Evaluation of ERTS Imagery for Vegetation Interpretation in British Columbia

1974 ◽  
Vol 28 (2) ◽  
pp. 147-154 ◽  
Author(s):  
E.T. Oswald
Keyword(s):  
British Columbia ◽  
Image Analysis ◽  
Natural Resources ◽  
Tree Species ◽  
Small Scale ◽  
Forest Types ◽  
Forest Land ◽  
Forest Stands ◽  
Vegetation Communities ◽  
Forested Areas

ERTS imagery has provided a means of surveying the natural resources on the earth’s surface by multiband, small-scale sequential imagery. This is a new tool for taking an inventory of natural resources. It requires evaluation for different purposes. The imagery was evaluated for distinguishing vegetation communities. Nonforested land could be easily separated from forest land and some distinctions could be made within these broad categories. Cut-over forest land, some meadows, grassland and highly developed urban land (towns) could be separated within the nonforested land. Differently aged forest stands, either from fire or reforestation, could be distinguished within the forested areas. Tree species could not be separated except through knowledge of successional patterns in some areas. Major forest types were generally not separable. The results and conclusions are tentative because equipment for image analysis was not available and only two sets of imagery of study areas were available: one in mid-May and one in mid-August.

scholarly journals Effect of Disturbance Regimes on Spatial Patterns of Tree Species in Three Sites in a Tropical Evergreen Forest in Vietnam

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Do Thi Ngoc Le ◽  
Nguyen Van Thinh ◽  
Nguyen The Dung ◽  
Ralph Mitlöhner
Keyword(s):  
Spatial Patterns ◽  
Tree Species ◽  
Interspecific Interactions ◽  
Abundant Species ◽  
Evergreen Forest ◽  
Small Scale ◽  
Forest Types ◽  
Disturbance Regimes ◽  
Tropical Evergreen Forest ◽  
Disturbed Forest

The effects of disturbance regimes on the spatial patterns of the five most abundant species were investigated in three sites in a tropical forest at Xuan Nha Nature Reserve, Vietnam. Three permanent one-ha plots were established in undisturbed forest (UDF), lightly disturbed forest (LDF), and highly disturbed forest (HDF). All trees ≥5 cm DBH were measured in twenty-five 20 m × 20 m subplots. A total of 57 tree species belonging to 26 families were identified in the three forest types. The UDF had the highest basal area (30 m2 ha−1), followed by the LDF (17 m2 ha−1) and the HDF (13.0 m2 ha−1). The UDF also had the highest tree density (751 individuals ha−1) while the HDF held the lowest (478 individuals ha−1). Across all species, there were 417 “juveniles,” 267 “subadults,” and 67 “adults” in the UDF, while 274 “juveniles,” 230 “subadults,” and 36 “adults” were recorded in the LDF. 238 “juveniles,” 227 “subadults,” and 13 “adults” were obtained in the HDF. The univariate and bivariate data with pair- and mark-correlation functions of intra- and interspecific interactions of the five most abundant species changed in the three forest types. Most species indicated clumping or regular distributions at small scale, but a high ratio of negative interspecific small-scale associations was recorded in both the LDF and HDF sites. These were, however, rare in the UDF.

Small-Scale Imagery in Forest Pest Surveys in British Columbia

1974 ◽  
Vol 28 (2) ◽  
pp. 155-161 ◽  
Author(s):  
John W. E. Harris
Keyword(s):  
British Columbia ◽  
Aerial Photographs ◽  
Small Scale ◽  
Forest Pest ◽  
Forest Insect ◽  
Disease Survey ◽  
Forested Areas ◽  
Increasing Demand ◽  
Accurate Record ◽  
Improved Methods

Surveillance of the large forested areas of British Columbia by personnel of the Forest Insect and Disease Survey, Canadian Forestry Service, involves ground examinations, supplemented by limited observations from small aircraft. The increasing demand for better information, however, has resulted in a search for improved methods. One answer seems to be aerial photography, which offers a permanent accurate record. Conventional aerial photographs are useful but are expensive to obtain and interpret. This study has determined that the boundaries and intensity of a variety of forest pest infestations can also be delineated on color photographs at some of the smallest scales (about 1:137,000) available, and at least some infestations that contrast well with surrounding forests can also be seen on ERTS-1 imagery. The latter has the advantage of being routinely available and cost shared by various users, while normal photography requires a specific mission. Results with ERTS-1 are encouraging, and likely improvements in future resource satellites may be of increasing value in survey programs.

