Species composition and herbage production of mountain rangelands in northern British Columbia

1985 ◽  
Vol 63 (11) ◽  
pp. 2077-2080
Author(s):  
Dale R. Seip ◽  
Fred L. Bunnell
Keyword(s):  
British Columbia ◽  
Species Composition ◽  
N Fertilization ◽  
Alpine Grasslands ◽  
Growing Seasons ◽  
Subalpine Grasslands

Species composition and herbage production were determined for different range types used by ungulates in northern British Columbia. In addition, the effect of N fertilization on alpine grasslands was measured. Fire-induced subalpine grasslands produced much more herbage than other range types. Graminoid production, but not forb production, was greater in wet growing seasons. Fertilization of alpine ranges with 17–35 kg N/ha did not increase the herbage production.

scholarly journals APLICAÇÃO DE NITROGÊNIO COMPLEMENTAR VIA FOLIAR NA CULTURA DO MILHO SUBMETIDO AO DESPENDOAMENTO

2019 ◽  
Vol 18 (1) ◽  
pp. 123-132
Author(s):  
CRIZ RENÊ ZANOVELLO ◽  
FABIANO PACENTCHUK ◽  
JAQUELINE HUZAR-NOVAKOWISKI ◽  
GUILHERME ZAMBONIN ◽  
ANTHONY HASEGAWA SANDINI ◽  
...  
Keyword(s):  
Crop Yield ◽  
Block Design ◽  
Maize Yield ◽  
N Fertilization ◽  
Leaf Nitrogen ◽  
Negative Effects ◽  
Maize Crop ◽  
Yield Increase ◽  
Growing Seasons ◽  
Negative Effect

RESUMO – O milho é uma planta monoica, e a geração de novos híbridos exige a remoção do pendão das plantas.Sabe-se que a remoção do pendão possui efeito negativo na produtividade da cultura. Contudo, a aplicação de Ncomplementar, via foliar, poderia minimizar essas perdas. Assim, o objetivo deste estudo foi avaliar como o Ncomplementar afeta a produtividade e os componentes de rendimento da cultura do milho submetida ao despendoamento.O estudo foi conduzido em delineamento de blocos casualizados em esquema fatorial 2 x 3 x 5, sendo duas safras(2014/15 e 2015/16), três momentos de despendoamento (sem despondoamento, arranquio de 2-3 folhas e arranquiode 4-5 folhas antes do pendoamento) e cinco doses de N complementar (0, 5, 10, 15, 20 L ha-1) aplicadas no estádio depré-pendoamento (VT). Não foi verificada interação N complementar X despendoamento para nenhuma das variáveisestudadas. A menor produtividade foi verificada no despendoamento de 4-5 folhas. A aplicação de N complementaraumentou a produtividade da cultura do milho, e a aplicação de 11,5 L ha-1 incrementou a produtividade em 448 kgha-1. O despendoamento diminuiu a produtividade da cultura do milho, quanto mais precoce o despendoamento, maisnegativo é o efeito na produtividade.Palavras-chave: Melhoramento genético, N complementar, pendoamento, produção de sementes, Zea mays.FOLIAR APPLICATION OF COMPLEMENTARY NITROGEN,IN MAIZE SUBJECTED TO DETASSELINGABSTRACT – Maize is a monoic plant and the generation of new hybrids requires the removal of the tassel from theplants, which has a negative effect on crop yield. However, the use of complementary leaf nitrogen (N) fertilization,could minimize the yield losses. Therefore, the objective of this study was to evaluate the effect os the application ofcomplementary N affects on yield of the maize crop subjected to detasseling. The study was carried out in a randomizedcomplete block design, with a 2 x 3 x 5 factorial scheme and four replications. Two growing seasons (2014/15 and2015/16), three detasseling moments (without detasseling, detasseling of 2-3 leaves, and detasseling of 4-5 leaves)and five doses of complementary N (0, 5, 10, 15, 20 L ha-1) applied at the VT stage. There was no interaction betweencomplementary N and detasseling for any of the variables studied. The lowest yield was verified with the detasselingof 4-5 leaves. The application of complementary N showed a positive effect on maize yield, and the application of 11.5L ha-1 of complementary N provided yield increase of 448 kg ha-1. The detasseling technique had negative effects onmaize crop yield, the earlier is the detasseling, the more negative is the effect on yield.Keywords: Genetic improvement, Seed production, tasseling, Zea mays.

scholarly journals The Effects of Juvenile Spacing on 7-Year-Old Lodgepole Pine in Central British Columbia

2005 ◽  
Vol 20 (3) ◽  
pp. 160-166 ◽  
Author(s):  
Wayne D. Johnstone
Keyword(s):  
British Columbia ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Growth And Yield ◽  
Individual Tree ◽  
Growing Stock ◽  
Growing Seasons ◽  
Individual Tree Growth ◽  
Second Growth ◽  
The Individual

