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    Author(s): Mohd S. Rahman; Michael G. Messina; Richard F. Fisher
    Date: 2002
    Source: In: Gen. Tech. Rep. SRS-48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pg. 61-65
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (77 KB)

    Description

    Substantial forest acreage in the south-central U.S. is seasonally water-logged due to an underlying fragipan. Severely restricted drainage in the non-growing season leads to a reduced subsoil zone, which restricts root respiration. The same sites may also be subjected to summer drought. These climatic and edaphic problems may result in low seedling survival and reduced growth. To address these issues, we established ten research sites in southern Arkansas. Six sites in an incomplete factorial design were established in 1999, each with four bedded treatments: 1) control (no subsequent treatment), 2) fertilized during the first two years after planting, 3) complete weed control until canopy closure, and 4) complete weed control and continuous fertilization as per foliar analysis; and two non-bedded treatments: 1) control and 2) fertilization and complete weed control in the first year. Water relations data (diurnal water potential, stomatal conductance, and transpiration) and net CO2 assimilation were collected during the 1999 and 2000 growing seasons. This paper will include data from the 2000 growing season. Results to date show improved water relations and gas exchange from intensive culture.

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    Citation

    Rahman, Mohd S.; Messina, Michael G.; Fisher, Richard F. 2002. Water Relations and Gas Exchange of Loblolly Pine Seedlings Under Different Cultural Practices on Poorly Drained Sites in Arkansas. In: Gen. Tech. Rep. SRS-48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pg. 61-65

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