Slow growth, long-lived trees, and minimal disturbance characterize the dynamics of an ancient, montane forest in coastal British Columbia

2006 ◽  
Vol 36 (11) ◽  
pp. 2826-2838 ◽  
Author(s):  
Roberta Parish ◽  
Joseph A Antos
Keyword(s):  
British Columbia ◽  
Tree Species ◽  
Vegetative Reproduction ◽  
Tsuga Heterophylla ◽  
Growth Patterns ◽  
Small Scale ◽  
Seedling Bank ◽  
History Of ◽  
Coastal British Columbia ◽  
Level Disturbance

Elucidating the factors that structure very old forests is crucial to understanding their dynamics. We reconstructed the history of an ancient (1000-year-old) stand in the mountains of coastal British Columbia that contained four tree species (Abies amabilis (Dougl.) Forbes, Chamaecyparis nootkatensis (D. Don) Spach., Tsuga mertensiana (Bong.) Carr., and Tsuga heterophylla (Raf.) Sarg.) in the canopy and the seedling bank. Using dendrochronological procedures, we examined the growth patterns of all trees (>4.0 cm diameter at breast height) in four 0.25 ha mapped plots. We also sampled the seedling bank in the four plots. Age structures indicated variable but rather continuous recruitment for all species. Periods of increased amounts of release or rapid early growth occurred but were not pronounced. Overall, we found little evidence for stand-level disturbance or the formation of large gaps. All four tree species appear able to persist in the stand in the absence of major stand-level disturbance, but the mechanisms contributing to coexistence differ. One species, C. nootkatensis, depends primarily on vegetative reproduction for persistence. Single-tree gap dynamics have predominated in the stand for centuries, placing this stand at the far end of the gradient from forests controlled by large, severe disturbances to those where very small-scale processes predominate.

FEATURES OF THE WATER REGIME IN THE CHERNOZEM UNDER THE STANDS OF POPLAR BIRCH AND ITS REGULATION

2020 ◽  
pp. 58-63
Author(s):  
S.V. Makarychev ◽  
Keyword(s):  
Tree Species ◽  
Water Regime ◽  
Growing Season ◽  
Forest Stands ◽  
Ecological Balance

Forest stands of the arboretum contribute to the preservation of ecological balance on the territory of Barnaul. It contains a large number of tree species, one of which is poplar birch (Betulapopulifolia). The article shows that over the years of research, the water regime in the Chernozem profile under birch stands remains tense for most of the growing season, so there is a need to use irrigation with different irrigation standards, depending on the emerging hydrological state.

scholarly journals Workshop: Conserving woodland caribou in the managed forest

Rangifer ◽  
1998 ◽  
Vol 18 (5) ◽  
pp. 263
Author(s):  
George Hamilton et al.
Keyword(s):  
British Columbia ◽  
Natural Resources ◽  
Forest Products ◽  
Woodland Caribou ◽  
Managed Forest ◽  
Points Of View ◽  
Canadian Wildlife

A workshop was held August 19 to foster discussion and debate on issues related to conservation of woodland caribou in the managed forest. Six panelists were invited to make brief presentations on their points of view on this subject. They were Don Thomas (Canadian Wildlife Service); Hartley Multimaki (Buchanan Forest Products); Colin Edey (NOVA Corporation); Jerry English (Ontario Ministry of Natural Resources - retired); Dale Seip (British Columbia Ministry of Forests) and Harold Cumming (Lakehead University - retired).

scholarly journals Selection of the assortment of trees for protective forest plantations

2020 ◽  
Author(s):  
A.I. Petelko ◽  
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Effective Means ◽  
Water Erosion ◽  
Current Status ◽  
Forest Plantations ◽  
Forest Stands ◽  
Protective Forest ◽  
Selection Of ◽  
Hydrographic Network

Reclamation of land on community land funds and the hydrographic network contributes to the most effective means of protecting the soil from water erosion. However, the condition, growth, and productivity of the protective forest stands themselves depend on the species composition. Many years of studies have clearly shown that not all tree species and shrubs can successfully grow on washed soils. Extensive scientific material provides a description of the growth and current status of the studied species, a detailed taxation description of the forest plantations. Of particular value are those species that can grow on eroded lands and protect the soil from erosion.

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