scholarly journals Assessment of the CLASlite forest monitoring system in detecting disturbance from selective logging in the Selva Maya, Mexico

Silva Fennica ◽  
2019 ◽  
Vol 53 (1) ◽  
Author(s):  
Irving Hernández-Gómez ◽  
Carlos Cerdán ◽  
Angélica Navarro-Martínez ◽  
Dinora Vázquez-Luna ◽  
Samaria Armenta-Montero ◽  
...  
Keyword(s):  
Monitoring System ◽  
Forest Disturbance ◽  
Road Construction ◽  
Timber Harvesting ◽  
Selective Logging ◽  
Reference Points ◽  
Forest Monitoring ◽  
Landsat Images ◽  
Community Forests ◽  
Logging Impacts

Detecting and monitoring forest disturbance from selective logging is necessary to develop effective strategies and polices that conserve tropical forests and mitigate climate change. We assessed the potential of using the remote sensing tool, CLASlite forest monitoring system, to detect disturbance from timber harvesting in four community forests () of the Selva Maya on the Yucatan Peninsula, Mexico. Selective logging impacts (e.g. felling gaps, skid trails, logging roads and log landings) were mapped using GPS in the 2014 annual cutting areas (ACAs) of each ejido. We processed and analyzed two pre-harvest Landsat images (2001 and 2013) and one post-harvest image (November 2014) with the CLASlite system, producing maps of degraded, deforested and unlogged areas in each ACA. Based on reference points of disturbed (felling and skidding), deforested (log landings and roads) and unlogged areas in each ACA, we applied accuracy assessments which showed very low overall accuracies (<19.1%). Selective logging impacts, mainly from log landings and new logging road construction, were detected in only one ejido which had the highest logging intensity (7 m ha).ejidos3–1

scholarly journals Monitoring selective logging with Landsat satellite imagery reveals that protected forests in Western Siberia experience greater harvest than non-protected forests

2017 ◽  
Vol 44 (2) ◽  
pp. 191-199 ◽  
Author(s):  
ALEXANDER SHCHUR ◽  
EUGENIA BRAGINA ◽  
ANIKA SIEBER ◽  
ANNA M. PIDGEON ◽  
VOLKER C. RADELOFF
Keyword(s):  
Protected Areas ◽  
Satellite Imagery ◽  
Western Siberia ◽  
Forest Disturbance ◽  
Timber Harvesting ◽  
Selective Logging ◽  
Local Economy ◽  
Natural Forests ◽  
Landsat Images ◽  
Protected Forests

SUMMARYWhen timber harvesting is an important source of local income and forest resources are declining, even forests that are designated as protected areas may become vulnerable. Therefore, regular monitoring of forest disturbance is necessary to enforce the protection of forest ecosystems. However, mapping forest disturbance with satellite imagery can be complicated if the majority of the harvesting is selective logging and not clearcuts. Our goal was to map both selective logging and clearcuts within and outside of protected areas in Western Siberia, a region with a highly developed timber industry. Combining summer and winter imagery allowed us to accurately estimate not only clearcuts, but also selective logging. Winter Landsat images substantially improved our classification and resulted in a highly accurate forest disturbance map (97.5% overall accuracy and 86% user accuracy for the rarest class, clearcuts). Selective logging and stripcuts were the dominant disturbance types, accounting for 96.3% of all forest disturbances, versus 3.7% for clearcuts. The total annual forest disturbance rate (i.e. disturbance rate for clearcuts, stripcuts and selective logging together) was 0.53%, but total forest disturbance within protected areas was greater than in non-protected forest (0.66% versus 0.50%, respectively), and so was the annual rate of selective logging (i.e. without clearcuts, 0.37% versus 0.25%, respectively). Our results highlight that monitoring only clearcuts without assessing selective logging might result in significant underestimation of forest disturbance. Also, when timber harvesting is important for the local economy and when protected areas have valuable timber resources that have already been depleted elsewhere, then additional protection may be necessary in order to maintain natural forests within protected areas. We suggest that this is the situation in our study area in Western Siberia right now and is likely the situation in many other parts of the globe as well.

scholarly journals Congo Basin forest loss dominated by increasing smallholder clearing

2018 ◽  
Vol 4 (11) ◽  
pp. eaat2993 ◽  
Author(s):  
Alexandra Tyukavina ◽  
Matthew C. Hansen ◽  
Peter Potapov ◽  
Diana Parker ◽  
Chima Okpa ◽  
...  
Keyword(s):  
Population Growth ◽  
Large Scale ◽  
Forest Cover ◽  
Forest Type ◽  
Forest Disturbance ◽  
Timber Harvesting ◽  
Selective Logging ◽  
Congo Basin ◽  
Small Scale ◽  
Forest Loss

