scholarly journals Ecological Impact of Forest Trails in Khadimnagar National Park, Sylhet, Bangladesh

Forestist ◽  
2021 ◽  
Author(s):  
Minhajur Rahman ◽  
◽  
Mohammed Mohammed ◽  
Anup Datta ◽  
◽  
...  
Keyword(s):  
National Park ◽  
Ecological Impact

scholarly journals Die-off of Utah Juniper Natural Bridges National Monument

1991 ◽  
Vol 15 ◽  
pp. 205-208
Author(s):  
Darrell Weber ◽  
David Nelson
Keyword(s):  
National Parks ◽  
National Park ◽  
Building Materials ◽  
Vegetation Type ◽  
Ecological Impact ◽  
Management Options ◽  
National Monument ◽  
Christmas Trees ◽  
Foliar Damage ◽  
Utah Juniper

The pinyon-juniper woodland is a wide spread vegetation type in the southwestern United States that is estimated to cover from 30 to 40 million hectares. They pinyon-juniper vegetation provides a source of fuel, building materials, charcoal, pine nuts, christmas trees and folk medicines. About 80% of the acreage is grazed by livestock and wildlife. In Utah, this ecosystem is a large component (62,705 km2 or 28.6%) of the vegetation. Particularly in the Utah National Parks, the pinyon-juniper woodlands valued for their watershed, aesthetic and recreational values. Over the past several years extensive foliar damage to Utah juniper (Juniperus osterosperma (Torr.) Little) has been observed in the Natural Bridges National Monument. The characteristic pattern is for the distal foliage to become chlorotic and die. Mortality progresses along twigs until whole branches or even the entire tree dies. Reports of similar foliar damage has been reported in Canyonlands National Park, Arches National Park, Mesa Verde National Park, Colorado National Monument, areas near Cedar City in southwestern Utah and in eastern Nevada, which would indicate that the foliar damage is a widespread problem. The cause for the foliar damage is unknown. The loss of juniper trees in the national parks in southern Utah would have a dramatic ecological impact and would be an aesthetic blight in the parks. The purpose of this investigation is to determine the cause of the die-off of Utah junipers and suggest management options concerning the juniper die-off problem.

scholarly journals Evaluation of the Ecological Impact of Human Settlement on Trees in Oban and Okwangwo Forests of Cross River National Park, Nigeria

2019 ◽  
pp. 1-11
Author(s):  
Onen Ibiang Onen ◽  
Celestin Uzoma Agoura ◽  
Charles Chidozie Iheukwumere ◽  
Joseph Olalekan Olasan ◽  
Andrew Ashieta Aboh
Keyword(s):  
National Park ◽  
Ecological Impact ◽  
T Test ◽  
Ecological Impacts ◽  
Human Settlement ◽  
Significance Level ◽  
Cross River ◽  
The Core ◽  
Level Of Significance ◽  
Data Collections

The ecological impacts of human settlement on trees in Oban and Okwangwo Forests of Cross River National Park located in Nigeria was carried out in the park with the view of providing  information on the activities of the support zones and enclave communities in both (Oban and Okwangwo) divisions of the park. Surveillance tours were carried out in company of the park rangers in the park and enclave communities. Each division was divided into two (2) zones each (core and peripheral) for ease of coverage. Plots were randomly selected in each study site at regular number of paces (fixed interval) to avoid coincidence. Data collections and observations were carried out for a period of four (4) months in both divisions. Random Sampling method was used for the study. Eight (8) plots of size 50 each were marked out using wooden pegs with red ribbon tied across the pegs in the core zones in both divisions (Oban and okwangwo). Same was applicable to the peripheral zones in both divisions giving a total number of 32 plots. The total number of trees per plot was determined by direct stem count and trees with 30 cm girth and above was considered for the count. The total number of trees counted in the core zones was (Oban 141 and Okwangwo 162) and the peripheral zones (Oban 120 and Okwangwo 127). Descriptive statistics was applied on the data to determine the mean, standard deviation and range. The T-test for tree counted in Oban (Table 3) reveals that Tcal(1.161)≤Ttab(2.365) and the difference had a mean of 3.875, TCal ≤ Ttab at 5% level of significance. The T-test for tree counts in Okwangwo (Table 6) shows that Tcal(3.040)≥Ttab(2.365),  TCal ≥ Ttab at 5% level of significance. F-statistics (Table 8) revealed a significance level in their differences, Ftab (p=0.05) df (7,7) = 3.79, FCal = 5.384. This calls for fast action on the resettlement of the enclave communities and provision of alternative sources of income for the support zones and enclave communities. Strategies should be adopted and improved upon if biodiversity is to be conserved. These strategies are embedded in increasing staff strength, well equipped and dedicated rangers as well as the absence of surrounding enclave communities.

