A regional paleolimnological assessment of the impact of clear-cutting on lakes from the central interior of British Columbia

2001 ◽  
Vol 58 (3) ◽  
pp. 492-505 ◽  
Author(s):  
Kathleen Laird ◽  
Brian Cumming
Keyword(s):  
British Columbia ◽  
Organic Matter ◽  
Species Composition ◽  
Sediment Cores ◽  
Forest Harvesting ◽  
Diatom Species ◽  
Clear Cutting ◽  
Before And After ◽  
The Impact ◽  
Reference Lakes

The impact of forest harvesting on lakes within the central interior of British Columbia was examined in a paleolimnological study of six lakes that had 28–82% of their watersheds clear-cut (impact lakes) and four lakes that had experienced no logging in their watersheds (reference lakes). Changes in diatom species composition and percent organic matter in 210Pb-dated sediment cores were compared over the last 80 years in each of the impact lakes before and after the onset of forest harvesting and, in the reference lakes, before and after 1960 (the average onset of logging in five of the six impact lakes) and before and after 1975 (the onset of logging in one impact lake). Significant changes in species composition of diatoms following forest-harvesting activities were detected in four of the impact lakes and three of the reference lakes; however, the changes in diatom species composition were small, with changes in the relative abundance of the most common species being at most 11%. Significant increases in the percent organic matter after 1960 were found in one impact lake and three reference lakes; again these changes were small, with increases of 2–5%.

A regional paleolimnological assessment of the impact of clear-cutting on lakes from the west coast of Vancouver Island, British Columbia

2001 ◽  
Vol 58 (3) ◽  
pp. 479-491 ◽  
Author(s):  
Kathleen Laird ◽  
Brian Cumming ◽  
Rick Nordin
Keyword(s):  
Organic Matter ◽  
Species Composition ◽  
West Coast ◽  
Forest Harvesting ◽  
Diatom Species ◽  
The West ◽  
Clear Cutting ◽  
Before And After ◽  
The Impact ◽  
Reference Lakes

The impact of forest harvesting on lakes within the temperate rainforest on the west coast of Vancouver Island was examined in a paleolimnological study of four lakes that had 35–92% of their watersheds progressively clear-cut over a period of 15–30 years (impact lakes) and four lakes that had experienced little or no known anthropogenic disturbance in their watersheds (reference lakes). Changes in diatom species composition and percent organic matter in the 210Pb-dated sediment cores were compared over the last 100 years in each of the impact lakes before and after the onset of forest harvesting, which began in 1950, and before and after 1950 in the four reference lakes. Only one impact lake showed significant changes in percent organic matter. Significant changes (p < 0.05) in species composition following forest harvesting were detected in all four impact lakes and in one of the four reference lakes. However, the changes in diatom species composition following clear-cutting in the impact lakes were small, with changes in the relative abundance of the most common species being maximally 20%, but more typically 3–10%.

scholarly journals Impact of treated sewage on meiobenthic nematodes: a case study from the Tunisian Refining Industries Company

2022 ◽  
Vol 82 ◽  
Author(s):  
A. Hedfi ◽  
M. Ben Ali ◽  
A. Noureldeen ◽  
H. Darwish ◽  
T. Saif ◽  
...  
Keyword(s):  
Organic Matter ◽  
Environmental Parameters ◽  
The Other ◽  
Treated Sewage ◽  
Before And After ◽  
Bizerte Bay ◽  
De Man ◽  
The Impact

Abstract The main objective of the current study was to assess the impact of the water taken from the ‘Tunisian Refining Industries Company’ on meiobenthic nematodes, before and after a series of treatments in decantation basins followed by its discharge in Bizerte bay, Tunisia. The comparison of environmental parameters of the two types of water was clearly indicative of an improvement in the quality of treated waters after a significant reduction in their loads in hydrocarbons. Overall, the water retained a good quality after being treated by ‘Tunisian Refining Industries Company’ before discharge in the sea. At the end of the experiment, differential responses were observed according to the richness of sediment in organic matter and hydrocarbons. Thus, it was apparent that the nematode assemblage exposed to the treated waters was closer to controls and associated to higher values of abundance, than that under untreated ones. It was also assumed that the species Microlaimus honestus De Man, 1922, Paramonohystera proteus Wieser, 1956 and Cyartonema germanicum Juario, 1972 are sensitive bioindicators of bad environmental statues and of hydrocarbon presence in the environment. On the other hand, Metoncholaimus pristiurus (Zur Strassen, 1894) Filipjev, 1918 would rather be classified as a positive bioindicative species of this type of pollutants.

scholarly journals Impact of forest harvesting on water quality and fluorescence characteristics of dissolved organic matter in eastern Canadian Boreal Shield lakes in summer

