Control of soil phosphatase activities at millimeter scales in a mixed paper birch – Douglas-fir forest: The importance of carbon and nitrogen

2015 ◽  
Vol 80 ◽  
pp. 62-69 ◽  
Author(s):  
Aaron M. Godin ◽  
Kiran K. Lidher ◽  
Matthew D. Whiteside ◽  
Melanie D. Jones
Keyword(s):  
Douglas Fir ◽  
Phosphatase Activities ◽  
Carbon And Nitrogen ◽  
Paper Birch ◽  
Soil Phosphatase

Fluorescent pseudomonad population sizes baited from soils under pure birch, pure Douglas-fir, and mixed forest stands and their antagonism towardArmillaria ostoyaein vitro

2002 ◽  
Vol 32 (12) ◽  
pp. 2146-2159 ◽  
Author(s):  
R L DeLong ◽  
Kathy J Lewis ◽  
Suzanne W Simard ◽  
Susan Gibson
Keyword(s):  
Douglas Fir ◽  
Fluorescent Pseudomonads ◽  
Dual Culture ◽  
Fluorescent Pseudomonad ◽  
Percent Cover ◽  
Forest Stands ◽  
Mixed Stands ◽  
Relative Population ◽  
Population Sizes ◽  
Paper Birch

The relationship between forest stand composition in southern interior British Columbia and fluorescent pseudomonad bacteria populations was investigated using seedling bioassays. The objectives of this study were to (i) compare the relative population sizes of fluorescent pseudomonads baited from soils in pure paper birch (Betula papyrifera Marsh.), pure Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), and mixed stands of the two species and (ii) determine if fluorescent pseudomonads from these soils have inhibitory effects against the root pathogen Armillaria ostoyae (Romagn.) Herink in vitro. Soil from birch stands supported four times more pseudomonads on seedling baits than soil from Douglas-fir stands, with the mixed stands intermediate. Soil from young stands yielded twice as many rhizosphere pseudomonads as soil from mature stands. Pseudomonad population size was positively correlated with percent cover and density of birch, and negatively correlated with basal area of Douglas-fir, percent cover of Douglas-fir, and carbon/nitrogen ratio of the soil. Greater than 50% of the fluorescent isolates reduced radial growth of A. ostoyae by more than 20% and greater than 90% reduced biomass of the fungus in dual culture tests. Cell-free bacterial culture filtrates added to the growth medium also reduced growth of A. ostoyae. This study provides evidence that paper birch provides a more favorable environment for fluorescent pseudomonads than Douglas-fir and suggests a mechanism by which paper birch can positively influence the susceptibility of managed forest stands to Armillaria root disease.

Estimating tree biomass, carbon, and nitrogen in two vegetation control treatments in an 11-year-old Douglas-fir plantation on a highly productive site

2013 ◽  
Author(s):  
Warren D. Devine ◽  
Paul W. Footen ◽  
Robert B. Harrison ◽  
Thomas A. Terry ◽  
Constance A. Harrington ◽  
...  
Keyword(s):  
Douglas Fir ◽  
Biomass Carbon ◽  
Tree Biomass ◽  
Vegetation Control ◽  
Carbon And Nitrogen ◽  
Tree Biomass Carbon

Ectomycorrhizal colonization of greenhouse-grown Douglas-fir (Pseudotsuga menziesii) seedlings by inoculum associated with the roots of refuge plants sampled from a Douglas-fir forest in the southern interior of British Columbia

2004 ◽  
Vol 82 (6) ◽  
pp. 742-751 ◽  
Author(s):  
Shannon M Hagerman ◽  
Daniel M Durall
Keyword(s):  
British Columbia ◽  
Pseudotsuga Menziesii ◽  
Populus Tremuloides ◽  
Arbuscular Mycorrhizal ◽  
Douglas Fir ◽  
Fungal Colonization ◽  
Inoculum Potential ◽  
Paper Birch ◽  
Salix Bebbiana ◽  
Ectomycorrhizal Morphotypes

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were grown in the greenhouse in a sterilized mixture of forest soil and vermiculite, which had been inoculated with root fragments from one of six different ectomycorrhizal under story plant species (Arctostaphylos uva-ursi (L.) Spreng, P. menziessi, Salix bebbiana Bebb, Alnus viridis subsp. sinuata (Regel) Ä. Löve & and D. Löve (alder), Betula papyrifera Marsh. (paper birch), Populus tremuloides Michx.) and arbuscular mycorrhizal Calamagrostis rubescens Buckl. (pinegrass) sampled from a dry Douglas-fir forest in the southern interior of British Columbia. The overall objective of the present study was to investigate the inoculum potential of these ectomycorrhizal roots for colonizing Douglas-fir seedlings. A total of seven ectomycorrhizal morphotypes formed on the bioassay seedlings, which were colonized by all treatments except the control. Seedlings growing in soil inoculated with root fragments of Douglas-fir, Arctostaphylos, and paper birch had greater ectomycorrhizal richness and a higher percentage of colonized fine roots relative to the pinegrass and alder treatments. The community of ectomycorrhizal fungi that colonized the bioassay seedlings differed from that associated with some of the same refuge plants assessed in a previously reported field-based study at this site. Different ectomy corrhizal fungal colonization strategies and the retention of refuge plants are discussed in relation to the colonization of outplanted seedlings following clearcutting.Key words: ectomycorrhizae, refuge plants, inoculum potential, soil bioassay, Pseudotsuga menziesii.

