Lodgepole Pine and White Spruce Germination: Effects of Stratification and Simulated Aging

Krakowski, Jodie; El‐Kassaby, Yousry A.

doi:10.1515/sg-2005-0021

Cited by 7 publications

(1 citation statement)

References 7 publications

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“…В процесі розвитку генеративних органів та дозрівання насіння в несприятливих екологічних умовах у хвойних, як в природних [22,23], так і в інтродукованих, іноді спостерігаються аномалії, що негативно впливають на якість насіння або призводять до повної втрати їх життєздатності [8,9,26]. Це підтверджується літературними джерелами вітчизняних і зарубіжних авторів з питань репродуктивного розвитку ялин в умовах інтродукції [3,8,11,13] та їх розмноження в умовах in vitro [24,26].При цьому встановлено, що насіннєва продуктивність залежить від життєздатності пилку та впливу техногенних факторів.…”

Section: Sеed Productivity and Quality Of Picea Abies And P Pungens unclassified

Sеed productivity and quality of Picea abies and P. pungens in the Kriviy Rih plantations

Нuseіnova¹

2018

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Reproductive capability is considered as one of indicators of successful introduction; it helps to evaluate adaptation potential of plants, especially in techogenic conditions. The aim of our work is to research morphometric parameters of cones, profitability and seed quality of Рісеа аbies та P. pungens in the plantations with various levels of aerotechnogenic influence in conditions of an industrial city in the steppe zone of Ukraine. The objects of the studying were the cones of 30–40-year-old trees of P. аbies та P. pungens from eight different plantations situated along the whole city of Kryvyi Rih (126 km) and having various levels of technogenic pollution. We revealed that the maximal length of cone in two investigated species (108,4 and 88,7 mm respectively), width (28,6 and 24,7 mm); the highest seedling vigour (41,0 and 7,2 %), laboratory germination (54,2 and 20,6 %), seed mass (6,9 and 4,2 g), and length of germ (18,5 and 13,8 mm) are noted in the trees from Botanical Garden. The minimal values of all the same indices were ascertained for the trees growing near the metallurgical combine “ArcelorMittal Kryvyi Rih”: length of cones – 92,3 and 73,9 mm; width of cones – 26,2 and 22,4 mm; as well as the lowest seedling vigour (2,4 and 1,4 %); laboratory germination (5,0 and 2,0 %), seed mass (5,4 and 3,4 g), and length of germ (12,6 and 5,4 mm). The general seed quantity for a cone of P. аbies та P. pungens, in all the plantation types, varied from 203,9 to 217,2 seeds and from 198,6 to 204,3 ones respectively. The least part of fertile seeds (11,5–13,3 %), and the biggest part of sterile (56,5–58,7 %) and underdeveloped (29,8–30,1 %) ones were noted in the plants of P. pungens directly exposed to emissions of industrial enterprises; for the plants of P. abies the same indices were 20,2–22,5 %; 51,5–52,6 % та 26,0–27,2 % respectively. Therefore, increasing level of techogenic pollution by air pollutants, which is observed during some last years, oppresses the generative sphere of species of genus Рісеа in conditions of the steppe zone of Ukraine.

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Section: Sеed Productivity and Quality Of Picea Abies And P Pungens unclassified

Sеed productivity and quality of Picea abies and P. pungens in the Kriviy Rih plantations

Нuseіnova¹

2018

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A silviculture-oriented spatio-temporal model for germination in Pinus pinea L. in the Spanish Northern Plateau based on a direct seeding experiment

Manso

Calama²,

Madrigal³

et al. 2013

Eur J Forest Res

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Natural regeneration in Pinus pinea stands commonly fails throughout the Spanish Northern Plateau under current intensive regeneration treatments. As a result, extensive direct seeding is commonly conducted to guarantee regeneration occurrence. In a period of rationalization of the resources devoted to forest management, this kind of techniques may become unaffordable. Given that the climatic and stand factors driving germination remain unknown, tools are required to understand the process and temper the use of direct seeding. In this study, the spatio-temporal pattern of germination of P. pinea was modelled with those purposes. The resulting findings will allow us to (1) determine the main ecological variables involved in germination in the species and (2) infer adequate silvicultural alternatives. The modelling approach focuses on covariates which are readily available to forest managers. A two-step nonlinear mixed model was fitted to predict germination occurrence and abundance in P. pinea under varying climatic, environmental and stand conditions, based on a germination data set covering a 5-year period. The results obtained reveal that the process is primarily driven by climate variables. Favourable conditions for germination commonly occur in fall although the optimum window is often narrow and may not occur at all in some years. At spatial level, it would appear that germination is facilitated by high stand densities, suggesting that current felling intensity should be reduced. In accordance with other studies on P. pinea dispersal, it seems that denser stands during the regeneration period will reduce the present dependence on direct seeding.

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2014

Seeds

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Lodgepole Pine and White Spruce Germination: Effects of Stratification and Simulated Aging

Cited by 7 publications

References 7 publications

Sеed productivity and quality of Picea abies and P. pungens in the Kriviy Rih plantations

Sеed productivity and quality of Picea abies and P. pungens in the Kriviy Rih plantations

A silviculture-oriented spatio-temporal model for germination in Pinus pinea L. in the Spanish Northern Plateau based on a direct seeding experiment

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