through the maintenance of a persistent soil seed bank. The objective here was to determine causes of spruce seed loss from the bank to understand its lack of a persistent seed bank. One hundred seeds placed in soil cores were enumerated for 2.5 years and divided into three treatments: (i) varying the amount of protection from predators, (ii) keeping litter intact or removing it, and (iii) placing seeds on top of litter or between litter and mineral soil. For all treatments, fewer than 5% of seeds remained at the end of the study. Predation caused the greatest loss to the seed bank, much greater than germination in all treatments. Removal of litter increased germination, but predation occurred at the same rate; therefore, the total rate of loss to the seed bank increased. Seeds placed between litter and mineral soil experienced greater germination and less predation than seeds placed above the litter layer. However, increased germination balanced the reduced predation so there was little difference in the total rate of loss to the seed bank from seeds placed in either location. Further, seeds appeared to lose viability within two seasons. Thus, there is no persistent seed bank because of high predation and a rapid loss of viability.

scholarly journals Scrutinization of Soil Seed Bank from Arid to Mesic Habitats of Dera Ghazi Khan

2018 ◽  
Author(s):  
Allah Bakhsh Gulshan ◽  
Ali Bakhsh ◽  
Syed Mazhar Irfan ◽  
Sabir Hussain ◽  
Khazir Hayat ◽  
...  
Keyword(s):  
Seed Bank ◽  
Withania Somnifera ◽  
Soil Seed Bank ◽  
Calotropis Procera ◽  
Ground Vegetation ◽  
Land Area ◽  
Chenopodium Murale ◽  
Euphorbia Prostrata ◽  
Persistent Soil Seed Bank ◽  
Soil Habitat

AbstractThe research was conducted to investigate the persistent soil seed bank composition and its relation to the above-ground vegetation of upland area (piedmont) to low land area (alluvial) landscape from arid to mesic region of Dera Ghazi Khan. A transact of 40 kilometers was laid down from arid to mesic habitat. At each 2 km a quadrate of 1 m−2 sizes was thrown in the field to collect a soil sample of 2kg from soil cores ranging 0-15 cm deep for the analysis of soil seed bank. Twenty different sites were sampled by throwing 6 quadrates at each site making a total of 120 samples. Three thousand seeds were obtained of 50 different species from all the collected samples. Soil seed bank density m−2 was higher in the alluvial plains of Dera Ghazi Khan. Most of the perennial species, which were xerophytic in nature such as Aerua persica, Calotropis procera, Fagonia indica, Leptadaenia pyrotechnica, Peganum hermala, Rhazya stricta and Suaeda fructicosa were found in the piedmont (arid) soil habitat and the soil seed bank relatively less than the species found in the alluvial (Mesic) soil habitat, which were mostly of annual life span such as Chenopodium murale, Euphorbia prostrata, Medicago denticulata, Fumaria indica, and Withania somnifera. From this study it is concluded that the similarity found between soil seed bank and above ground vegetation of both historic types of habitats piedmont (arid) and alluvial (mesic) of Dera Ghazi Khan

scholarly journals The Similarity between Species Composition of Vegetation and Soil Seed Bank of Grasslands in Inner Mongolia, China: Implications for the Asymmetric Response to Precipitation

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1890
Author(s):  
Yanyan Lv ◽  
Menghong Shen ◽  
Baoping Meng ◽  
Huifang Zhang ◽  
Yi Sun ◽  
...  
Keyword(s):  
Species Composition ◽  
Transition Zone ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Similarity Index ◽  
Seed Density ◽  
Herbaceous Species ◽  
Asymmetric Response ◽  
Persistent Soil Seed Bank ◽  
Vegetation Species

The asymmetric response of productivity to precipitation was recently proposed as an early warning signal for the shifts in temperate grassland function in China. It was hypothesized that the asymmetry was influenced by the increased growth of the newly emerged seedlings from the soil seed bank. Therefore, the seed density in the soil seed bank and the similarity between species composition of the vegetation and the soil seed bank should be maximized where asymmetry was maximized. However, this knowledge was still limited and unconfirmed. In this study, the desert steppe, typical steppe and the transition zone between them (with the highest asymmetry) were selected for studying the similarity index in both 2018 (dry year) and 2019 (wet year). Plant species composition was monitored in situ using an unmanned aerial vehicle. Soil seed bank samples were collected, and the seed bank density and species composition were then examined and identified in the laboratory. Results showed that: (1) The variation in vegetation species richness between the two years was the highest (41%) in the transition zone (p < 0.05), while it was only 7% and 13% for the desert steppe and typical steppe, respectively. The presence of herbaceous species mainly caused the differences in variation among three grassland types. (2) Seed density was the highest in the transition zone (114 seeds/m2 and 68 seeds/m2 in the transient and persistent soil seed bank, respectively) (p < 0.05). Additionally, herbaceous species were the main components of the soil seed bank. (3) The similarity index was the highest in the transition zone (p < 0.05), with 38%/44% and 33%/44% for the transient/persistent soil seed bank in 2018 and 2019, respectively. Our study demonstrated that variation in vegetation species composition was very similar to the composition of the seeds accumulated in the soil seed bank. These results warrant further investigation for the mechanism of asymmetric response of productivity to precipitation.

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