A regional assessment of forest disturbance dynamics from 2000 to 2014 was performed for the Congo Basin countries using time-series satellite data. Area of forest loss was estimated and disaggregated by predisturbance forest type and direct disturbance driver. An estimated 84% of forest disturbance area in the region is due to small-scale, nonmechanized forest clearing for agriculture. Annual rates of small-scale clearing for agriculture in primary forests and woodlands doubled between 2000 and 2014, mirroring increasing population growth. Smallholder clearing in the Democratic Republic of the Congo alone accounted for nearly two-thirds of total forest loss in the basin. Selective logging is the second most significant disturbance driver, contributing roughly 10% of regional gross forest disturbance area and more than 60% of disturbance area in Gabon. Forest loss due to agro-industrial clearing along the Gulf of Guinea coast more than doubled in the last half of the study period. Maintaining natural forest cover in the Congo Basin into the future will be challenged by an expected fivefold population growth by 2100 and allocation of industrial timber harvesting and large-scale agricultural development inside remaining old-growth forests.

A Real-time Forest Monitoring System for Environmental Engineering Data Applications

2020 ◽  
Vol 51 (2) ◽  
pp. 03-04
Author(s):  
Raven Boxman
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Criminal Behavior ◽  
Environmental Engineering ◽  
Forest Monitoring ◽  
Safe Haven ◽  
The Earth ◽  
Engineering Data ◽  
To Come ◽  
Two Stages

The woods environment is basic for providing common assets to the greenery. The woods is an indispensable safe-haven, albeit at present it is presented to illicit logging by insatiable individuals, and this has altogether influenced the woodland. Because of this criminal behavior, unfortunate wonder has surfaced. Consequently, the system of this exploration is worried about building up a far off observing gadget that could catch basic ongoing information, for example, temperature, moistness, vaporous substance, and bonfire and downpour location, which could show the recent and the safeguarded characteristic state and environment in the woods. The model was actualized at chosen areas to screen and assemble information at two stages. The results from this exploration will be utilized in the advancement of a progression of games as instructing helps that can make mindful our group of people yet to come about the consumption and its effect upon the earth.

Logging impacts on forest carabid assemblages in Japan

2005 ◽  
Vol 35 (11) ◽  
pp. 2698-2708 ◽  
Author(s):  
Naoya Osawa ◽  
Atsumi Terai ◽  
Keiichi Hirata ◽  
Asami Nakanishi ◽  
Ayumi Makino ◽  
...  
Keyword(s):  
Small Area ◽  
Niche Breadth ◽  
Negative Impact ◽  
Forest Disturbance ◽  
Carabid Beetles ◽  
Large Carnivores ◽  
Experimental Station ◽  
Logging Impacts ◽  
Number Of Individuals ◽  
Potential Food

We hypothesized that small-area logging (<1 ha) would greatly affect microhabitats of carabid beetles. To test this hypothesis, we studied the carabid assemblages at Kamigamo Experimental Station, Kyoto, Japan, from June 1999 to May 2001. From the analysis of the number of individuals and niche breadth, the numbers of large carnivores (Carabus dehanii Chaudoir, Carabus maiyasanus Bates, and Carabus yaconinus Bates) and large insectivores (Chlaenius posticalis Motschulsky and Haplochlaenius costiger (Chaudoir)) decreased because of logging, whereas the small carabids, Synuchus arcuaticollis (Motschulsky) and Synuchus cycloderus (Bates), may not have been negatively influenced by logging. The mass of the FH layer significantly affected the total number of Pterostichus latemarginatus (Straneo) and marginally affected the number of S. cycloderus. However, soil water content (%) and the mass of the L layer did not affect the total number of individuals in any species. The results of this study imply that (1) the richness of the FH layer and vegetation, that is, the potential food abundance and habitat richness, is involved in determining species richness and the density of the carabid assemblages and (2) even small-area logging may have a negative impact on the density of the large predatory carabids, which are sensitive indicators of forest disturbance.

Phenology Modelling and Forest Disturbance Mapping with Sentinel-2 time series in Austria

2020 ◽  
Author(s):  
Markus Löw ◽  
Koukal Tatjana
Keyword(s):  
Time Series ◽  
Bark Beetle ◽  
Forest Ecosystems ◽  
Forest Disturbance ◽  
Spatial Scales ◽  
Data Access ◽  
Forest Monitoring ◽  
Forest Disturbances ◽  
Disturbance Dynamics ◽  
Sentinel 2