scholarly journals Die-Off of Utah Juniper Natural Bridges National Monument

1992 ◽  
Vol 16 ◽  
pp. 167-171
Author(s):  
Darrell Weber ◽  
David Nelson
Keyword(s):  
National Parks ◽  
National Park ◽  
Ecological Impact ◽  
Management Options ◽  
Aesthetic Value ◽  
National Monument ◽  
Foliar Damage ◽  
Juniper Woodland ◽  
The Aesthetic ◽  
Utah Juniper

Utah junipers (Juniperus osterosperma (forr.)) are the dominant trees in the landscape of the southwestern states (35 million hectares). In Utah, the pinyon-juniper woodland represents 28.6% of the vegetation and are an important part of the aesthetic value of the Utah national parks. Over the past several years, extensive foliar damage has occurred to Utah juniper, yet little foliar damage has been observed in Natural Bridges National Monument, Canyonlands National Park, Arches National Park, Mesa Verde National Park and Colorado National Monument. The characteristic pattern is for the distal foliage to become chlorotic and die. Mortality progresses along twigs until whole branches or even the entire tree dies. The cause for the foliar damage is unknown. The loss of juniper trees in the national parks in southern Utah would have a dramatic ecological impact and would be an aesthetic blight in the parks. The purpose of this investigation is to determine the cause of the die-off of Utah junipers and suggest management options concerning the juniper die-off problem.

Evaluating the long-term project to eradicate the rangeland weed Martynia annua L.: linking community with conservation

2010 ◽  
Vol 32 (4) ◽  
pp. 407 ◽  
Author(s):  
Mark R. Gardener ◽  
Simone Cordell ◽  
Mark Anderson ◽  
Richard D. Tunnicliffe
Keyword(s):  
National Park ◽  
Ecological Impact ◽  
Northern Australia ◽  
Long Distance ◽  
Policy Makers ◽  
Institutional Leadership ◽  
Devil’S Claw ◽  
Novel Approach ◽  
Economic Criteria

Eradication of an invasive species is a holy grail sought by land managers, scientists and policy makers alike. This prize is particularly attractive to funding bodies that foresee a one-off investment to solve a problem. We evaluate a 20-year eradication project on the annual weed Martynia annua L. from remote Gregory (Jutburra) National Park in northern Australia. M. annua was regionally introduced in the 1860s and has since become naturalised and locally abundant on some pastoral properties. When land use changed from grazing to national park in the mid 1980s, M. annua was thought to be a serious problem. An eradication project was started in the late 1980s. Eradication of all individuals from within the National Park has not been successful but there have been other benefits of the project. We analysed operational, biological, social and economic criteria to find that the principal barriers to eradication were: occasional inaccessibility during the crucial seed production window; many widely dispersed small infestations; a perennial seed bank; and long-distance dispersal mechanisms. The two successes of the project were control of the weed to a level where ecological impact was negligible; and extensive community engagement. A novel approach adopted by the National Park, a biannual event called the Devil’s Claw Festival, has trained and educated hundreds of local, national and international people about biological invasions and conservation issues in remote northern Australia. Long-term institutional leadership and investment have been crucial for this project. We offer recommendations to policy makers embarking on eradication projects of widespread rangeland weeds.

Sign in / Sign up

Export Citation Format

Share Document