Dynamics of a broadleaved (Castanea sativa) conifer (Pseudotsuga menziesii) mixed stands in Northern Portugal

This study aimed to estimate leaf litter decomposition rates in eastern beech (Fagus orientalis Lipsky) and sweet chestnut (Castanea sativa Mill.) mixed stands in Düzce-Akçakoca, located in the Western Black Sea Region of Turkey. The sampling areas represent four different elevations and two aspects at each elevation. Amounts of annual beech and chestnut litter fall were estimated as 5.19 Mg ha-1 and 4.61 Mg ha-1, respectively. Litter decomposition was examined over five time periods (0.25, 0.50, 1.25, 2.25, and 4.25 years) by using the litter bag method. The amount of remaining beech leaf litter mass was found to be 1.1, 1.2, 1.2, 1.4, and 1.3 times greater than the amount of chestnut leaf litter, respectively. However, estimated values for the decomposition rate-constant (k) of chestnut for all time periods were found to be approximately 1.5 times greater than those of beech leaf litter. Litter in beech stands decomposed more rapidly at higher elevations during the first year, but at lower elevations in the second year, likely due to increased temperature and precipitation for the corresponding years. Leaf litter in chestnut stands decomposed more rapidly at lower elevations in the second and fourth year, reflecting higher precipitation of those years.

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Production potential of Douglas fir at mesotrophic sites of Křtiny Training Forest Enterprise

Journal of Forest Science ◽

10.17221/35/2008-jfs ◽

2008 ◽

Vol 54 (No. 7) ◽

pp. 321-332 ◽

Cited By ~ 8

Author(s):

P. Kantor

Keyword(s):

Pseudotsuga Menziesii ◽

Douglas Fir ◽

Production Potential ◽

European Larch ◽

Mixed Stands ◽

Production Parameters ◽

Breast Height ◽

The Mean ◽

The One ◽

Mature Stands

: The study evaluates production parameters (height, diameter at breast height, volume) of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) at mesotrophic sites of the Křtiny Training Forest Enterprise in mature stands. In total, 29 mixed stands were assessed with the registered proportion of Douglas fir at an age of 85 to 136 years. Comparing the 10 largest Douglas firs with the 10 largest spruces or larches higher, and as a rule markedly higher, production potential of introduced Douglas fir was found in all assessed stands. There were also groups of trees where the volume of Douglas fir was twice to 3 times higher than the volume of spruce or larch (see Tabs. 5 to 10). For example, in stand 177B11, the mean volume of 9.12 m3 was recorded in the 10 largest Douglas fir trees but the volume of spruce reached only 3.17 m3 and the volume of larch was 3.70 m3. Differences in mensurational parameters of Douglas fir found on the one hand and of Norway spruce (Picea abies [L.] Karst.) or European larch (Larix decidua Mill.) on the other hand compared by ANOVA tests were statistically highly significant. Annual ring analyses have shown that at present the volume increment of particular Douglas fir trees ranges from 0.12 to 0.16 m3 per year in mature stands (i.e. about 1.5 m3 every 10 years).

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The Dynamics of Mixed Stands of Alnus Rubra and Pseudotsuga Menziesii: Extension of Size--Density Analysis to Species Mixture

Journal of Ecology ◽

10.2307/2260690 ◽

1992 ◽

Vol 80 (3) ◽

pp. 449 ◽

Cited By ~ 39

Author(s):

K. J. Puettmann ◽

D. E. Hibbs ◽

D. W. Hann

Keyword(s):

Pseudotsuga Menziesii ◽

Alnus Rubra ◽

Mixed Stands ◽

Species Mixture ◽

Density Analysis

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HOST ASSOCIATIONS IN SYMPATRIC POPULATIONS OF CHORISTONEURA OCCIDENTALIS FREEMAN AND C. RETINIANA (WALSINGHAM) (LEPIDOPTERA: TORTRICIDAE) IN SOUTH-CENTRAL OREGON AT HIGH POPULATION DENSITIES

The Canadian Entomologist ◽

10.4039/ent123713-3 ◽

1991 ◽

Vol 123 (3) ◽

pp. 713-715 ◽

Cited By ~ 1

Author(s):

Willis C. Schaupp

Keyword(s):