Abstract The effects of spacing 7-year-old second-growth lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) are reported 20 growing seasons after treatment. Five spacing levels of 500, 1,000, 1,500, 2,000, and 2,500 trees per hectare, plus unspaced controls, were established on plots in central British Columbia. Both individual-tree and per-hectare data were analyzed. Spacing had a significant effect on all of the individual-tree characteristics examined, but its effect on per-hectare values was mixed. Although this report only provides short-term information on the effects of juvenile spacing on the growth and yield of lodgepole pine, it does indicate the need to optimize individual-tree growth rates with levels of growing stock to maximize yield per unit area. West. J. Appl. For. 20(3):160–166.

scholarly journals Contrasting microbial biogeographical patterns between anthropogenic subalpine grasslands and natural alpine grasslands

2015 ◽  
Vol 209 (3) ◽  
pp. 1196-1207 ◽  
Author(s):  
Roberto A. Geremia ◽  
Mihai Pușcaș ◽  
Lucie Zinger ◽  
Jean‐Marc Bonneville ◽  
Philippe Choler
Keyword(s):  
Alpine Grasslands ◽  
Subalpine Grasslands

Thrips (Thysanoptera) associated with two morphological forms of Andean lupin (Lupinus mutabilis)

Biologia ◽  
2015 ◽  
Vol 70 (7) ◽  
Author(s):  
Michał Hurej ◽  
Halina Kucharczyk ◽  
Jacek P. Twardowski ◽  
Andrzej Kotecki
Keyword(s):  
Species Composition ◽  
White Paper ◽  
Thrips Tabaci ◽  
Research Station ◽  
Sowing Time ◽  
Morphological Form ◽  
Growing Seasons ◽  
Lupinus Mutabilis ◽  
Thrips Species

AbstractThe aim of this study was to determine thrips abundance, species composition, sex ratio and seasonal dynamics of these insects on two morphological forms of Andean lupin (epigonal and semiepigonal). Thrips were studied in the lupine plants sown at two dates at the Experimental Research Station at Pawłowice, near Wrocław, Lower Silesia, Poland, during two growing seasons (2011-2012). The experiment was designed as a split-plot with four replicates for each morphological form and time of sowing. For the determination of thrips species’ composition, plants were collected from the central part of each plot when lupin was at the full blooming stage. In the laboratory, plants were shaken over a sheet of white paper. Once in each season thrips were also collected with a sweep net. In the laboratory larvae and adults were identified to species level and separated into males and females. During the whole lupin growing season, insects were also counted weekly on 10 consecutive plants in the middle row of each plot. Frankliniella intonsa, Thrips major and Aeolothrips intermedius were the dominant species in the full blooming stage of both semiepigonal and epigonal forms of Andean lupin. Thrips tabaci also occurred in greater numbers. There were no significant differences between numbers of thrips and number of species occurring on semiepigonal and epigonal plants sown at the same time. In the most numerous species, like F. intonsa and T. major, mainly females occurred in their population. In the population of A. intermedius males were abundant. Thrips occurring in Lupinus mutabilis, irrespective of the used form of lupin or sowing time, had one peak of abundance, i.e., the last ten days of June and the first ten days of July, when plants were at the blooming stage.

Advance regeneration and trajectories of stand development following the mountain pine beetle outbreak in boreal forests of British Columbia

2015 ◽  
Vol 45 (10) ◽  
pp. 1327-1337 ◽  
Author(s):  
Elizabeth M. Campbell ◽  
Joseph A. Antos
Keyword(s):  
British Columbia ◽  
Species Composition ◽  
Boreal Forests ◽  
Mountain Pine Beetle ◽  
Size Structure ◽  
Fire Disturbance ◽  
Active Management ◽  
Advance Regeneration ◽  
Mountain Pine ◽  
Pine Beetle

A mountain pine beetle (Dendroctonus ponderosae Hopkins) outbreak has recently spread into boreal forests, with unknown consequences for this ecosystem. We intensively sampled 12 stands affected by the current outbreak in northern British Columbia to determine the potential of western boreal forests to recover from this novel disturbance. We sampled the species composition, size structure, and spatial distribution (using 5 m × 5 m subplots, 40 per stand) of live and dead trees and used a variety of analyses, including ordinations, to assess potential developmental trajectories of stands. Advance regeneration (stems < 10 m tall) varied greatly in abundance among stands (50–18 280 stems·ha−1). However, most subplots contained at least one individual; only three stands had many empty subplots. We conclude that most stands have enough advance regeneration and residual canopy trees to form a nearly continuous new canopy. Ordinations indicate that species composition will shift substantially and become more divergent among stands. Species of high economic value will remain common, though, and active management will not be necessary in most stands to maintain productive forests. However, this novel disturbance will have very different effects on these forests than the typical fire-disturbance regime and is likely to deflect these forests into new successional trajectories.

scholarly journals Management of nitrogen fertilization in maize cultivated in succession to black oats in a temperate climate

