Competitive effects of various grasses and forbs on ponderosa pine seedlings
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Competition between ponderosa pine seedlings and various grasses and forbs was studied on :I site in northern Arizona burned in 1982 by a wildfire, indicating that competition occurred for both moisture and available nitrogen.Abstract:
Competition between ponderosa pine seedlings and various grasses and forbs was studied on :I site in northern Arizona burned in 1982 by a wildfire Two-yearold pine seedlings were planted in 305 x 305 m plots in April 1983, followed by the sowing of grass and forb seeds on the same plots in July 1983 after summer rains had begun Predawn xylem water potential of the pine seedlings was measured biweekly throughout the 1983 and 1984 growing seasons Extractable soil nitrogen was measured at the beginning and end of both growing seasons After the wildfire, nitrate and ammonium levels were significantly higher in the burned area than in an adjacent unburned area Nitrate and ammonium concentrations in various grass treatment plots were significantly (P < 005) different at both the beginning and end of the growing season Pine seedling xylem water potential differed among treatments, with potentials being lowest on plots sown with Agrtpyron deserrorrr/n The differences in seedling xylem water potential and available soil nitrogen were reflected in differences in pine seedling growth The most effective competitors were Agropym d~~scworwn and Lkwtylk g/o177~~1~71~ Results indicated that competition occurred for both moisture and available nitrogen FOR SCI 33(2):356-366 ADUITIONAIread more
Citations
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Determinants of Plant Distribution: Evidence from Pine Invasions
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Evaluating the Effectiveness Of Postfire Rehabilitation Treatments
TL;DR: A literature review, interviews with key Regional and Forest BAER specialists, analysis of burned area reports, and review of Forest and District monitoring reports were used in the evaluation.
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Physiological ecology of natural regeneration of harvested and disturbed forest stands: implications for forest management
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Postfire Seeding for Erosion Control: Effectiveness and Impacts on Native Plant Communities
TL;DR: The most common post-fire treatments are broadcast seeding of grasses, usually from aircraft as mentioned in this paper, which typically are used to provide quick, temporary ground cover to hold soil in place until native plants are reestablished.
References
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Pseudoreplication and the Design of Ecological Field Experiments
TL;DR: Suggestions are offered to statisticians and editors of ecological journals as to how ecologists' under- standing of experimental design and statistics might be improved.
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Sap Pressure in Vascular Plants: Negative hydrostatic pressure can be measured in plants.
TL;DR: A method is described which permits measurement of sap pressure in the xylem of vascular plants, and finds that in tall conifers there is a hydrostatic pressure gradient that closely corresponds to the height and seems surprisingly little influenced by the intensity of transpiration.
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Modification of the soil environment by vegetation fires, with particular reference to nitrogen transformations: A review
TL;DR: In this article, the authors studied the influence of vegetation burning (ash and heat) on the soil environment and their relation to nutrient availability, and the relationship between ash deposition and soil fertility.
Journal ArticleDOI
Ammonium and nitrate nutrition of plants
R. J. Haynes,K. M. Goh +1 more
TL;DR: In this article, the effects of ammonium plus nitrate as a nitrogen source were investigated and they showed that ammonium toxicity is associated with changes in metabolic changes characteristic of toxicity.
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