Pseudotsuga Menziesii ◽

Douglas Fir ◽

Choristoneura Occidentalis ◽

Western North America ◽

Western Spruce Budworm ◽

Population Densities ◽

Sympatric Populations ◽

Mixed Stands ◽

South Central ◽

White Fir

Sympatric, synchronous populations of conifer-feeding Choristoneura (Lepidoptera: Tortricidae) occur in western North America (Powell 1980). Choristoneura occidentalis Freeman, the western spruce budworm, co-exists with C. retiniana, the Modoc budworm, in mixed stands of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and true firs, Abies spp. Choristoneura occidentalis has brown larvae and a broad geographic distribution associated with one of its principle hosts, Douglas-fir (Stehr 1967). Larvae of C. retiniana are green and feed on true firs, particularly white fir, Abies concolor (Gord. & Glend.) Lindl. (Stehr 1967; Carolin et al. 1987).

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Root density and root biomass in pure and mixed forest stands of Douglas-fir and beech

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v43i3.570 ◽

1995 ◽

Vol 43 (3) ◽

pp. 321-331 ◽

Cited By ~ 3

Author(s):

C.M.A. Hendriks ◽

F.J.J.A. Bianchi

Keyword(s):

Pseudotsuga Menziesii ◽

Root Length ◽

Fine Roots ◽

Root Biomass ◽

Mixed Forest ◽

Douglas Fir ◽

Root Density ◽

Mixed Stands ◽

Rooting Pattern ◽

Below Ground

Below-ground interactions possibly play an important role in the success of mixed forests. Therefore, root density, root length, root biomass and rooting pattern were surveyed in representative pure and mixed stands of Douglas fir (Pseudotsuga menziesii) and beech (Fagus sylvatica) in the Veluwe area of central Netherlands. Each type of stand was represented by stands approximately 40 and 70 years old. The study was restricted to fine roots (

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Stem growth is favored at expenses of root growth in mixed stands and humid conditions for Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica)

Trees ◽

10.1007/s00468-016-1512-4 ◽

2016 ◽

Vol 31 (1) ◽

pp. 349-365 ◽

Cited By ~ 12

Author(s):

Eric Andreas Thurm ◽

Peter Biber ◽

Hans Pretzsch

Keyword(s):

Root Growth ◽

Pseudotsuga Menziesii ◽

Fagus Sylvatica ◽

European Beech ◽

Douglas Fir ◽

Stem Growth ◽

Mixed Stands

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Rhizina undulata. [Descriptions of Fungi and Bacteria].

IMI Descriptions of Fungi and Bacteria ◽

10.1079/dfb/20056400324 ◽

1972 ◽

Author(s):

C. Booth

Keyword(s):

New York ◽

Geographical Distribution ◽

Pseudotsuga Menziesii ◽

Pinus Contorta ◽

Abies Alba ◽

Castanea Sativa ◽

Washington State ◽

Disease Group ◽

Wet Weather ◽

Mycelial Strands

Abstract A description is provided for Rhizina undulata. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Larix decidua, L. leptolepis, Picea abies, P. sitchensis, Pinus contorta, P. nigra, P. maritima, P. sylvestris, P. elliottii var. elliottii, P. patula, P. pinaster, P. strobus, Pseudotsuga menziesii, Tsuga mertensiana, T. heterophylla, Abies alba among softwoods, and Castanea sativa, a hardwood. DISEASE: Group dying of conifers. The disease is characterized by the death of seedlings or plantation trees in groups, which are always found around old fire sites. The roots of infected trees are covered with white or yellowish mycelial strands and fruit bodies of the fungus are formed on the litter at the base of diseased trees during wet weather. GEOGRAPHICAL DISTRIBUTION: Europe (Belgium, Britain, Bulgaria, Finland, France, Germany, Netherlands, Poland, Republic of Ireland, Sweden, USSR (Lithuania & Latvia SSR)); Africa (Rhodesia, Ngwane (formerly Swaziland), South Africa); USA (Oregon, Washington State, Minnisota, California, Md, New York); Canada (British Columbia). TRANSMISSION: By ascospores through the soil, after they have been activated by exposure to temperatures of 35-45°C in the neighbourhood of pine roots.

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