2015 ◽  
Vol 12 (23) ◽  
pp. 6999-7011 ◽  
Author(s):  
P. Glaz ◽  
J.-P. Gagné ◽  
P. Archambault ◽  
P. Sirois ◽  
C. Nozais
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Forest Harvesting ◽  
Spectroscopic Techniques ◽  
Clear Cutting ◽  
Fluorescence Measurements ◽  
Fluorescence Characteristics ◽  
Boreal Shield ◽  
Shield Lakes

Abstract. Forestry activities in the Canadian Boreal region have increased in the last decades, raising concerns about their potential impact on aquatic ecosystems. Water quality and fluorescence characteristics of dissolved organic matter (DOM) were measured over a 3-year period in eight eastern Boreal Shield lakes: four lakes were studied before, 1 and 2 years after forest harvesting (perturbed lakes) and compared with four undisturbed reference lakes (unperturbed lakes) sampled at the same time. ANOVAs showed a significant increase in total phosphorus (TP) in perturbed lakes when the three sampling dates were considered and in DOC concentrations when considering 1 year before and 1 year after the perturbation only. At 1 year post-clear cutting DOC concentrations were about 15 % greater in the perturbed lakes at ~ 15 mgC L−1 compared to 12.5 mgC L−1 in the unperturbed lakes. In contrast, absorbance and fluorescence measurements showed that all metrics remained within narrow ranges compared to the range observed in natural waters, indicating that forest harvesting did not affect the nature of DOM characterized with spectroscopic techniques. These results confirm an impact of forestry activities 1 year after the perturbation. However, this effect seems to be mitigated 2 years after, indicating that the system shows high resilience and may be able to return to its original condition in terms of water quality parameters assessed in this study.

scholarly journals Reducing the Impact of Forest Harvesting on the Vancouver Island Tourism Industry

2016 ◽  
Vol 92 (01) ◽  
pp. 101-111 ◽  
Author(s):  
Kyle W. Hilsendager ◽  
Howard W. Harshaw ◽  
Robert A. Kozak
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Forest Harvesting ◽  
Tourism Industry ◽  
Structured Interviews ◽  
Tourism Resource ◽  
Negative Impacts ◽  
Visual Impacts ◽  
The Impact ◽  
Industry Professionals

British Columbia forests have traditionally been managed for timber production. However, the increasing importance of nature-based tourism within the province means that forests also have significant value as a tourism resource. This can lead to conflicts between the forestry and tourism industries. This article examines tourism and forestry interests on Vancouver Island and discusses ways that forests could be managed to reduce negative impacts to the tourism industry. Eighteen semi-structured interviews were conducted with forestry and tourism industry professionals on Vancouver Island and elsewhere in British Columbia. Findings suggest that visual impacts associated with forestry can negatively impact tourism. It also appears that forestry receives a much higher priority than tourism when it comes to forest management, despite the vital importance of the tourism industry to the Vancouver Island economy. Displeasure over the lack of communication requirements between the forest industry and other stakeholders was also documented. The implementation of formal agreements between the two industries may potentially reduce conflicts between these two industries on Vancouver Island. Identification and special management of highly valuable tourism areas may also provide benefits to the Vancouver Island tourism industry.

scholarly journals Influence of Plantation Establishment on Discharge Characteristics in a Small Catchment of Tropical Forest

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Siti Aisah Shamsuddin ◽  
Zulkifli Yusop ◽  
Shoji Noguchi
Keyword(s):  
Water Yield ◽  
Plantation Establishment ◽  
Forest Plantation ◽  
Small Catchment ◽  
Forested Catchment ◽  
Clear Cut ◽  
Clear Cutting ◽  
Before And After ◽  
Hopea Odorata ◽  
The Impact

A study was conducted on the impact of forest clearance on discharge from newly established Hopea odorata plantations catchment (14.4 ha). The stands were two years old when this study commenced in year 2006 and the data collection was carried out for two years. The forested catchment (C3) was clear-cut during the preparation of the forest plantation and catchment C1 was left undisturbed. Discharge and rainfall were measured continuously for two years. The discharge measured from years 1997 to 2003 was used also to determine the water yield before and after forest clear-cut. This study showed that the plantation catchment is more responsive to storm with higher total water yield than in the forested catchment. The effect of forest clear cutting to discharge was clearly shown by the increment in the amount following the clear-cut activities and time taken for the recovery of the discharge back to its original state was almost three years. The peak discharge in C3 also was affected in which the biggest change was obtained during the forest clear-cutting period compared with during calibration and after clearing periods. This study is useful as basis for improving the existing guidelines on forest plantation establishment.

scholarly journals Humic fractions as indicators of soil organic matter responses to clear-cutting in the mountain and lowland conditions of south-western Poland

