Growth and development of the introduced Fraxinus L. species in the taiga zone (Karelia)

Most species of woody plants indigenous to the Russian taiga are extremely sensitive to pollutants. However, many species of deciduous trees that grow in other geographical areas, including the genus Fraxinus, are fairly tolerant to progressive environmental pollution. For the introduction of cultivated plants into new environmental conditions, an impartial assessment of their introduction potential is required, which is possible only on the basis of comprehensive studies. The most important processes characterising the condition of plants are growth and development. The present study examined the introduction of three species of the Fraxinus L. genus to the middle taiga subzone. These were F. excelsior L., F. americana L. and F. pennsylvanica Marsh. The stems and leaves of the plants were measured once every 2–3 days over the course of two growth periods. Phenological observations were carried out between May and October over the course of 17 years. The introduction potential of the studied species was determined through visual assessment carried out in the autumn. The findings showed that the growth of shoots and leaves in the studied Fraxinus species began in late May-early June, varying between species by 1–5 days. The cessation of shoot and leaf growth in the studied Fraxinus species, which occurred in July, varied by up to ten days. The dates of onset and culmination of the growth of shoots and leaves appeared to be determined primarily by air temperature, with a year-by-year variability of 3–7 days. All the studied Fraxinus species showed a high degree of introduction potential and can be successfully used for gardening and landscaping purposes in the middle taiga subzone.

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Growth and Development of Introduced Larix Mill. Species in the Taiga Zone (Karelia)

Journal of Siberian Federal University Biology ◽

10.17516/1997-1389-0341 ◽

2021 ◽

pp. 61-83

Author(s):

Ivan T. Kishchenko

Keyword(s):

Plant Communities ◽

Growth And Development ◽

Growing Season ◽

Botanical Garden ◽

Larix Sibirica ◽

Middle Taiga ◽

Taiga Zone ◽

State University ◽

Residential Landscaping ◽

Phenological Phases

The study reports results of research carried out from April to October during 1988–2016 at the Botanical Garden of Petrozavodsk State University (South Karelia, middle taiga subzones). Three introduced species of the genus Larix (Larix sibirica Ledeb., L. leptolepis (Sieb. et Zucc.) Gord, and L. dahurica Turcz. ex Trautv.) were studied. The growth of shoots and needles in different species begins, reaches its culmination, and ends almost simultaneously, differing by no more than one week across the species. L. sibirica shows the highest growth rate. The timing of growth, culmination, and the dynamics of growth of shoots and needles are largely determined by variations in precipitation, temperature, and humidity. The direction and strength of such an effect may vary from year to year. The dates of phenological phases of the Larix species studied here are chiefly determined by the air temperature in the current growing season and the dates of formation of wintering buds in the previous growing season. Bud swelling and opening begins almost simultaneously in the studied species. Most of the other phenological phases begin and end earliest in L. sibirica and latest in L. leptolepis. All the studied species, primarily L. sibirica, are promising for residential landscaping and creation of artificial plant communities in Karelia

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Analysis of dendroflora of the taras shevchenko park in the city of Ternopil

Naukovì dopovìdì Nacìonalʹnogo unìversitetu bìoresursiv ì prirodokoristuvannâ Ukraïni ◽

10.31548/dopovidi2021.03.010 ◽

2021 ◽

Author(s):

R. B. Dudyn ◽

◽

O. M. Bahatska ◽

M. P. Kurnytsʹka ◽

L. S. Yashchuk ◽

...

Keyword(s):

Woody Plants ◽

Growth And Development ◽

Deciduous Trees ◽

Habitat Conditions ◽

Large Area ◽

Dead Trees ◽

Regional Centers ◽

Favorable Conditions ◽

The City ◽

Trees And Shrubs

The city of Ternopil is one of the regional centers of Ukraine, the rate of landscaping which is one of the highest. Among the plantations of the city with a large area (22,0 hectares) stands out the park of Taras Shevchenko, located on the banks of the Ternopil pond. V.M. Chernyak, V.O. Burma, I.O. Pyatkivsky, R.B. Dudyn, P.P. Tsaryk, S.M. Pidkhovna and others studied the flora of the city of Ternopil and the region. The dendroflora of the park includes 55 taxa of trees, shrubs and vines, which belong to 38 genera and 24 families. The most numerous in terms of number of representatives are the families Rosaceae and Pinaceae. The total number of woody plants is 1836 specimens. The park is significantly dominated by deciduous trees and shrubs (82%). In general, trees make up 77%, of which conifers – 12,4%. All woody plants of the park are phanerophytes, and mesophanerophytes dominate – 62%. In relation to light, light-loving species predominate (68%). 51% of plants are cold-resistant and only 19% are heat-loving. Most of the park's plants are resistant to environmental pollution (only 10% are not gas-resistant). The results of the study of plants in relation to fertility and soil moisture indicate favorable conditions for their growth and development, as most of them show medium and high demands on habitat conditions: 69% are meso- and mesohygrophytes and 56% – megatrophs. Based on the sanitary assessment of the plantations, it was found that about 8,5% of the park's plants have various damages: frost cracks, core rot, coppice, hollows. 8 dead trees were found, 32 specimens need sanitary pruning. 17 plants are recommended for removal for various reasons.

