Skip to Main Content
Competition-Induced Reductions in Soil Water Availability Reduced Pine Root Extension RatesAuthor(s): K.H. Ludovici; L.A. Morris
Source: Soil Sci. Soc. Am. J. 61:1196-1202(1997)
Publication Series: Miscellaneous Publication
PDF: View PDF (210 KB)
DescriptionThe relationship between soil water availability, root extension, and shoot growth of loblolly pine seedlings (Pinus taeda L.) was evaluated in a rhizotron sand mixture in the absence and presence of crabgrass (Digitaria spp.) competition. Heights and diameters of seedlings grown with crabgrass were reduced 33 and SO%, respectively, compared with seedlings grown in pine monoculture. Furthermore, survival of seedlings was reduced by 16% in the mixed species treatments compared with pine monoculture cells. Soil water contents at all depths were at least 50% lower in mixed species treatments com- pared with pine monocultures during a dry-down cycle. Maximum loblolly pine root extension rate was 0.10 m wk-1 in pine monoculture compared with 0.02 m wk-1 in the presence of grass. Pine seedling root extension ceased in the presence of grass during prolonged periods of induced water stress. Crabgrass roots extended at a rate of 0.6 m wk-1, a rate largely unaffected by watering regime or differences in water content within the rhizotron. Pine root distributions, at the end of one growing season, were different for seedlings grown with grass than for those in pine monoculture; however, when seedlings of similar size were compared, root distributions were not different. Our results indicate that competition-induced reductions in soil water availability reduced the rate of pine root extension and thus the volume of soil exploited, thereby reducing resource availability and tree growth.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLudovici, K.H.; Morris, L.A. 1997. Competition-Induced Reductions in Soil Water Availability Reduced Pine Root Extension Rates. Soil Sci. Soc. Am. J. 61:1196-1202(1997)
- Responses of loblolly pine, sweetgum and crab grass roots to localized increases in nitrogen in two watering regimes
- Techniques for establishing vegetation for long-term erosion control on disturbed slopes in Alabama
- Quality and yield of seven forages grown under partial shading of a simulated silvopastoral system in east Texas
XML: View XML