2021 ◽  
Author(s):  
Elzbieta Jamroz ◽  
Maria Jerzykiewicz
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Negative Impact ◽  
Forest Harvesting ◽  
Temperate Climate ◽  
Mountain Forest ◽  
Semiquinone Radical ◽  
Mountain Regions ◽  
Clear Cutting ◽  
Humic Fractions

Clear-cutting means forest removing (stem only) and is the most common type of forest harvesting but undoubtedly has a negative impact on the C budget in soils. This work aimed to describe responses of soil organic matter in the forest soils to forest removing under temperate climate conditions of lowland and mountain regions in south-western Poland. Using advanced instrumental analysis, like EPR, 1H NMR and FT-IR spectroscopy it has been found that clear-cutting, alters C cycling and accelerates decomposition in the forest floor leading to loss of humic fractions in the investigated soils. In the mountain forests the more labile, low-molecular fulvic fraction decreased as the effect of harvesting practice. The transformation of organic matter after clear-cutting resulted in the loss of less humified organic matter containing humic substances of less polymerised molecules. Analysis of the semiquinone radical structures and concentrations showed a decrease in radical concentration observed for HA from mountain clear-cut areas compare to the undisturbed forest. Results presented in this paper have proved less aliphatic character of humic acid molecules from the lowlands, compared to the mountain forest as the effect of clear-cutting. Harvesting practices in mountain regions should be approached with particular care due to the risk of erosion of exposed surfaces and soils containing less humified and less stable organic matter than in the lowlands. Humic fractions of higher solubility, less stability and tendency to migrate through the soil profile may favour the leaching of nutrients and consequently cause the eutrophication of waters.

Ion Export from a Small British Columbia Watershed After Forest Harvesting

2007 ◽  
Vol 42 (3) ◽  
pp. 162-171 ◽  
Author(s):  
Richard N. Nordin ◽  
Zhanxue Zhu ◽  
Asit Mazumder
Keyword(s):  
British Columbia ◽  
Fold Increase ◽  
Forest Harvesting ◽  
Watershed Model ◽  
Major Cations ◽  
Term Change ◽  
Before And After ◽  
Calcium Magnesium ◽  
Coastal British Columbia ◽  
Chemistry Parameter

Abstract A small coastal British Columbia lake was monitored before and after approximately 11% of the watershed was logged. There was an increase in the concentrations of most of the ions measured in the lake water after logging. Peak concentrations occurred two to three years after logging and most ions returned to background concentrations in five to eight years. Two methods were used to estimate the increased export of ions resulting from the forest harvesting. The first method used a water chemistry / hydrology watershed model, and the second used the changes in lake concentrations to calculate watershed input. The changes in ion concentrations and export varied with model and chemistry parameter with a change from a 1.3- to 4.2-fold increase for major cations and anions like calcium, magnesium, sodium, and chloride, to a 5- to 35-fold increase in ion export for nitrate and ammonium. The export of nitrogen from the watershed has implications for both water quality and future forest productivity. The measurement of lake ion increase is proposed as a general means of evaluating longer term change or disturbance in a watershed.

scholarly journals Effect of Shelterwood and Clear-Cutting Regeneration Method on Wood Density of Scots Pine

Forests ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 868
Author(s):  
Ondřej Schönfelder ◽  
Aleš Zeidler ◽  
Vlastimil Borůvka ◽  
Lukáš Bílek ◽  
Jan Vítámvás
Keyword(s):  
Scots Pine ◽  
Lower Layer ◽  
Test Material ◽  
Uniform Density ◽  
Annual Rings ◽  
Gradual Decline ◽  
The Czech Republic ◽  
Clear Cutting ◽  
Before And After ◽  
The Impact

With the gradual decline in the proportion of spruce as the most important tree species in the Czech Republic, the importance of pine will increase. The test material for this study was selected from two localities with important representation of pure Scots pine stands. Two stands, representing clear-cutting and shelterwood regeneration methods were selected from each locality. In the case of shelterwood method, tree samples from a lower layer were cut down and subsequently evaluated in terms of the impact of the regeneration method on the density of the wood, the density of earlywood and latewood, the proportion of latewood and the width of the annual rings. These qualitative parameters of the wood were compared before and after the release of the parent stand canopy. The clear-cutting regeneration method served as a reference. The values obtained before the release of the parent stand canopy are significantly different from values after its removal (share of latewood 47.7% and 48.1% before the release in contrast to 39.5% and 39.1% after the release for the locality 1 and the locality 2 respectively). The shelterwood regeneration method has not a significant impact on the overall investigated characteristics. Most significant was the impact of the regeneration method on the distribution of properties along the trunk radius, where the shelterwood method shows a uniform density distribution from the pith to the bark. From the view of industry, therefore, it is not important for the final processing which part of the trunk the wood comes from.

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