2018 ◽  
Vol 9 (2) ◽  
pp. 202-210
Author(s):  
Ricardo Henrique Ribeiro ◽  
Marcos Renan Besen ◽  
Samuel Luiz Fioreze ◽  
Jonatas Thiago Piva
Keyword(s):  
Management Strategies ◽  
N Fertilization ◽  
Temperate Climate ◽  
Early Developmental Stage ◽  
Early Application ◽  
N Application ◽  
Drought Period ◽  
Growing Seasons ◽  
Productive Potential ◽  
N Management

The objective of this study was to verify early nitrogen (N) fertilization on maize cultivated in succession to black oats. We conducted three experiments, relating to the 2012/13, 2013/14, and 2014/15 growing seasons, at UFSC-Curitibanos, in a randomized complete block experimental design, with four treatments and four replicates. The treatments were N management strategies in which the amount of N applied to maize was split into pre-sowing, at sowing, and topdressing times: (T1) control with no N application; (T2) 2/3 - 1/3 - 0; (T3) 1/3 - 1/3 - 1/3; and (T4) 0 - 1/3 - 2/3. The biometrics and productive potential parameters of the crop were evaluated. Application of N, regardless of the treatment, increased the yield. In 2012/13, there were no significant differences between the ways in which the N application was split, although they produced a higher yield than the control, resulting in a mean yield of 5,008 kg ha-1. In 2013/14, T2 was similar to T3 and T4, resulting in a yield of 9,858 kg ha-1; in 2014/15, T3 and T4 were similar, with a mean yield of 12,466 kg ha-1, while T2 resulted in a lower yield of 10,487 kg ha-1. When 2/3 of the N is applied pre-sowing, it is only effective when it is associated with the occurrence of a drought period at an early developmental stage of the plants. In adequate rainfall conditions, the early application of N fertilization is only effective when combined with a further 1/3 of the amount of N at sowing, and later as a topdressing.

Species composition and genetic diversity of farmed mussels in British Columbia, Canada

Aquaculture ◽  
2017 ◽  
Vol 466 ◽  
pp. 33-40 ◽  
Author(s):  
Helen J. Gurney-Smith ◽  
A. Joy Wade ◽  
Cathryn L. Abbott
Keyword(s):  
Genetic Diversity ◽  
British Columbia ◽  
Species Composition

scholarly journals Incidence of armoured scale insects on persimmons

2000 ◽  
Vol 53 ◽  
pp. 211-215
Author(s):  
A.R Tomkins ◽  
D.J. Wilson ◽  
C. Thomson ◽  
P. Allison
Keyword(s):  
Species Composition ◽  
Common Species ◽  
Scale Insects ◽  
Diospyros Kaki ◽  
Persimmon Fruit ◽  
Growing Seasons ◽  
Aspidiotus Nerii ◽  
Armoured Scale Insects

The incidence of armoured scale insects infesting persimmons (Diospyros kaki) grown in five districts (Whangarei (Northland) Pukekohe (South Auckland) Morrinsville (Waikato) Maketu (Bay of Plenty) and Gisborne (Poverty Bay)) was investigated over three growing seasons (1995/96 1996/97 and 1997/98) Three species of armoured scale insects were found on persimmon fruit greedy scale (Hemiberlesia rapax) latania scale (H lataniae) and oleander scale (Aspidiotus nerii) The species composition differed between districts with latania scale the most common species recorded overall Fruit were infested by the first and second generations of all three species Latania scale infested a higher proportion of leaves than fruit

Effects of clear-cut logging on the diversity and persistence of ectomycorrhizae at a subalpine forest

1999 ◽  
Vol 29 (1) ◽  
pp. 124-134 ◽  
Author(s):  
Shannon M Hagerman ◽  
Melanie D Jones ◽  
Gary E Bradfield ◽  
M Gillespie ◽  
D M Durall
Keyword(s):  
British Columbia ◽  
Fine Roots ◽  
Growing Season ◽  
Diversity Indices ◽  
Forest Edge ◽  
Subalpine Forest ◽  
Inoculum Source ◽  
Clear Cut ◽  
Growing Seasons ◽  
Tree Removal

The mycelium extending from ectomycorrhizal fine roots is thought to be an important inoculum source for outplanted seedlings. The purpose of this study, carried out at a subalpine forest in British Columbia, was to investigate the effect of three different clear-cut sizes: 0.1, 1.0, and 10 ha, on the persistence and diversity of ectomycorrhizae. Over the course of the study, a total of 39 distinct mycorrhizal types were observed. The dominant types matched descriptions of E-strain mycorrhizae and of mycorrhizae formed by Cenococcum spp., two types of Lactarius spp., Piloderma spp., Hebeloma spp., Amphinema spp., and Cortinarius spp. One growing season after tree removal, there were no differences between the treatments in the numbers of active fine roots at any location nor were there any effects on the diversity of ectomycorrhizae with treatment. Two and three growing seasons after logging the persistence of some of the main morphotypes differed with treatment. Although there were no differences in the diversity indices at corresponding distances within the different opening sizes, after two and three growing seasons the numbers of active fine roots as well as the diversity of ectomycorrhizae in clearcuts was significantly reduced with distance from the forest edge.

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