Water relation patterns of bare-root and container jack pine and black spruce seedlings planted on boreal cut-over sites |
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| Authors: | Steven C Grossnickle Terence J Blake |
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| Institution: | (1) Faculty of Forestry, University of Toronto, M5S 1A1 Toronto, Ontario;(2) Present address: Agrogen Biotechnologies Inc., Agrogen Building 520 West 6th Avenue, V5Z 4H5 Vancouver, British Columbia |
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| Abstract: | Water relation patterns and subsequent growth were studied on bare-root and container jack pine (Pinus banksiana Lamb.) and black spruce (Picea mariana (Mill.) B.S.P.) seedlings during the first growing season on boreal cut-over sites.Containerized seedlings of both species had greater needle conductance compared to bare-root seedlings over a range of absolute humidity deficits. Needle conductance of containerized seedlings in both species remained high during periods of high absolute humidity deficits and increasing plant moisture stress. Bare-root seedlings of both species had a greater early season resistance to water-flow through the soil-plant-atmosphere continuum (SPAC) than container seedlings. Resistance to water flow through the SPAC decreased in bare-noot seedlings of both species as the growing season progressed, and was comparable to container seedlings 9 through 14 weeks after planting. Four weeks after field planting jack pine container seedlings had greater new root development compared to bare-root seedlings, while at the end of the summer both stock types had similar new root development. Black spruce bare-root seedlings had greater new root development compared with container seedlings throughout the growing season. |
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