The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform

Laura S. Kenefic - One of the best experts on this subject based on the ideXlab platform.

  • Low densities in white pine stands reduce risk of drought-incited decline
    Forest Ecology and Management, 2018
    Co-Authors: William H. Livingston, Laura S. Kenefic
    Abstract:

    Abstract White pine (Pinus strobus) is commonly found in naturally regenerated even-aged stands on former agricultural lands throughout its range. These stands can be managed for rapid production of high-quality sawtimber, and are thus a valuable timber resource. Yet, periodic growth decline and mortality events have occurred, such as that observed in the late 1990s in southern Maine, USA. The present study uses increment measurements from white pine tree cores collected in the early 2000s to compare increment chronologies in high- and low-mortality stands in southern Maine. Periods and severity of decline were quantified, revealing a growth decline and mortality event that began in 1996 following a late-summer drought in 1995. Further, the sites on which mortality was most pronounced were observed to have soil restrictions resulting in shallow rooting depth, ranging from 19 cm to 32 cm deep. Restrictions included bedrock, lithological discontinuity (loamy cap overlaying sand), and Plow Pans. Stand stocking was also a predisposing factor; on average, stands that experienced greater mortality during the decline event had higher stocking than those that experienced less mortality. As a consequence, stand densities in declining stands were reduced through mortality to levels more common in nearby non-decline stands; those densities correspond to recommendations for low-density management of white pine (i.e., 330–540 trees ha−1 and 17–25 m2 ha−1 of basal area at 20–30 cm DBH). The smaller diameters of the affected trees indicate the need to give priority to retention of large-diameter trees when thinning pole- and small sawtimber-sized (20–30 cm DBH) white pine stands. This and other studies demonstrate the need for low-density management of pole-size white pine stands to not only maximize growth and value but also reduce the risk of drought-incited decline and mortality on sites with rooting restrictions.

William H. Livingston - One of the best experts on this subject based on the ideXlab platform.

  • Low densities in white pine stands reduce risk of drought-incited decline
    Forest Ecology and Management, 2018
    Co-Authors: William H. Livingston, Laura S. Kenefic
    Abstract:

    Abstract White pine (Pinus strobus) is commonly found in naturally regenerated even-aged stands on former agricultural lands throughout its range. These stands can be managed for rapid production of high-quality sawtimber, and are thus a valuable timber resource. Yet, periodic growth decline and mortality events have occurred, such as that observed in the late 1990s in southern Maine, USA. The present study uses increment measurements from white pine tree cores collected in the early 2000s to compare increment chronologies in high- and low-mortality stands in southern Maine. Periods and severity of decline were quantified, revealing a growth decline and mortality event that began in 1996 following a late-summer drought in 1995. Further, the sites on which mortality was most pronounced were observed to have soil restrictions resulting in shallow rooting depth, ranging from 19 cm to 32 cm deep. Restrictions included bedrock, lithological discontinuity (loamy cap overlaying sand), and Plow Pans. Stand stocking was also a predisposing factor; on average, stands that experienced greater mortality during the decline event had higher stocking than those that experienced less mortality. As a consequence, stand densities in declining stands were reduced through mortality to levels more common in nearby non-decline stands; those densities correspond to recommendations for low-density management of white pine (i.e., 330–540 trees ha−1 and 17–25 m2 ha−1 of basal area at 20–30 cm DBH). The smaller diameters of the affected trees indicate the need to give priority to retention of large-diameter trees when thinning pole- and small sawtimber-sized (20–30 cm DBH) white pine stands. This and other studies demonstrate the need for low-density management of pole-size white pine stands to not only maximize growth and value but also reduce the risk of drought-incited decline and mortality on sites with rooting restrictions.

Jamie L. Schuler - One of the best experts on this subject based on the ideXlab platform.

  • Planting Techniques for Establishing Loblolly Pine Seedlings onTwo Subsoiled Sites in Arkansas
    Journal of the Arkansas Academy of Science, 2007
    Co-Authors: Jamie L. Schuler
    Abstract:

    Ab.5tract.-The presence of soil compaction and root-restricting layers (e.g., Plow Pans) resulting from long-term agricultural practiccs often poses difficulties when converting these sites into loblolly pine plantations. Subsoiling is usually prescribed to alleviate any problems with soil strength. Subsoiling also creates soil conditions that may aid or hinder planting seedlings. The interaction of planting location. either in the furrow or the adjacent 0.3. 0.9 or 1.5 ft, and planting depth on 2 marginal crop lands was assessed in this study. Planting seedlings in the furrow and deep planting (to the terminal bud) resulted in better growth and increased survival after the first growing scason comparcd to planting outside the furrow and shallow to moderately deep planting. respectively.

Schuler, Jamie L. - One of the best experts on this subject based on the ideXlab platform.

  • Planting Techniques for Establishing Loblolly Pine Seedlings on Two Subsoiled Sites in Arkansas
    ScholarWorks@UARK, 2007
    Co-Authors: Schuler, Jamie L.
    Abstract:

    The presence of soil compaction and root-restricting layers (e.g., Plow Pans) resulting from long-term agricultural practices often poses difficulties when converting these sites into loblolly pine plantations. Subsoiling is usually prescribed to alleviate any problems with soil strength. Subsoiling also creates soil conditions that may aid or hinder planting seedlings. The interaction of planting location. either in the furrow or the adjacent 0.3. 0.9 or 1.5 ft, and planting depth on 2 marginal crop lands was assessed in this study. Planting seedlings in the furrow and deep planting (to the terminal bud) resulted in better growth and increased survival after the first growing season compared to planting outside the furrow and shallow to moderately deep planting. respectivel

J. H. Edwards - One of the best experts on this subject based on the ideXlab platform.