Response of soil phosphatase activities to contamination with two types of tar oil

2018 ◽  
Vol 25 (28) ◽  
pp. 28642-28653 ◽  
Author(s):  
Arkadiusz Telesiński ◽  
Teresa Krzyśko-Łupicka ◽  
Krystyna Cybulska ◽  
Jacek Wróbel
Keyword(s):  
Phosphatase Activities ◽  
Tar Oil ◽  
Soil Phosphatase

scholarly journals Humus conditions of stands with different proportion of Douglas fir in the Hůrky Training Forest District and Křtiny Training Forest Enterprise

2009 ◽  
Vol 55 (No. 8) ◽  
pp. 345-356 ◽  
Author(s):  
L. Menšík ◽  
J. Kulhavý ◽  
P. Kantor ◽  
M. Remeš
Keyword(s):  
Chemical Composition ◽  
Acid Site ◽  
Forest Floor ◽  
Total Content ◽  
Acid Sites ◽  
Douglas Fir ◽  
Soil Reaction ◽  
Carbon And Nitrogen ◽  
Beech Stand ◽  
Forest District

The paper presented evaluates reserves and chemical composition of forest floor of three stands of Douglas fir, spruce and spruce with beech at acid sites (3K) in the Hůrky Training Forest District (TFD) and at a meso-trophic site (4H) in the Křtiny Training Forest Enterprise (TFE). The aim of the study was to evaluate: (<I>i</I>) reserves of forest floor, (<I>ii</I>) soil reaction, (<I>iii</I>) total content of carbon and nitrogen for the forest floor layers, <I>iv</I>) C/N ratio, and (<I>v</I>) the content of dissolved organic carbon (DOC). The lowest reserve occurs in the Douglas fir stand at a mesotrophic site (25.0 t/ha), the highest accumulation occurs in the spruce stand and in the spruce/beech stand at an acid site (79.4–79.6 t/ha). The soil reaction is strongly acid to acid. The most favourable values of pH for forest floor and soil at acid (4.6 ± 0.4) and mesotrophic sites (5.2 ± 0.4) occur in the Douglas fir stand. It also corresponds to C/N ratio (23–26). The highest reserve of carbon in forest floor occurs at the acid site 34.7 t/ha (1.3 t/ha nitrogen). The lowest reserve of carbon in forest floor at the mesotrophic site amounts to 8.5 t/ha (0.4 t/ha nitrogen). The higher content of DOC in stands at acid sites can result in a higher risk of soil acidification. Keywords: spe

scholarly journals Combustion and Spectral Methods for Quantifying Carbon and Nitrogen Concentrations in Pacific Northwest Douglas-Fir Forest Soils

2016 ◽  
Vol 8 (6) ◽  
pp. 8
Author(s):  
Christina Tonitto ◽  
Ali Volkan Bilgili
Keyword(s):  
Spectral Analysis ◽  
Soil Carbon ◽  
Pacific Northwest ◽  
Forest Soils ◽  
Spectral Methods ◽  
Douglas Fir ◽  
Partial Least Square ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen ◽  
Nitrogen Concentrations

<p>Traditional combustion methods for assessing soil carbon (C) and nitrogen (N) stocks are time consuming and expensive; visible and near-infrared (VNIR) methods offer a quick and inexpensive alternative for establishing soil C and N concentrations. We compared combustion and spectral methods for quantifying soil carbon and nitrogen concentrations. We sampled organic and mineral soil horizons in managed and old-growth Douglas-fir (<em>Pseudotsuga menziesii</em>) forests in western Oregon. We applied combustion methods to determine total soil carbon and nitrogen concentrations of these samples. We then applied VNIR methods to derive a reference spectral library for analyzing Pacific Northwest (PNW) andesitic forest soils. Our spectral analysis confirmed that visible range spectra (especially in the 650-750 nm range) are the most useful for distinguishing differences in sample soil organic matter content. Our results provide a robust calibration model for applying spectral analysis combined with Partial Least Square Regression (PLSR) to quantify carbon and nitrogen stocks in PNW Douglas-fir forest soils. Model validation resulted in R<sup>2</sup> values ranging from 0.92 to 0.95 for C and from 0.73 to 0.84 for N.</p>

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