Forest phenology and a warmer climate - growing season extension in relation to climatic provenance

Canada regenerates more than 400 000 ha of forest land annually through planting and seeding operations. Much of the stock for this effort is selected to be climatically suited to the planting site—a match that is often facilitated through the development of seed zones. However, if climate change proceeds as predicted, stock that is well matched under current climate will be growing in sub-optimal conditions within the next 20 to 50 years—in some parts of the country, trees may already be growing outside their optimal climates. To provide a sense of the magnitude of these changes, we present past and predicted future climate trends for Ontario and British Columbia seed zones. For Ontario, over the period 1950 to 2005, minimum temperature of the coldest month has already increased by up to 4.3°C, growing season has lengthened by up to 6 days, and precipitation during the growing season has increased by up to 26%. Changes were more pronounced across British Columbia’s Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) seed zones, with minimum temperature increasing by up to 8°C, a growing season extension of up to 30 days, and growing season precipitation increases of up to 40%. Projections for the end of the current century include: minimum temperature increase of 5°C to 10°C, growing season extension of 31 to 60 days, and growing season precipitation increases of 3% to 42% across the seed zones in both provinces. These changes are certain to have extensive impacts on forest ecosystems. We briefly discuss 3 forest management adaptation strategies intended to mitigate the negative impacts of climate change in Canada. Key words: climate change, seed zones, British Columbia, Ontario, Douglas-fir, seed transfer, assisted migration

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Rowcovers and High Tunnels Enhance Crop Production in the Northeastern United States

HortTechnology ◽

10.21273/horttech.3.1.92 ◽

1993 ◽

Vol 3 (1) ◽

pp. 92-95 ◽

Cited By ~ 22

Author(s):

Otho S. Wells ◽

J. Brent Loy

Keyword(s):

Return On Investment ◽

Capital Investment ◽

Crop Production ◽

Environmental Control ◽

Growing Season ◽

Management Program ◽

High Tunnel ◽

High Tunnels ◽

Season Extension ◽

Selection Of

Crop growth is enhanced with the use of relatively inexpensive rowcovers and high tunnels. Even though these structures do not provide the same degree of environmental control as greenhouses, they modify the climate sufficiently to lengthen the growing season from 1 to 4 weeks in the spring and 2 to 8 weeks in the fall. Rowcovers generally remain over a crop for 2 to 4 weeks, whereas a high tunnel may function for an entire growing season. Both systems require a relatively low capital investment, provide a good return on investment, and improve the ability of new growers to succeed in the crop production business. The selection of either rowcovers or high tunnels will depend on the management program of a grower; however, both growing systems potentially are economically viable means of season extension.

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Growing season extension affects ozone uptake by European forests

The Science of The Total Environment ◽

10.1016/j.scitotenv.2019.03.020 ◽

2019 ◽

Vol 669 ◽

pp. 1043-1052 ◽

Cited By ~ 11

Author(s):

Alessandro Anav ◽

Alessandra De Marco ◽

Pierre Friedlingstein ◽

Flavia Savi ◽

Pierre Sicard ◽

...

Keyword(s):

Growing Season ◽

European Forests ◽

Ozone Uptake ◽

Season Extension

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Growing season extension and its impact on terrestrial carbon cycle in the Northern Hemisphere over the past 2 decades

Global Biogeochemical Cycles ◽

10.1029/2006gb002888 ◽

2007 ◽

Vol 21 (3) ◽

pp. n/a-n/a ◽

Cited By ~ 336

Author(s):

Shilong Piao ◽

Pierre Friedlingstein ◽

Philippe Ciais ◽

Nicolas Viovy ◽

Jérôme Demarty

Keyword(s):

Carbon Cycle ◽

Northern Hemisphere ◽

Growing Season ◽

Terrestrial Carbon ◽

The Past ◽

Terrestrial Carbon Cycle ◽

Season Extension

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Forward Modeling Reveals Multidecadal Trends in Cambial Kinetics and Phenology at Treeline

Frontiers in Plant Science ◽

10.3389/fpls.2021.613643 ◽

2021 ◽

Vol 12 ◽

Cited By ~ 1

Author(s):

Jan Tumajer ◽

Jakub Kašpar ◽

Hana Kuželová ◽

Vladimir V. Shishov ◽

Ivan I. Tychkov ◽

...

