Glasshouse evaluation of the growth of Alnus rubra and Alnus glutinosa on peat and acid brown earth soils when inoculated with four sources of Frankia

1989 ◽  
pp. 35-46 ◽  
Author(s):  
L. J. Sheppard ◽  
J. E. Hooker ◽  
C. T. Wheeler ◽  
R. I. Smith
Keyword(s):  
Alnus Glutinosa ◽  
Alnus Rubra

Formation of cluster roots in Alnus incana ssp. rugosa and other Alnus species

1996 ◽  
Vol 74 (11) ◽  
pp. 1684-1686 ◽  
Author(s):  
Todd M. Hurd ◽  
Christa R. Schwintzer
Keyword(s):  
Nutrient Uptake ◽  
Nutrient Solution ◽  
Alnus Glutinosa ◽  
Hydroponic Culture ◽  
Cluster Roots ◽  
Alnus Rubra ◽  
Alnus Incana ◽  
Alnus Viridis ◽  
Speckled Alder ◽  
Complete Nutrient Solution

Small numbers of cluster roots were found on older roots of Alnus incana ssp. rugosa (speckled alder) shrubs in the field at 2 of 11 sites. Cluster roots also formed infrequently in speckled alder grown hydroponically in complete nutrient solution. No cluster roots formed in solutions lacking P or Fe. Small numbers of cluster roots also formed in Alnus glutinosa grown hydroponically in the presence of P but not in its absence. In contrast, Alnus rubra produced small numbers of cluster roots in the absence of P but not in its presence. No cluster roots formed in Alnus viridis ssp. crispa. Cluster roots are probably not important for nutrient uptake in speckled alder because they form infrequently both in the field and in hydroponic culture. Keywords: Alnus incana ssp. rugosa, Alnus glutinosa, Alnus rubra, Alnus viridis ssp. crispa, cluster roots, proteoid roots.

Frankiasymbiosis as a source of nitrogen in forestry: a case study of symbiotic nitrogen-fixation in a mixed Alnus-Picea plantation in Scotland

1985 ◽  
Vol 85 (3-4) ◽  
pp. 263-282 ◽  
Author(s):  
D. C. Malcolm ◽  
J. E. Hooker ◽  
C. T. Wheeler
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Availability ◽  
Symbiotic Nitrogen Fixation ◽  
Clay Soil ◽  
Alnus Glutinosa ◽  
Preliminary Evidence ◽  
Rooting Depth ◽  
Alnus Rubra ◽  
Mixed Stands ◽  
Different Strains

SynopsisAlnus rubragrowing in the field in Scotland is nodulated effectively by local strains ofFrankia. Strains which have been isolated fromAlnus rubraat Lennox Forest show different growth medium requirements and colony morphology compared with isolates fromAlnus glutinosaand several different strains have been isolated from the same locality. Preliminary evidence suggests that some spore negative, northwest AmericanFrankiastrains may be more effective than local spore positive crushed nodule inoculum for nitrogen-fixation inAlnus rubra.On the moderately fertile clay soil of Lennox Forest, a mixed plantation of alternatePicea silchensisandAlnus rubrashowed no improvement in growth of spruce compared with pure spruce plots. However, the presence of alder increased upper soil nitrogen status by 585 kg ha ' which approximates the standard 150 kg N ha 'of fertiliser nitrogen applied in practice to nitrogen deficient stands at about 5-year intervals. Although the alder had penetrated the subsoil, there was no apparent effect on spruce rooting depth in the mixed stands in this high clay soil. In addition to nitrogen content, the total phosphorus of the upper soil horizons was improved in the mixed plots by an estimated 3–6 kg ha-1y1and it is suggested that this phosphorus may be brought from the subsoil by the deeper rooting alder and deposited on the surface in its litter.Although improved growth of spruce in mixture withAlnus rubrais only likely where pure spruce stands are stressed for nutrients, the potential benefits of symbiotic nitrogen-fixation in silvicultural practice make it desirable to investigate other species and provenances ofAlnussuited to British conditions, to achieve maximum symbiotic fixation of nitrogen by selection and inoculation with superior strains ofFrankiaand to include such plants in trials of mixtures on sites where nitrogen-availability may be critical.

