Impact of soil stockpiling on ericoid mycorrhizal colonization and growth of velvetleaf blueberry ( Vaccinium myrtilloides ) and Labrador tea ( Ledum groenlandicum )

2020 ◽  
Author(s):  
Sepideh Fadaei ◽  
Shanjida Khan ◽  
Michelle Young ◽  
Ira Sherr ◽  
Janusz J. Zwiazek
Keyword(s):  
Mycorrhizal Colonization ◽  
Labrador Tea ◽  
Vaccinium Myrtilloides ◽  
Ledum Groenlandicum

Flower cold hardiness: a potential determinant of the flowering sequence exhibited by bog ericads

1979 ◽  
Vol 57 (9) ◽  
pp. 997-999 ◽  
Author(s):  
R. J. Reader
Keyword(s):  
Low Temperatures ◽  
Cold Hardiness ◽  
Vaccinium Macrocarpon ◽  
Southern Ontario ◽  
Air Temperatures ◽  
Insect Pollinators ◽  
Cold Hardy ◽  
Vaccinium Myrtilloides ◽  
Potential Determinant ◽  
Ledum Groenlandicum

In laboratory freezing trials, cold hardiness of six types of bog ericad flowers differed significantly (i.e., Chamaedaphne calyculata > Andromeda glaucophylla > Kalmia polifolia > Vaccinium myrtilloides > Ledum groenlandicum > Vaccinium macrocarpon) at air temperatures between −4 and −10 °C but not at temperatures above −2 °C. At the Luther Marsh bog in southern Ontario, low temperatures (−3 to −7 °C) would select against May flowering by the least cold hardy ericads. Availability of pollinators, on the other hand, would encourage May flowering by the most cold hardy species. Presumably, competition for insect pollinators has promoted the diversification of bog ericad flowering peaks, while air temperature, in conjunction with flower cold hardiness, determined the order in which flowering peaks were reached.

Lodgepole pine/Labrador tea type communities of western Canada

2002 ◽  
Vol 80 (2) ◽  
pp. 151-165 ◽  
Author(s):  
W L Strong
Keyword(s):  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Inverse Correlation ◽  
Yukon Territory ◽  
Western Canada ◽  
Different Types ◽  
Successional Species ◽  
Labrador Tea ◽  
The Common ◽  
Ledum Groenlandicum

Lodgepole pine/Labrador tea (Pinus contorta Dougl. ex Loud. var. latifolia/Ledum groenlandicum Oeder) relevés were classified and characterized based on data from archival sources (n = 428). Eleven forest communities were recognized and were distinguished by the relative dominance of Sphagnum, Cladina and Cladonia, Lycopodium, Vaccinium species, or feathermosses. Picea mariana (Mill.) BSP was the common secondary successional species. Most paired-community comparisons were nonoverlapping in ordination space, although intermingling sometimes occurred along interfaces. Lodgepole pine/Labrador tea stands occurred on upland sites within the boreal–cordilleran ecoclimatic transition zone along the eastern slopes of the Rocky Mountains from southwestern Alberta to the southern Yukon Territory. Nine communities had mesic to subhygric moisture and submesotrophic to mesotrophic nutrient regimes. The exceptions were a Pinus contorta/Ledum groenlandicum/Sphagnum (wetter sites) and a Pinus contorta/Ledum groenlandicum/Cladina mitis (drier sites) community. An inverse correlation occurred between latitudinal location and elevation of occurrence (r = –0.56, P < 0.001, n = 403) with a northward decline of 65 m/100 km. The concept of a "type community" is proposed for formally documenting the composition of plant communities and optimizing the comparability of different types. Eight of the recognized communities fulfilled the proposed criteria for a type community and two were considered provisional types.Key words: vegetation classification, Pinus contorta, Ledum groenlandicum, type community.

Contribution of overwintering leaves to the growth of three broad-leaved, evergreen shrubs belonging to the Ericaceae family

1978 ◽  
Vol 56 (10) ◽  
pp. 1248-1261 ◽  
Author(s):  
R. J. Reader
Keyword(s):  
Growing Season ◽  
Leaf Nitrogen ◽  
Leaf Nitrogen Content ◽  
Nitrogen And Phosphorus ◽  
Southern Ontario ◽  
Plant Parts ◽  
Mature Leaves ◽  
Growing Seasons ◽  
Labrador Tea ◽  
Ledum Groenlandicum

Individual leaves of three bog ericads, leatherleaf (Chamaedaphne calyculata), bog laurel (Kalmia polifolia), and Labrador tea (Ledum groenlandicum), were retained for a maximum of two growing seasons in a peat bog in southern Ontario. The premature loss of mature leaves, resulting from artificial defoliation, significantly reduced the growth of new shoots of L. groenlandicum and K. polifolia but not of C. calyculata. Defoliation effects were directly proportional to the normal retention time for overwintering leaves. Mature leaves probably translocate photosynthate, nitrogen, and phosphorus to other plant parts. This would explain why leaf dry weights were greatest at the start, rather than at the end, of the leaves' second growing season. Net photosynthetic rates decreased with leafage, but in terms of leaf nitrogen content, new and old leaves fixed equal amounts of carbon.

