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Roy, Arijit
- Measuring Ecosystem Patterns and Processes through Fractals
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Authors
Affiliations
1 Department of Computer Science, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Banaras Hindu University, Varanasi 221 005, IN
3 Forestry and Ecology Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
1 Department of Computer Science, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Banaras Hindu University, Varanasi 221 005, IN
3 Forestry and Ecology Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
Source
Current Science, Vol 109, No 8 (2015), Pagination: 1418-1426Abstract
Changes in ecosystems are highly complex, heterogeneous and are extremely difficult to measure through single scale. Fractal geometry has been used to quantitatively estimate the extent of irregularity in ecosystem changes. However, in some cases it has been overly used giving misleading results. To avoid this, other metrics are also being used in studying changes in forest ecosystems. In this article, we review use of fractal geometry in measuring ecosystem components in a range of ecological conditions. Further, case studies from forest fragmentation and soil aggregates stability in different Indian tropical ecosystems with respect to management practices and environmental change have been described using fractal dimension. We have tried to point out some instances where fractals can more appropriately be used in assessing ecosystems properties and where it could not be successfully used. Characterization of ecological situations where fractals can effectively be used in general remains an important issue.Keywords
Ecosystem Complexity, Ecosystem Patterns, Fractal Dimension, Landscape Change, Soil Processes.Full Text
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- Land-Use Dynamics in Corbett National Park, Uttarakhand, India Using CA-Markov and Agent-Based LULC-SaarS Model
Abstract Views :216 |
PDF Views:77
Authors
Arijit Roy
1,
Pooja Rathore
1
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Department of Space, 4, Kalidas Road, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Department of Space, 4, Kalidas Road, Dehradun 248 001, IN
Source
Current Science, Vol 115, No 1 (2018), Pagination: 136-140Abstract
Corbett National Park (CNP), Uttarakhand, India is currently facing pressure of encroachments from human settlements around the buffer zone leading to increasing human and animal conflicts. In the present study, we have analysed the extent of land-use/landcover (LULC) changes between 1976 and 2011 using medium-spatial-resolution satellite data in and around CNP. Future projections have also been generated using CA-Markov and agent-based SaarS model. The study highlights that unlike in the past decades, the projected LULC may undergo restricted growth in built-up area agriculture.Keywords
Agent-Based Modelling, Buffer Zone, Landuse Dynamics, National Park.Full Text
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- COVID-19 Lockdown a Window of Opportunity to Understand the Role of Human Activity on Forest Fire Incidences in the Western Himalaya, India
Abstract Views :161 |
PDF Views:81
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4, Kalidas Road, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4, Kalidas Road, Dehradun 248 001, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 390-398Abstract
The global COVID-19 pandemic has resulted in a complete lockdown of economic activities and movement across the world. This provides an opportunity to evaluate the impact of minimal anthropogenic activities on forest fire occurrences in the Western Himalaya, India. Significant reduction of 83.4% in the cumulative fire incidences during 24 March to 5 May 2020 was observed in this region compared to the average of fire incidences during the corresponding period of 2006–20. Though during the current lockdown period, precipitation was high (~281 mm) compared to the average for the last 15 years (~125 mm), it did not contribute to the build-up of soil moisture. Comparatively higher NDVI (by 30.59%) and EVI (by 12.18%) in the lockdown phase unlike the average of previous years which showed declining trend, indicates that the lockdown provided an opportunity for the canopy to sustain and have higher vigour; this was not visible earlier due to fire incidences. The present study emphasizes that anthropogenic activities play a major role in forest fire incidences in this region.Keywords
Coronavirus-19, Forest Fire, Human Activity, Lockdown, Remote Sensing.Full Text