Keyword(s):

Climate Change ◽

Growth Rates ◽

Climatic Factors ◽

Temporal Stability ◽

Growing Season ◽

Cambial Activity ◽

Wood Formation ◽

Spring Phenology ◽

Season Extension ◽

Phenological Phases

Significant alterations of cambial activity might be expected due to climate warming, leading to growing season extension and higher growth rates especially in cold-limited forests. However, assessment of climate-change-driven trends in intra-annual wood formation suffers from the lack of direct observations with a timespan exceeding a few years. We used the Vaganov-Shashkin process-based model to: (i) simulate daily resolved numbers of cambial and differentiating cells; and (ii) develop chronologies of the onset and termination of specific phases of cambial phenology during 1961–2017. We also determined the dominant climatic factor limiting cambial activity for each day. To asses intra-annual model validity, we used 8 years of direct xylogenesis monitoring from the treeline region of the Krkonoše Mts. (Czechia). The model exhibits high validity in case of spring phenological phases and a seasonal dynamics of tracheid production, but its precision declines for estimates of autumn phenological phases and growing season duration. The simulations reveal an increasing trend in the number of tracheids produced by cambium each year by 0.42 cells/year. Spring phenological phases (onset of cambial cell growth and tracheid enlargement) show significant shifts toward earlier occurrence in the year (for 0.28–0.34 days/year). In addition, there is a significant increase in simulated growth rates during entire growing season associated with the intra-annual redistribution of the dominant climatic controls over cambial activity. Results suggest that higher growth rates at treeline are driven by (i) temperature-stimulated intensification of spring cambial kinetics, and (ii) decoupling of summer growth rates from the limiting effect of low summer temperature due to higher frequency of climatically optimal days. Our results highlight that the cambial kinetics stimulation by increasing spring and summer temperatures and shifting spring phenology determine the recent growth trends of treeline ecosystems. Redistribution of individual climatic factors controlling cambial activity during the growing season questions the temporal stability of climatic signal of cold forest chronologies under ongoing climate change.

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Early-season Extension Using June-bearing ‘Chandler’ Strawberry in High-elevation High Tunnels

HortScience ◽

10.21273/hortsci.45.10.1464 ◽

2010 ◽

Vol 45 (10) ◽

pp. 1464-1469 ◽

Cited By ~ 8

Author(s):

Daniel Rowley ◽

Brent L. Black ◽

Dan Drost ◽

Dillon Feuz

Keyword(s):

Root Zone ◽

Growing Season ◽

The United States ◽

High Elevation ◽

Planting Dates ◽

High Tunnel ◽

Small Fruit ◽

High Tunnels ◽

Ground System ◽

Season Extension

High tunnels have been used successfully in many areas of the world to extend the growing season for numerous crops. However, very little research has been conducted to evaluate the season extension benefits offered by high tunnels for small fruit crops in high-elevation growing areas such as the Intermountain West region of the United States. The use of high tunnels was investigated in North Logan, UT (lat. 41.766 N, elev. 1405 m, 119 freeze-free days) to extend the growing season for June-bearing strawberries. Growing systems included a fall-planted annual hill system and vertical growing systems in two different orientations. Optimum planting date for each system was determined by transplanting ‘Chandler’ plugs at 2-week intervals over 10 weeks. For the second year of the study, a field planting was also included. Over two seasons, the optimum planting dates were approximately the first week of September. The vertical systems were more susceptible to winter injury likely resulting from the temperature extremes in the root zone. Where winter injury was prevented, the vertical systems had higher yields per tunnel area than the in-ground system, but yield increases did not compensate for higher construction and management costs. The production window for the in-ground high tunnel planting was ≈4 weeks earlier than the field-grown plants and increased profitability by $13/m2 of tunnel area.

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Growing season

PsycEXTRA Dataset ◽

10.1037/e541672004-001 ◽

1992 ◽

Author(s):

Nicholas Wellington

Keyword(s):

Growing Season

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Irrigation regime and water consumption of potatoes in the Republic of Bashkortostan, depending on the reclamation condition of lands

Melioration and Water Management ◽

10.32962/0235-2524-2019-6-13-19 ◽

2020 ◽

Vol 0 (6) ◽

pp. 13-19

Author(s):

Guzel Gumerova ◽

Georgiy Gulyuk ◽

Dmitry Kucher ◽

Anatoly Shuravilin ◽

Elena Piven

Keyword(s):

