Habitat suitability of Gymnocladus assamicus - A critically endangered plant of Arunachal Pradesh, India using machine learning and statistical modeling
Ujjal Deka BaruahActa Ecologica Sinica , 2022 , https://doi.org/10.1016/j.chnaes.2022.05.009
Abstract:
The present study sought to identify the potential distribution range of critically endangered Gymnocladus
assamicus in Arunachal Pradesh based on published data and fild collection. We used the Maxent model to
estimate the range of distribution and the result was then compared with three other models, i.e., the Generalized Linear Model (GLM), the Bioclim and the Random Forest model to assess the species' habitat suitability. A total of 23 different environmental variables were used, including bioclimatic ones, monthly minimum and maximum temperature, monthly precipitation and elevation data. The Maxent output listed 12 variables explaining 99.9% variation in the model. In comparison, Maxent showed the maximum region under habitat suitability criteria (1884.48 km2), followed by Random Forest (70.73 km2) and Bioclim (11.62 km2) model. Except for the Maxent model, suitable habitats predicted by other models are highly restricted within and across the study species' current distribution range. The average model prediction shows an expanded distribution range for the species up to Tawang which is the closest district of currently known distribution of the species in the state. Thus, the present study recognizes the importance of the geographic range of G. assamicus, a critically endangered species with very limited spatial distribution range and also provides some specifi details to explore possible habitats for the species in new areas of potential occurrence in Arunachal Pradesh, India.
Spatio-temporal characterization of tropospheric ozone and its precursor pollutants NO2 and HCHO over South Asia
Ujjal Deka BaruahScience of The Total Environment , vol: 809 , 151135, 2022 , https://doi.org/10.1016/j.scitotenv.2021.151135
Abstract:
In recent decades, South Asia has experienced declining air quality, with much of the attention being focused on extremely high levels of particulate matter. Here, we analyze tropospheric ozone (O3), formaldehyde (HCHO), and nitrogen dioxide (NO2) to assess other measures of air quality across South Asia from 2008 to 2018. The IASI-Forli retrieved tropospheric ozone data was validated with ozonesonde, reanalysis (ERA5), satellite (TES), and model simulation products (GEOS-Chem and TOMCAT/SLIMCAT). Space-based observations of these three trace gases were used to conduct a spatio temporal analysis over South Asia using trend analysis (Theil-Sen and linear regression), change-point detection (Pettitt's test), and hotspot identification (Getis-Ord Gi*). We used the formaldehyde-nitrogen dioxide ratio (FNR) to identify NOx limited, VOC limited, and transitional regimes in South Asia. Counter to previous studies, a statistically significant decrease of HCHO (−0.0041 DU yr−1) and O3 (−0.064 DU yr−1) was detected for South Asia; however, NO2 is increasing the 0.001 DU yr−1 over South Asia during 2008–18. The Indo-Gangetic Plains emerged as being critically affected by the three trace gases. Certain parts of southern and south-eastern India are gradually emerging as NO2 and HCHO hotpots. No significant O3 hotspots were discernible, though coldspots existed along the Himalaya belt of India, Nepal, and Bhutan and mountainous tracts of Pakistan. FNR indicates the reduction of NOx in NOx-limited regime of the Indo-Gangetic Plains reduced the formation of tropospheric O3 over South Asia.
Distress Migration and Involuntary Return During Pandemic in Assam: Characteristics and Determinants
Girimallika BorahIndian Journal of Labour Economics , 2022 , doi.org/10.1007/s41027-022-00392-8
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Spatial Distribution and Trend Estimation of Tropospheric Formaldehyde: A Space-Borne Observation Over South Asia
Ujjal Deka Baruah & Nitashree MiliEnvironmental Change in South Asia , 171-185, 2022 , https://doi.org/10.1007/978-3-030-47660-1_9
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This chapter deals with the distribution and recent changes of tropospheric formaldehyde as measured from space borne sensors aboard Aura/OMI satellite of 0.1° × 0.1° spatial resolution during 2008–2018 over South Asia. The concentration of formaldehyde is mainly concentrated in the Indo-Gangetic Plains of South Asia spanning Afghanistan, Bangladesh, Bhutan, India, Nepal, Pakistan and Sri Lanka. Thiel-Sen’s analysis indicates a decreasing trend (−0.004 DUyr−1) during the study period.
When the Bough Breaks: Spatial Variability of Tropospheric Ozone in the Indian Sub-continent
Ujjal Deka BaruahIn: Saikia, A., Thapa, P. (eds) Environmental Change in South Asia. Springer, Cham , 2022 , https://doi.org/10.1007/978-3-030-47660-1_11
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Tropospheric or ground level ozone (O3) is an important greenhouse gas and a pollutant harmful to human health and agricultural activity. With high population pressure in the Indian Sub-continent and economies heavily reliant on agriculture and allied activities tropospheric ozone is problematic. This analysis assesses the spatial variability of tropospheric ozone using monthly AIRX3STM satellite data during 2002–16. The monthly images were combined and averaged to derive month-wise and four season-wise aggregates during 2002–2016 in order to understand monthly and seasonal variations in the spatial patterns of O3. A gain coefficient image was also generated using a GIS to visualize and depict areas with spatial variability of O3 during the period.