Effects of nitrogen fertilizer, shade, and the removal of new growth on longevity of overwintering bog ericad leaves

1980 ◽  
Vol 58 (16) ◽  
pp. 1737-1743 ◽  
Author(s):  
R. J. Reader
Keyword(s):  
Nutrient Availability ◽  
Nitrogen Fertilizer ◽  
Treatment Effects ◽  
Environmental Gradients ◽  
Growing Season ◽  
Interspecific Variation ◽  
Southern Ontario ◽  
Growing Seasons ◽  
Labrador Tea ◽  
Ledum Groenlandicum

Bog ericads, such as Labrador tea (Ledum groenlandicum), bog laurel (Kalmia polifolia), and leatherleaf (Chamaedaphne calyculata), retain individual leaves for two growing seasons in southern Ontario, presumably to facilitate nutrient movement between overlapping leaf cohorts. The objective of this study was to evaluate the effects of nutrient availability, shade, and the removal of new growth on the longevity of leaves during their second growing season. Longevity was extended significantly (p < 0.05) by removing new growth, but not by shading leaves (p > 0.05). The addition of nitrogen fertilizer increased only C. calyculata longevity. Interspecific variation in treatment effects appeared to be related to the positions occupied by the three species on environmental gradients. None of the experimentally treated leaves survived past the end of their second growing season, with the magnitude of treatment effects ranging from a reduction in longevity of 10 days to an increase of 25 days.

Forest microfungi. I. Ampulliferina persimplex n. gen., n. sp. on leaves of labrador tea

1969 ◽  
Vol 47 (4) ◽  
pp. 609-616 ◽  
Author(s):  
B. C. Sutton
Keyword(s):  
Labrador Tea ◽  
Ledum Groenlandicum

Ampulliferina persimplex n. gen., n. sp. is described and illustrated from material on moribund leaves of Ledum groenlandicum Oeder collected in Manitoba and Saskatchewan. The fungus is characterized by hyphopodiate superficial mycelia, simple separate unicellular conidiophores each forming an un-branched acropetal chain of cylindrical, brown, 1-septate, truncate conidia. The genus is compared and contrasted with Xylohypha (Fr.) Mason, Septonema Corda, Bispora Corda, Ampullifera Deighton, Clasterosporium Schw., Septotrullula Höhn., Ampulliferella Bat. & Caval., and Ampulliferopsis Bat. & Caval.

The vegetation and chemical properties of patterned fens in the Swan Hills, north central Alberta

1975 ◽  
Vol 53 (23) ◽  
pp. 2776-2795 ◽  
Author(s):  
D. H. Vitt ◽  
P. Achuff ◽  
R. E. Andrus
Keyword(s):  
Picea Mariana ◽  
Vascular Plants ◽  
Chemical Properties ◽  
Vegetation Patterns ◽  
North Central ◽  
Water Flows ◽  
Sphagnum Magellanicum ◽  
Ledum Groenlandicum ◽  
Menyanthes Trifoliata ◽  
And Chemical Properties

Three patterned fens in north central Alberta were analyzed to elucidate vegetation patterns in vascular plants and bryophytes. Two flark associations dominated by Menyanthes trifoliata and Carex limosa, both of which had Sphagnum jensenii and Drepanocladus exannulatus phases, were recognized. The strings consist of two associations; one is dominated by Betula glandulosa, Tomenthypnum falcifolium, and Aulacomnium palustre; the second is dominated by Picea mariana, Sphagnum magellanicum, and Ledum groenlandicum. An intensive analysis of one fen reveals that these mires are ‘poor fens’ with a mean pH of 5.2 and Ca2+concentration of 2.3 ppm. The fens occur on low drainage divides and Ca2+ is depleted as water flows through the fens. An ecological series of bryophytes is described in the transitions between flarks and strings.

Mycorrhizal colonization of major banana genotypes in six East African environments

2012 ◽  
Vol 157 ◽  
pp. 40-46 ◽  
Author(s):  
Svetlana Gaidashova ◽  
Antoine Nsabimana ◽  
Deborah Karamura ◽  
Piet van Asten ◽  
Stephane Declerck
Keyword(s):  
Mycorrhizal Colonization ◽  
East African

Prescribed burning for lowland black spruce regeneration in northern Minnesota

1984 ◽  
Vol 14 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Scott E. Aksamit ◽  
Frank D. Irving
Keyword(s):  
Prescribed Burning ◽  
Black Spruce ◽  
Controlled Study ◽  
University Of Minnesota ◽  
Feather Moss ◽  
Wide Range ◽  
Labrador Tea ◽  
Tall Shrub ◽  
The University ◽  
Larger Sample

Concern over the variability of black spruce (Piceamariana (Mill.) B.S.P.) regeneration on peatlands in northern Minnesota following prescribed burning led to a cooperative study between the University of Minnesota and the Minnesota Department of Natural Resources. Twenty-seven black spruce cutovers on State lands that had been prescribed burned and either seeded or left to regenerate naturally were sampled. These were stratified into sphagnum – Labrador-tea – leather-leaf (SPHG) sites (10), feather moss (FM) sites (9), and alder – graminoid – other tall shrub (ALDR) sites (8). Results indicate that fire was not necessary to regenerate SPHG sites. FM sites required fire to modify unfavorable seedbeds and to reduce competition. Best results were obtained by burning when the upper layers of the peat were highly desiccated. ALDR sites occupied a wide range of ecological conditions which led to highly variable regeneration results. A larger sample size and possibly more carefully controlled study conditions are needed to fully understand ALDR site regeneration. Seeding results were uncertain for all sites.

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