The effect of inoculation with either cultured Frankia or crushed nodules on nodulation and growth of Alnus rubra and Alnus glutinosa seedlings in forest nurseries

1991 ◽  
Vol 43 (1-2) ◽  
pp. 153-166 ◽  
Author(s):  
C.T. Wheeler ◽  
M.K. Hollingsworth ◽  
J.E. Hooker ◽  
J.D. McNeill ◽  
W.L. Mason ◽  
...  
Keyword(s):  
Alnus Glutinosa ◽  
Alnus Rubra ◽  
Forest Nurseries

Monitoring natural stand change in the forest reserve of Liedekerke, Flanders (Belgium)

1999 ◽  
Vol 64 ◽  
Author(s):  
D. Van den Meersschaut ◽  
B. De Cuyper ◽  
K. Vandekerkhove ◽  
N. Lust
Keyword(s):  
Species Composition ◽  
Castanea Sativa ◽  
Basal Area ◽  
Alnus Glutinosa ◽  
Indigenous Species ◽  
Stem Number ◽  
Mature Trees ◽  
Forest Reserve ◽  
Natural Stand ◽  
Sweet Chestnut

Natural  stand changes in the forest reserve of Liedekerke were analysed during the  period    1986-1996, using a permanent grid of circular plots. The monitoring  concentrated on natural    changes in species composition, using stem number and basal area as  indicators, and changes    in spatial distribution and colonization capacities of trees and shrubs,  with special interest in the    competition between exotic and indigenous species. After only a decade of  monitoring important    natural changes in the woody layer were detected. The pioneer forest is  gradually maturing    through self-thinning processes and shifts in species composition. The  overall stem number    decreased with 33.6%, while the basal area increased with 20.9%. Birch (Betula pendula/    pubescens) and indigenous oak (Quercus robur/petraea) remained  dominant. More tolerant    exotic species, like red oak (Quercus rubra) and sweet chestnut (Castanea  sativa), are slowly    increasing their share in the species composition and expanding their  range. Pioneer species on    the other hand, like aspen (Populus tremula), willow (Salix  capreaicinerealaurita), alder buckthorn    (Frangula alnus) and  common (Alnus glutinosa)  and grey alder (A. incana),  strongly declined.    Black cherry (Prunus serotina) seems to be slowly invading the forest due to its  massive    natural regeneration. Strong competition may be expected especially from  rowan ash (Sorbus    aucuparia), which showed similar regeneration  and colonization capacities. Elder (Sambucus    nigra) dramatically extented its range, though  its share remains marginal. Beech remained absent    most probably due to the lack of mature trees in the vacinity of the  forest. Finally this    change detection allowed that general predictions could be made on the  future natural development    and composition of this forest reserve, which could serve forest management  decisions.

scholarly journals Effectiveness of the flame retardant antiseptic properties from plant waste against fungi on alnus glutinosa

2019 ◽  
Vol 525 ◽  
pp. 012102
Author(s):  
A P Glinushkin ◽  
E M Motasova ◽  
T P Aysuvakova ◽  
A V Ovsiankina ◽  
N S Zhemchuzhina ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Alnus Glutinosa ◽  
Plant Waste

ASSIMILATION OF NITROGEN IN ROOT NODULES OF ALDER (ALNUS GLUTINOSA)

1981 ◽  
Vol 89 (2) ◽  
pp. 321-326 ◽  
Author(s):  
JAN BLOM ◽  
WIM ROELOFSEN ◽  
ANTOON D. L. AKKERMANS
Keyword(s):  
Root Nodules ◽  
Alnus Glutinosa

scholarly journals Using Discrete-Point LiDAR to Classify Tree Species in the Riparian Pacific Northwest, USA

2021 ◽  
Vol 13 (14) ◽  
pp. 2647
Author(s):  
Julia Tatum ◽  
David Wallin
Keyword(s):  
Pacific Northwest ◽  
Tree Species ◽  
3D Structure ◽  
Alnus Rubra ◽  
Populus Balsamifera ◽  
Segmentation Method ◽  
Black Cottonwood ◽  
Riparian Landscape ◽  
Individual Trees ◽  
Species Mapping

Practical methods for tree species identification are important for both land management and scientific inquiry. LiDAR has been widely used for species mapping due to its ability to characterize 3D structure, but in structurally complex Pacific Northwest forests, additional research is needed. To address this need and to determine the feasibility of species modeling in such forests, we compared six approaches using five algorithms available in R’s lidR package and Trimble’s eCognition software to determine which approach most consistently identified individual trees across a heterogenous riparian landscape. We then classified segments into Douglas fir (Pseudotsuga menziesii), black cottonwood (Populus balsamifera ssp. trichocarpa), and red alder (Alnus rubra). Classification accuracies based on the best-performing segmentation method were 91%, 92%, and 84%, respectively. To our knowledge, this is the first study to investigate tree species modeling from LiDAR in a natural Pacific Northwest forest, and the first to model Pacific Northwest species at the landscape scale. Our results suggest that LiDAR alone may provide enough information on tree species to be useful to land managers in limited applications, even under structurally challenging conditions. With slight changes to the modeling approach, even higher accuracies may be possible.

Sign in / Sign up

Export Citation Format

Share Document