Agro-Climatic Constraints and the Adaptive Empirical Knowledge System of Indigenous Farmers in Assam, India
Ujjal Deka BaruahTraditional Ecological Knowledge of Resource Management in Asia , 333–348, 2023 , https://doi.org/10.1007/978-3-031-16840-6_20
Abstract:
There exists a symbiotic relationship between climate change, farmers, and crops. Assam has faced innumerable floods and sporadic drought-like situations since time immemorial. This chapter deals with the inter-relationship among the variables and assesses the constraints in agriculture and indigenous farmers’ knowledge system of adaptation measures to cope with climate change. Erosion and sedimentation that are a fallout of flooding have adversely affected the agricultural landscape in some areas of Assam. A survey was carried out in five agro-ecological zones of Assam to assess the agro-climatic constraints and farmers’ ecological knowledge systems. India Meteorological Department (IMD) data (1971–2011) was used to evaluate the climatic variability and change in Assam. Assam witnessed changes in the main crop or varieties of crops like the change of total cropped area under winter (“Sali”) rice, etc. On the other hand, peanuts, jute, pulses, maize, sugarcane, and watermelon were introduced. A gradual rise in area under boro rice followed by a decrease in area under sali and autumn rice set in. In some parts of Central Brahmaputra Valley close to Brahmaputra River and its tributaries and the North Bank Plain Zone, farmers chose to replace the main crops sali rice (summer crop), and adopt “bao” rice (a water-resistant local rice breed) or oilseeds due to the vagaries of climate.
Distribution mapping of five threatened medicinally important plant species of Arunachal Himalaya
Kuladip Sarma,.., Ujjal Deka BaruahVegetos , 2023 , https://doi.org/10.1007/s42535-023-00619-z
Abstract:
Eastern Himalaya, one of the major hubs of plant diversity, is home to numbers of rare, endangered, and threatened plant species in general. The present study aims to study five selected threatened plant species found in Arunachal Pradesh, India for its distribution and potential habitat identification. An extensive field survey was carried out in the various pockets of the state of Arunachal Pradesh from March 2020 to July 2022, collecting GPS locations of five selected threatened plants viz., Paris polyphylla, Coptis teeta, Gymnocladus assamicus, Taxus wallichiana, and Amentotaxus assamica. A machine learning approach was adopted for mapping the diversity and endemism of these species in the study area. A machine learning approach was adopted for predicting the potential distribution of the five threatened species and then the high potential areas were combined to create a priority conservation area for all the species together. A total of 505 individuals of the five species were found in 108 locations in four districts of Arunachal Pradesh, India. The highest number of individuals was recorded for the species C. teeta spread over 20 different locations and the lowest was recorded for G. assamicus (18 individuals) in only 8 locations. The current distribution of five selected threatened plants in Arunachal Pradesh reveals an overlap in the geographic range of these species. The mapping of the distribution of five different important plant species enabled us to know the overall diversity patterns of these selected plants and would be helpful in the formulations of appropriate conservation strategies.
Urban livability and contextual uncertainties: An assessment of livability through the lens of urban dwellers in Guwahati, India
Anwesha Mahanta, Parijat BorgohainJournal of Infrastructure, Policy and Development, Singapore , vol: 6 , 2022 , 1395
Abstract:
Sustainable Ethnic Tourism Development in Arunachal Pradesh
Parijat Borgohain, Barnali Patowary/ Edited by Subhash Anand, Madhushree Das, Rituparna Bhattacharyya, R.B. Singh, published by SpringerSustainable development goals in North East India : Challenges and Achievements, International Geographical Union (IGU) Series: Advances in Environmental and Geographical Sciences, Springer Nature , 489-506, 2023
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Influence of Namghars in Assamese Society of Barpeta District of Assam
Shrabani Devi, Parijat BorgohainShodh Sarita , vol: 8 , 144-148, 2021
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Management of Namghar in Assam
Shrabani Devi, Parijat BorgohainShodh Sanchar , vol: 11 , 166-169, 2021
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Wellbeing in the aftermath of floods: Findings from a qualitative study in Bongaigaon District of Assam, India
Girimallika Borah, Nandita Saikia, Shyamanta Das, and Sanjeev SharmaWellbeing, Space and Society , 2023 , https://doi.org/10.1016/j.wss.2023.100147
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GIS‑based revised universal soil loss equation for estimating annual soil erosion: a case of lower Kulsi basin, India
Gitika ThakuriahSN Applied Sciences , vol: 5 , 2023 , https://doi.org/10.1007/s42452-023-05303-0
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Geographic information system and analytical hierarchical process approach for groundwater potential zone of lower Kulsi basin, India
Gitika ThakuriahSustainable Water Resources Management (2023) 9:85 , vol: 9 , 2023 , https://doi.org/10.1007/s40899-023-00870-x
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Geospatial and. Analytical Hierarchical Process approach for potential ssiyrs of water harvesting in lower Kilsi basin, India
Gitika ThakuriahGeoScape , vol: 17 , 58-73, 2023 , https://doi.org/10.2478/geosc-2023-0005
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HYV Rice Farming in Assam: Spatio-Temporal Patterns, Problems and Prospects.
