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30 results on '"Van Rees, Ken C.J."'

4. Nitrogen accumulation by conifer seedlings and competitor species from [sup.15]nitrogen-labeled controlled-release fertilizer

Author

Hangs, Ryan D., Knight, J. Diane, and Van Rees, Ken C.J.

Subjects
Conifers -- Environmental aspects, Seedlings -- Research, Nitrogen fertilizers -- Research, Soils -- Nitrogen content, Earth sciences
Abstract

A major impediment to the establishment of outplanted conifer seedlings is competition for available soil N by early successional species. The objective of this field study was to determine the fate of controlled-release fertilizer (CRF) N in soils with outplanted white spruce (Picea glauca [Moench] Voss.) and jack pine (Pinus banksiana Lamb.) seedlings, and the effect of weed control or vegetation management (VM) on fertilizer N accumulation. Nitrogen-15 labeled CRF was placed next to the seedling root plug during planting at four boreal mixed wood sites. After one growing season in the control plots, fertilizer N recovery as a percentage of [sup.15]N added was 4% in seedlings, 3% in competing vegetation, 50% of the fertilizer N remained in the fertilizer bag, presumably remaining available in subsequent seasons. Calamagrostis (Calamagrostis canadensis) was the primary competitor for fertilizer N in both growing seasons, with minor competition from fireweed (Epilobium angustifolium L.), and aspen (Populus tremuloides Michx.). The use of a point source CRF delivery method resulted in high fertilizer use efficiency (FUE), and minimized losses to competing vegetation and leaching.

Published
2003

9. Growth, Survival, and Yields of 30 Short-Rotation Willow Cultivars on the Canadian Prairies: 2nd Rotation Implications

Author

Amichev, Beyhan Y., Volk, Timothy A., Hangs, Ryan D., Bélanger, Nicolas, Vujanovic, Vladimir, Van Rees, Ken C.J., Amichev, Beyhan Y., Volk, Timothy A., Hangs, Ryan D., Bélanger, Nicolas, Vujanovic, Vladimir, and Van Rees, Ken C.J.

Abstract

Willow biomass yields from short-rotation coppice bioenergy systems have been reported across multiple rotations in Europe, USA, and eastern Canada, but data are lacking for the Canadian Prairies. The goal of this study was to evaluate the second rotation biomass yields and stem growth for 30 willow cultivars established in Saskatchewan, Canada in 2007, and coppiced at the end of the first growing season. Detailed stem measurements were collected and all biomass was harvested at the end of the 2010 (first rotation data) and 2013 (second rotation data) growing seasons. The average 3-year cumulative biomass production across all cultivars was 8.1 oven-dry (OD) Mg ha−1 in the second rotation (ranging from 0.6 to 21.3 OD Mg ha−1). The three highest yielding cultivars were Taberg, Tully Champion, and Otisco, with annual production of 6.4–7.1 OD Mg ha−1 year−1 in biomass, which was an increase by 12–44% from the first rotation, and more than double the average for all 30 cultivars (2.7 OD Mg ha−1 year−1), and had an average stool-within-plot survival rate of 81–94%. The 20 lowest clones suffered from higher mortality, which resulted in lower biomass production in the second rotation. These data suggest that the top 10 willow cultivars have a promising potential as a bioenergy source, but more data are needed from the third and successive rotations before a sustainable biomass industry could be established in the Canadian Prairies.

Published
2018

18. Distribution of soil organic carbon in the light and heavy fractions for six shelterbelt species and their adjacent agricultural fields in Saskatchewan.

Author

Dhillon, Gurbir Singh, Van Rees, Ken C.J., and Lupwayi, Newton

Subjects
CARBON sequestration, CARBON in soils, AGROFORESTRY, ORGANIC compound content of soils
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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19. Costs and benefits of shelterbelts: A review of producers' perceptions and mind map analyses for Saskatchewan, Canada.

Author

Rempel, Janell C., Kulshreshtha, Suren N., Amichev, Beyhan Y., Van Rees, Ken C.J., and Chang, S.