Abstract Background Worldwide, forests provide natural resources and ecosystem services. However, forest ecosystems are threatened by increasing forest disturbance dynamics, caused by direct human activities or an altering natural environment. It is decisive to trace the intra- to trans-annual dynamics of these forest ecosystems. National to local forest communities request detailed area-wide maps that delineate forest disturbance dynamics at various spatial scales. Methods We developed a remote sensing based time series analysis (TSA) framework that comprises data access, data management, image pre-processing, and an advanced but flexible TSA. The data basis is a dense time series of multispectral Sentinel-2 images with a spatial resolution of 10 metres. We use a dynamic Savitzky-Golay-filtering approach to reconstruct robust but sensitive phenology courses. Deviations from the latter are further used to derive spatiotemporal information on forest disturbances. In a first case study, we apply the TSA to map forest disturbances directly or indirectly linked to recurring bark beetle infestation in Northern Austria. Finally, we use zonal statistics on different spatial scales to provide aggregated information on the extent of forest disturbances between 2018 and 2019.Results and Conclusion The outcomes are a) individual phenology models and deduced phenology metrics for each 10 metres by 10 metres forest pixel in Austria and b) forest disturbance maps useful to investigate the occurrence, development and extent of bark beetle infestation. The phenology modelling results provide area-wide consistent data, also useful for downstream analyses (e.g. forest type classification). Results of the forest disturbance detection demonstrate that the TSA is capable to systematically delineate disturbed forest areas. Information derived from such a forest monitoring tool is highly relevant for various stakeholders in the forestry sector, either for forest management purposes or for decision-making processes on different levels.

Towards an Operational Forest Monitoring System for Central Africa

2012 ◽  
pp. 97-110 ◽  
Author(s):  
Nadine T. Laporte ◽  
Tiffany S. Lin ◽  
Jacqueline Lemoigne ◽  
Didier Devers ◽  
Miroslav Honzák
Keyword(s):  
Monitoring System ◽  
Central Africa ◽  
Forest Monitoring

scholarly journals The Effects of Selective Logging Behaviors on Forest Fragmentation and Recovery

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Xanic J. Rondon ◽  
Graeme S. Cumming ◽  
Rosa E. Cossío ◽  
Jane Southworth
Keyword(s):  
Forest Fragmentation ◽  
Spatial Patterns ◽  
Management Practices ◽  
Timber Harvesting ◽  
Selective Logging ◽  
Forest Landscape ◽  
Intermediate Scale ◽  
Scale Interactions ◽  
Predator Prey Model ◽  
Forest Resilience

To study the impacts of selective logging behaviors on a forest landscape, we developed an intermediate-scale spatial model to link cross-scale interactions of timber harvesting, a fine-scale human activity, with coarse-scale landscape impacts. We used the Lotka-Volterra predator-prey model with Holling’s functional response II to simulate selective logging, coupled with a cellular automaton model to simulate logger mobility and forest fragmentation. Three logging scenarios were simulated, each varying in timber harvesting preference and logger mobility. We quantified forest resilience by evaluating (1) the spatial patterns of forest fragmentation, (2) the time until the system crossed a threshold into a deforested state, and (3) recovery time. Our simulations showed that logging behaviors involving decisions made about harvesting timber and mobility can lead to different spatial patterns of forest fragmentation. They can, together with forest management practices, significantly delay or accelerate the transition of a forest landscape to a deforested state and its return to a recovered state. Intermediate-scale models emerge as useful tools for understanding cross-scale interactions between human activities and the spatial patterns that are created by anthropogenic land use.

Mixed method approaches to evaluate conservation impact: evidence from decentralized forest management in Tanzania

2014 ◽  
Vol 42 (2) ◽  
pp. 162-170 ◽  
Author(s):  
JENS FRIIS LUND ◽  
NEIL D. BURGESS ◽  
SHABANI A. O. CHAMSHAMA ◽  
KLAUS DONS ◽  
JACK A. ISANGO ◽  
...  
Keyword(s):  
Forest Management ◽  
Mixed Method ◽  
Management Practices ◽  
Forest Disturbance ◽  
Good Condition ◽  
Policy Outcomes ◽  
Landsat Images ◽  
Forest Condition ◽  
Before And After ◽  
Forest Use

SUMMARYNearly 10% of the world's total forest area is formally owned by communities and indigenous groups, yet knowledge of the effects of decentralized forest management approaches on conservation (and livelihood) impacts remains elusive. In this paper, the conservation impact of decentralized forest management on two forests in Tanzania was evaluated using a mixed method approach. Current forest condition, forest increment and forest use patterns were assessed through forest inventories, and changes in forest disturbance levels before and after the implementation of decentralized forest management were assessed on the basis of analyses of Landsat images. This biophysical evidence was then linked to changes in actual management practices, assessed through records, interviews and participatory observations, to provide a measure of the conservation impact of the policy change. Both forests in the study were found to be in good condition, and extraction was lower than overall forest increment. Divergent changes in forest disturbance levels were in evidence following the implementation of decentralized forest management. The evidence from records, interviews and participatory observations indicated that decentralized management had led to increased control of forest use and the observed divergence in forest disturbance levels appeared to be linked to differences in the way that village-level forest managers prioritized conservation objectives and forest-based livelihood strategies. The study illustrates that a mixed methods approach comprises a valid and promising way to evaluate impacts of conservation policies, even in the absence of control sites. By carefully linking policy outcomes to policy outputs, such an approach not only identifies whether such policies work as intended, but also potential mechanisms.

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