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Grass interference limits resource availability and reduces growth of juvenile red pine in the field

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Abstract

The effects of competing grasses on resource availability, growth and ecophysiological characteristics of 3-0 red pine (Pinus resinosa Ait.) seedlings were examined the first two years following outplanting in Anoka County, Minnesota, USA. Equal numbers of seedlings were planted into suppressed and undisturbed grass communities in a sandy soil. Grass suppression was maintained throughout the first growing season, but partially discontinued thereafter on the site. During the first field season interference from grass reduced pine seedling root collar diameter, needle length, number of new root tips, and lateral root length by over 40%. Mean pre-dawn needle water potential was 0.55 MPa lower in undisturbed grass plots during a brief drought in year one, but otherwise water stress was not significantly (p=0.05) influenced by grass interference. The presence of grass also reduced, up to 50%, the photosynthetically active radiation reaching the seedling canopy. At the end of year one, total biomass N, P, K, and Ca content were significantly (p=0.05) less in seedlings growing in the undisturbed grass community. Nitrogen was deficient in seedlings growing in grass. After two growing seasons, seedling shoot length (p=0.03), root collar diameter (p=0.001), and needle length (p=0.001) were significantly less (40, 54 and 20%, respectively) for seedlings growing in undisturbed grass. Seedling growth reductions induced by grass competition were associated with multiple environmental stressors in the field and not restricted to water stress as was observed in earlier studies with pine species at low and mid-latitude sites.

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Authors and Affiliations

  1. Mt. Hood Community College, 97030, Gresham, OR, USA

    J. M. Caldwell

  2. Department of Forest Resources, University of Minnesota, 55108, St. Paul, MN, USA

    E. I. Sucoff

  3. Environmental Research Laboratory, US EPA, 200 SW 35th Street, 97333, Corvallis, OR, USA

    R. K. Dixon

Authors
  1. J. M. Caldwell
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  2. E. I. Sucoff
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  3. R. K. Dixon
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Caldwell, J.M., Sucoff, E.I. & Dixon, R.K. Grass interference limits resource availability and reduces growth of juvenile red pine in the field. New Forest 10, 1–15 (1995). https://doi.org/10.1007/BF00034173

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