Water Consumption ◽

Weather Conditions ◽

Growing Season ◽

Vegetation Period ◽

Forest Steppe ◽

Total Water ◽

Total Water Consumption ◽

Republic Of Bashkortostan ◽

Irrigated Lands ◽

The Republic

Data of long-term researches (2015–2018) in southern forest-steppe zone of the Republic of Bashkortostan, is justified theoretically and experimentally the mode of irrigation of potatoes on leached chernozems of unsatisfactory, satisfactory and good ameliorative condition of irrigated lands. For the growing periods of potatoes with different heat and moisture supply, the number of watering, the timing of their implementation, irrigation and irrigation norms are established. On lands with unsatisfactory meliorative state the number of irrigation depending on weather conditions of potato vegetation period varied from 0 to 3 (1.5 on average) with average irrigation norm – 990 m3/ha. With satisfactory meliorative state of lands the number of irrigation on average increased from 0 to 4 (2.3 on average) with irrigation norm – 1305 m3/ha. On lands with good meliorative state the number of irrigation was the highest – from 1 to 5 (3 on average) with average irrigation irrigation norm is 1653 m3/ha. It was noted that in the dry periods of potato vegetation the greatest number of watering was carried out (3–5 watering), and in the wet periods (2017) watering was not carried out except for the area with a good reclamation state, where only one irrigation was carried out by the norm of 550 m3/ha. Water consumption of potato was studied in dynamics as a whole during the growing season and the months of the growing season depending on weather conditions of vegetation period and land reclamation condition of irrigated lands, as well as in the control (without irrigation). The lowest total water consumption was in the area without irrigation and averaged 226.8 mm. In irrigated areas, its values increased to 319-353.4 mm. The average daily water consumption varied from 2.12 to 3.3 mm. The highest rates of potato water consumption were observed in June and July, and the lowest – in May and August. In the total water consumption of potatoes on the site without irrigation, the largest share was occupied by atmospheric precipitation and in addition to them the arrival of moisture from the soil. Irrigation water was used in irrigated areas along with precipitation, the share of which was 30.2–46.1 %.

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Dynamics of CO2 emission from chernozems under agricultural use

Agricultural science and practice ◽

10.15407/agrisp4.03.043 ◽

2017 ◽

Vol 4 (3) ◽

pp. 43-49

Author(s):

M. Miroshnychenko ◽

O. Siabruk

Keyword(s):

Carbon Dioxide ◽

Agricultural Practices ◽

Growing Season ◽

Warm Period ◽

Direct Seeding ◽

Soil Tillage ◽

Plant Residues ◽

Hydrothermal Conditions ◽

Organic Mineral ◽

Mineral System

Aim. The comparison of the effect of hydrothermal conditions and various agricultural practices on the emission of CO 2 from chernozems in the Left-Bank Forest-Steppe of Ukraine. Methods. The dynamics of the intensity of carbon dioxide emissions from chernozem calcic (typical chernozem – in Ukrainian classifi cation) was studied during the growing season of 2011–2012. The observations were based on two fi eld experiments with various methods of soil till- age (6–7 years from the beginning of the experiment) and fertilization systems (21–22 years from the beginning of the experiment). Particularly, plowing at 20–22 cm, disking at 10–12 cm, cultivation at 6–8 cm and direct seeding using Great Plains drill were studied among the soil tillage methods. Mineral system (N 45 P 50 K 45 ), organic system (manure 8 t/ha) and combined organic-mineral system (manure 8 t/ha + N 45 P 50 K 45 ) were studied among fertilization systems. The intensity of CO 2 fl ux was determined using the non-stationary respiratory chambers by the alkaline absorption method, with averaging of the results during the day and the frequency of once a month. Results. During the warm period, the emission of carbon dioxide from the soil changes dynamically depending on temperature and humidity. The maximum of emission coincides with the periods of warm summer showers in June-July, the minimum values are characteristic for the late autumn period. The total emission losses of carbon in chernozems over the vegetation period ranged from 480 to 910 kg/ha and varied depending on the methods of tillage ± (4.0–6.0) % and fertilization systems ± (3.8–7.1) %. The changes in the intensity of CO 2 emission from the soil under different methods of soil tillage are associated with hydrothermal regime and the depth of crop residues location. The biggest difference is observed im- mediately after tillage, but in the spring period the differences are only 12–25 %, and after drying of the top layer of soil become even less. Direct seeding technology provides the greatest emission of CO 2 from chernozem, which is fa- cilitated by better water regime and more complete mineralization of plant residues on the soil surface. Annual losses of carbon are the least under disking of soil at 10–12 cm. The changes in the intensity of CO 2 emission from the soil under different fertilization systems are associated with the involvement of the additional organic matter from plant residues and manure to the microbiological decomposition. The greatest emission was observed under the organic- mineral fertilization system, which increased the loss of carbon by 7–8 % in comparison with the mineral system in the unfavorable hydrothermal year and by 11–15 % in the more favorable year. These differences are observed mainly during the fi rst half of the growing season when there is a clear tendency to increase the intensity of soil respiration. Conclusions. The hydrothermal conditions of the warm period of the year are decisive in the formation of the CO 2 emission fl ow from chernozems. Due to the improvement of agricultural practices, emissions might be reduced but not more that by 15 % of natural factor contribution.

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