Subjects
SOIL erosion, CLIMATE change mitigation, FARM size, GREENHOUSE gases, CARBON dioxide, CARBON sequestration
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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20. The Saskatchewan shelterbelt inventory.

Author

Piwowar, Joseph M., Amichev, Beyhan Y., Van Rees, Ken C.J., and Chang, S.

Subjects
ATMOSPHERIC carbon dioxide, AGROFORESTRY, AGRICULTURAL ecology, SOIL erosion, SOIL respiration, SOIL air
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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21. Greenhouse gas mitigation potential of shelterbelts: Estimating farm-scale emission reductions using the Holos model.

Author

Amadi, Chukwudi C., Van Rees, Ken C.J., Farrell, Richard E., and Chang, S.

Subjects
GREENHOUSE gas mitigation, CARBON sequestration, PLANT spacing, WHITE spruce, BIOMASS
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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22. Carbon sequestration and growth of six common tree and shrub shelterbelts in Saskatchewan, Canada.

Author

Amichev, Beyhan Y., Bentham, Murray J., Kulshreshtha, Suren N., Laroque, Colin P., Piwowar, Joseph M., Van Rees, Ken C.J., and Chang, S.

Subjects
CARBON sequestration, ATMOSPHERIC carbon dioxide, TREE growth, CLIMATE change mitigation, GROWTH curves (Statistics), FOREST density
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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26. Nitrogen uptake characteristics for roots of conifer seedlings and common boreal forest competitor species .

Author

Hangs, Ryan D., Knight, J. Diane, and Van Rees, Ken C.J.

Subjects
TREES, FORESTS & forestry, WHITE spruce, JACK pine, TAIGAS, EPILOBIUM angustifolium
Abstract

Determines the Michaelis?Menten kinetic parameters for white spruce (Picea glauca (Moench) Voss) and jack pine (Pinus banksiana Lamb.) seedlings, and three competitive common boreal forest early successional species: aspen (Populus tremuloides Michx.), fireweed (Epilobium angustifolium L.), and cala magrostis (Calamagrostis canadensis (Michx.) Beauv.). Uptake kinetics that were measured in hydroponic cultures and expressed as maximum uptake and ion affinity; Suggestion that silviculture practices that specifically reduce establishment of this grass should benefit the growth of planted seedlings.

Published
2003
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27. Nitrogen Accumulation by Conifer Seedlings and Competitor Species From [sup 15]Nitrogen-labeled Controlled-Release Fertilizer.

Author

Hangs, Ryan D., Knight, J. Diane, and Van Rees, Ken C.J.

Subjects
NITROGEN, CONIFERS, FERTILIZERS
Abstract

Discusses nitrogen accumulation by conifer seedlings and competitor species from nitrogen-labeled controlled-release fertilizer. Determining the fate of controlled-release fertilizer in soils with outplanted white spruce and jack pine seedlings; Effect of weed control or vegetation management on fertilizer nitrogen accumulation.

Published
2003
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29. Vegetation management and site preparation effects on [sup13]C isotopic composition in planted white spruce[sup1].

Author

Staples, Thomas E., Van Rees, Ken C.J., Knight, J. Diane, and van Kessel, C.

Subjects
*VEGETATION management, *SEEDLINGS, *SOIL moisture
Abstract

Examines the effects of site preparation and vegetation management on white spruce seedlings. Increase in the amount of photosynthetically active radiation reaching the seedlings; Variation in soil moisture; Removal of shaded areas around the seedlings.

Published
2001
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30. Soil temperature effects from minirhizotron lighting systems.

Author

Van Rees, Ken C.J.

Subjects
ROOT development, MINIRHIZOTRONS, PHYSIOLOGICAL effects of ultraviolet radiation
Abstract

Studies the effect of ultraviolet light from minirhizotron system on development and growth of plant roots. Increase in soil temperature due to ultraviolet light exposure; Impact of short duration and long duration light on root development; Chance of alteration in soil fauna activity due to exposure to light.

Published
1998
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