Mala DuttaGeographical Review of India , vol: 71 , 32-43, 2009
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Environmental Status and Changing Landuse/Landcover of Kapla Beel in Barpeta District, Assam
Mala DuttaInternational Journal of Research and Analytical Reviews , vol: 6 , 314-322, 2019
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Crop Productivity Zones in Assam: A Geospatial Analysis
Mala DuttaNorth Eastern Geographers , vol: 42 , 78-90, 2022
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E-Waste Generation, Awareness and Management Policies in Higher Educational Institutions: A Case Study from Cotton University, Assam
Mala Dutta and Rani Kumari ShahIndian Journal of Natural Sciences , vol: 14 , 65897-65906, 2023
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Status of Horticulture in Lakhimpur District of assam with Special reference to Laluk and Narayanpur ADO Circle (Accepted)
Pranamika Bora, Mala Dutta and Rani Kumari ShahIndian Journal of Natural Scinces , vol: 14 , 2024
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Place of Rice Farming in Assamese Life and Culture
Mala DuttaCity, Society and Planning , vol: 2 , 359-373, 2007
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Agriculture
Mala DuttaGeography of Assam, Bhagabati, Bora, Kar (eds), First ed: 2001 , 169-189, 2001
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Women's Participation in Rice Faming in Assam
Mala DuttaConcerns and Voices: A Collection of Essay, Cotton College Women's Forum , vol: 1 , 2009
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Agricultural Landuse and Productivity in North-East India
Mala DuttaRecent Advances in Social Science Research: In the Context of India's North-East, Gogoi, Saikia (Eds) , 64-80, 2023
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Sericulture Farming in Udalguri, Assam: A Case Study of Sericulture Farming of Sapkhaity Farm
Mala DuttaExploring the North-East: Past, Present and Future, An edited volume of selected articles, Kalita, Sarma (eds) , vol: 1 , 116-135, 2021
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Geochemical Characteristics of Metasomatised Diorites in and around Umsopri of Ri-bhoi District, Meghalaya, India
Dr. Anamika Gogoi and Dr. Balen BhagabatyJournal of Geography, Environment and Earth Science International , vol: 15 , 1-14, 2018
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Mineral Chemistry and Geothermometry of Biotite in the Granitoids , Located in and around Jirang -Patharkhamah Area,Ri-Bhoi District,Meghalaya,India
Dr. Anamika Gogoi and Dr. Balen BhagabatyJournal of the Geological Society of India , vol: 98 , 245–259, 2022
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Reservoir characterization and rock eval pyrolysis of clastic sedimentary rocks in the Geku Formation, Arunachal Pradesh, North-eastern India
Bordoloi, A., Chutia, A., & Taye, C. D.Journal of The Indian Association of Sedimentologists , vol: Vol-40 (I) , 43–54, 2023 , https://doi.org/10.51710/jias.v40iI.284
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Petrography and clay mineral study of Siwalik Group, East Siang District, Arunachal Pradesh: Implications for tectonic setting and depositional environment
Chutia, A., Gogoi, M. P., Taye, C. D., and Bordoloi, A., 2022Indian Journal of Geosciences , vol: Vol-76 (4) , 371-384, 2022
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Petrography and geochemistry of Palaeogene sandstones of Geku Formation, Yinkiong Group, Arunachal Pradesh, NE India: implications on provenance and tectonic setting
Bordoloi, A, Chutia, A., Taye, C. D. and Gogoi, M. PJournal of Sedimentary Environments , vol: 7 (4) , 691-709, 2022 , https://doi.org/10.1007/s43217-022-00116-4
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Provenance of the Yinkiong Group exposed along Pasighat-Mariyang Road section, East Siang District, Arunachal Pradesh: A petrographic, heavy mineral and clay mineralogical approach
Chutia, A., Taye, C. D., Nath, D., and Chutia, D., 2019Indian Journal of Geosciences , vol: 73 (4) , 253-264, 2019
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Petrography of Tipam Sandstone Formation of Miocene Age from Upper Assam Basin, India- A Compositional and Diagenetic Approach to Decipher the Sedimentation History
Chutia, A and Sarma J.N., 101-115, 2021
Abstract: