Seed germination of five mountain steppe species of Central Asia

Ronnenberg, Katrin; Wesche, Karsten; Pietsch, Magdalene; Hensen, Isabell

doi:10.1016/j.jaridenv.2007.04.012

Cited by 18 publications

(19 citation statements)

References 16 publications

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“…By that time autumn temperatures are down to 8/4°C, low moisture levels in the field most probably enforce seed quiescence. This has been described for other perennials of dry Central Asian steppes before (Huang and Gutterman 2003;Zheng et al 2004;Wesche et al 2006;Ronnenberg et al 2007).…”

Section: Discussionsupporting

confidence: 57%

Germination ecology of Central Asian Stipa spp: differences among species, seed provenances, and the importance of field studies

2007

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Stipa-species are wide-spread in Central Asia, but sexual reproduction in the dry steppes is rare. To facilitate conservation and restoration of these important rangelands, we studied germination characteristics of three common Mongolian Stipaspecies under field-and lab conditions. Seeds of Stipa krylovii, Stipa gobica and Stipa glareosa were sown at the study site in Southern Mongolia over two consecutive years during which period tests were carried out to ascertain whether competition or herbivory are the main constraints of seedling establishment. In addition, we tested germination and seed viability in the laboratory under two different temperature regimes (20/10°C and 8/4°C), as well as the effect of cold-stratification. The lab experiments also included S. krylovii seeds originating from three climatically different provenances. None of the three Stipa-species seedlings emerged during the first 2 years of the field study. However, after an unusually intense rain event in the third year, 3% of S. krylovii, 0.6% of S. glareosa and 0.1% of S. gobica seeds germinated in the study plots. The factors 'sowing-year' and 'vegetation' significantly affected seedling emergence, whereas grazing had no effect at all. Under laboratory conditions a high percentage of viable seeds of S. gobica and S. glareosa germinated at both incubation temperatures, and cold-stratification had no effect on germination or viability. Germination of S. krylovii seeds required warmer temperatures and cold-stratification had a positive effect. Such evidence for dormancy was more pronounced in seeds from the moister, northern provenances. Germination of Stipa-species in the field is rare and only possible under exceptionally moist conditions. Conservation should thus concentrate on steppe conservation rather than on restoration. Where artificial reseeding is necessary, differences among species and also among different seed provenances should be taken into account.

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Section: Discussionsupporting

confidence: 57%

Germination ecology of Central Asian Stipa spp: differences among species, seed provenances, and the importance of field studies

2007

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“…Seed germination differs in the same family, genus and even for the same species (C. C. Baskin & J. M. Baskin, 1998). That why our findings are more or less similar for example to the seed performances of Artemisia santolinifolia in 32/20 °C regime (Ronnenberg et al, 2007) andA. ordosica, A. sphaerocephala species in 30/20 °C regime (Zheng et al, 2005b;Tobe, Xhang, & Omasa, 2006), but in contrast with other Artemisia species which they gave optimal results in the alternating temperature of 25/15 °C (Huang & Gutterman, 2000;Zheng et al, 2005a;Tobe et al, 2006) and 20/10 °C for A. arenaria (Tobe et al, 2006).…”

Section: Effects Of Temperature Regimesupporting

confidence: 74%

“…The effect of temperature on seed germination is quite complex because it affects each stage of germination process in a different way and is not independent of the other factors (C. C. Baskin & J. M. Baskin, 1998). Alternating and constant temperature have different effects on germination (Ghersa, Arnold, & Martinezghersa, 1992;Zheng et al, 2005b;Ronnenberg, Wesche, Pietsch, & Hensen, 2007;Li, Jiang, Alamusa-Zhou, & Oshida, 2012;Kumar et al, 2013). Alternating…”

Section: Effects Of Temperature Regimementioning

confidence: 99%

“…The increase and decreases of temperature affect the faculty of germination of white Artemisia. Some report indicated that seed germination of some Artemisia species may be constrained by critical environmental factors, such as higher temperature and lower water availability (Tobe, Xiaoming, & Omasa, 2005;Ronnenberg et al, 2007). Seed germination differs in the same family, genus and even for the same species (C. C. Baskin & J. M. Baskin, 1998).…”

Section: Effects Of Temperature Regimementioning

confidence: 99%

“…The germination is a complex process that is controlled by several biological (species, seed viability, seed dormancy, seed size) and environmental (moisture availability, temperature, light intensity and duration) factors (Bewley & Black, 1994). Most investigators working on the seed germination characteristics of some other Artemisia species have reported that light, temperature, chilling are dry storage (assuming that soil moisture is adequate) are some key factors to break dormancy and to achieve germination of Artemisia species (Meyer, Monsen, & McArithur, 1990;Zheng et al, 2005a;Ronnenberg, Wesche, Pietsch, & Hensen, 2007;Kumar, Gupta, Mali, Singh, & Akash, 2013). Alternating and constant temperature have different effects on germination, alternating temperatures simulate the ambient temperature of different seasons and promote germination (Zheng et al, 2005b).…”

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Effect of Various Pre-Treatments and Alternating Temperature on Seed Germination of Artemisia herba-alba Asso

Homrani-Bakali¹

2014

JPS

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The present study was designed to determine the effect of alternating temperature regimes (R) and pre-treatments on the achenes germination of Artemisia herba-alba Asso, in order to provide information about germination requirements to be used for the rehabilitation programs. Four alternating temperature regimes with a day-night cycle (16/8 h) were applied R1: (35-20 °C), R2: (30-15 °C), R3: (25-10 °C) and R4: (20-05 °C) and ten pre-treatments were tested for the best regime. This pre-treatments include the pre-soaking in cool water at two durations, pre-soaking in hot water for two durations, pre-soaking in sulphuric acid (0.1 Mol/l) for two durations, pre-soaking in GA3 (Gibberellic acid) for four hours at three concentrations (10 -5 M, 10 -4 M and 10 -3 M) and mechanical scarification with soft sandpaper. Temperature regimes affect significantly at the level 0.05 the final germination percentage and influence the germination rate. The R2 registered the best performances and the increase and the decrease of the temperature reduces the ability of seeds to germinate. Also, the application of the pre-treatments result in highly significant differences (p < 0.01) for the germination characteristics, basically the pre-soaking in cool water during 48h that gave the best overall percentage of germination (71%). The use of GA3 to promote germination was not significant as compared to control even at the highest concentration (10 -3 M).

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Biological soil crusts increase stability and invasion resistance of desert revegetation communities in northern China

Song

Rong

2020

Ecosphere

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Biological soil crusts (BSCs) in arid region provide critical ecosystem services. However, most previous studies on BSC–plant topic have had a narrow spatiotemporal and taxonomic focus, so context dependency concerning exotic plant responses to BSCs remains poorly understood. In this study, using a series of manipulative experiments under greenhouse conditions, we investigated the influence of BSCs in the Tengger Desert in northern China on seed germination and seedling growth of an exotic grass species, Stipa glareosa P. Smirn., with or without two native plants species, Eragrostis poaeoides Beauv. and Artemisia capillaris Thunb., both of whose ontogeny differs from that of the exotic species. BSC treatments included intact crusts, disturbed crusts, and bare soil. Compared to bare soil, the presence of BSCs reduced the germination of E. poaeoides and A. capillaris by 78% and 74%, respectively. For the exotic species, BSCs reduced the germination percentage by as much as 90%. With gradual increases in soil nutrients such as organic carbon, available phosphorus, and available nitrogen, the shoot biomass of the three plants increased along the sequence from bare soil to lichens and mosses. Shoot biomass of the two native plant species was reduced by the exotic species S. glareosa. The percent germination and shoot biomass of S. glareosa on the disturbed crusts were greater than those on the intact crusts and bare soils. Overall, the presence of BSCs on stabilized sand dunes can reduce the germination of these three plant species, but compared with native plant species, BSCs have a stronger inhibitory effect on the seed germination of the exotic plant species. However, the disturbance may weaken the inhibition of the seed germination of the exotic grass S. glareosa and may provide more nutrients for the exotic grass S. glareosa to establish a revegetation region. We concluded that compared with the absence of BSCs, BSCs in this desert ecosystem can provide more nutrients and a suitable environment for native vascular plants and exert an inhibitory effect on the exotic plants.

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Seed germination of five mountain steppe species of Central Asia

Cited by 18 publications

References 16 publications

Germination ecology of Central Asian Stipa spp: differences among species, seed provenances, and the importance of field studies

Germination ecology of Central Asian Stipa spp: differences among species, seed provenances, and the importance of field studies

Effect of Various Pre-Treatments and Alternating Temperature on Seed Germination of Artemisia herba-alba Asso

Biological soil crusts increase stability and invasion resistance of desert revegetation communities in northern China

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