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Introduction of far eastern woody plants to the middle-taiga subzone of the Komi Republic

Contemporary Problems of Ecology ◽

10.1134/s1995425511030052 ◽

2011 ◽

Vol 4 (3) ◽

pp. 260-265 ◽

Cited By ~ 2

Author(s):

L. G. Martynov

Keyword(s):

Woody Plants ◽

Komi Republic ◽

Middle Taiga ◽

Middle Taiga Subzone ◽

Far Eastern

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STOCK OF PLANT MATTER OF THE MEADOW STEPPE OF THE MIDDLE TAIGA ZONE OF YAKUTIA

SCIENTIFIC LIFE ◽

10.35679/1991-9476-2020-15-2-158-166 ◽

2020 ◽

Vol 15 (2) ◽

pp. 158-166

Author(s):

Lia Martynova ◽

Keyword(s):

Middle Taiga ◽

Taiga Zone ◽

Meadow Steppe ◽

Plant Matter

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The Multiscale Monitoring of Peatland Ecosystem Carbon Cycling in the Middle Taiga Zone of Western Siberia: The Mukhrino Bog Case Study

Land ◽

10.3390/land10080824 ◽

2021 ◽

Vol 10 (8) ◽

pp. 824

Author(s):

Egor Dyukarev ◽

Evgeny Zarov ◽

Pavel Alekseychik ◽

Jelmer Nijp ◽

Nina Filippova ◽

...

Keyword(s):

Carbon Cycling ◽

Western Siberia ◽

Carbon Accumulation ◽

Middle Taiga ◽

Taiga Zone ◽

Field Station ◽

Moss Species ◽

Chamber Method ◽

The Impact

The peatlands of the West Siberian Lowlands, comprising the largest pristine peatland area of the world, have not previously been covered by continuous measurement and monitoring programs. The response of peatlands to climate change occurs over several decades. This paper summarizes the results of peatland carbon balance studies collected over ten years at the Mukhrino field station (Mukhrino FS, MFS) operating in the Middle Taiga Zone of Western Siberia. A multiscale approach was applied for the investigations of peatland carbon cycling. Carbon dioxide fluxes at the local scale studied using the chamber method showed net accumulation with rates from 110, to 57.8 gC m−2 at the Sphagnum hollow site. Net CO2 fluxes at the pine-dwarf shrubs-Sphagnum ridge varied from negative (−32.1 gC m−2 in 2019) to positive (13.4 gC m−2 in 2017). The cumulative May-August net ecosystem exchange (NEE) from eddy-covariance (EC) measurements at the ecosystem scale was −202 gC m−2 in 2015, due to the impact of photosynthesis of pine trees which was not registered by the chamber method. The net annual accumulation of carbon in the live part of mosses was estimated at 24–190 gC m−2 depending on the Sphagnum moss species. Long-term carbon accumulation rates obtained by radiocarbon analysis ranged from 28.5 to 57.2 gC m−2 yr−1, with local extremes of up to 176.2 gC m−2 yr−1. The obtained estimates of various carbon fluxes using EC and chamber methods, the accounting for Sphagnum growth and decomposition, and long-term peat accumulation provided information about the functioning of the peatland ecosystems at different spatial and temporal scales. Multiscale carbon flux monitoring reveals useful new information for forecasting the response of northern peatland carbon cycles to climatic changes.

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The growth and development of the leaf in tomato (Lycopersicon esculentum). I. The plastochron index, a suitable basis for description

Canadian Journal of Botany ◽

10.1139/b76-256 ◽

1976 ◽

Vol 54 (21) ◽

pp. 2421-2428 ◽

Cited By ~ 25

Author(s):

Warren K. Coleman ◽

Richard I. Greyson

Keyword(s):

Lycopersicon Esculentum ◽

Seasonal Variability ◽

Growth And Development ◽

Growth Analysis ◽

Growth Habit ◽

Leaf Growth ◽

Growth Stages ◽

Flower Buds ◽

Morphological Status ◽

Plastochron Index

Growth analysis indicates that the plastochron index (PI) is consistently applicable for describing the morphological status of the vegetative tomato shoot in quantitative terms, and pronounced seasonal variability in the growth habit is minimized. However, the PI is not applicable to tomato shoots after flower buds are produced at the vegetative apex. True leaf no. 3 goes through four growth stages which can be characterized in terms of the leaf plastochron index (LPI3). A basipetal trend in leaf growth and development is evident.

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