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Chakraborty, Kasturi

The Expansion and Impact of Cement Manufacturing Units and Mining Areas in Lumshnong, Jaintia Hills, Meghalaya

Recognizing the Rapid Expansion of Rubber Plantation – A Threat to Native Forest in Parts of Northeast India

Abstract Views :478 | PDF Views:189

Authors

Kasturi Chakraborty ¹, S. Sudhakar ¹, K. K. Sarma ¹, P. L. N. Raju ¹, Ashesh Kr. Das ²

Affiliations
1 North Eastern Space Applications Centre, Umiam 793 103, IN
2 Department of Ecology and Environmental Science, Assam University, Silchar 788 011, IN

Source

Current Science, Vol 114, No 01 (2018), Pagination: 207-213

Abstract

With the current trend of land use/land cover (LULC) change taking place globally, several parts of northeast India are also showing signs of change in LULC pattern leading to forest loss. This study focusses on the expansion of monoculture rubber plantation (Hevea brasiliensis) in selected sub-watersheds in north-east India, and distributed in parts of north Tripura, Mizoram and a major portion in the Karimganj district of Assam. Remote sensing and GIS technique has been used to map and analyse the extent of rubber plantation using temporal IRS LISS III satellite data from 1997 to 2013. It has been observed that rubber plantation increased from 4.47 sq. km to 28.42 sq. km in various parts of the study area. The expansion was more rapid during recent times, i.e. during 2010 to 2013. The plantation took place in dense forest, open forest and degraded forest areas. The spread of the plantation was also observed in one reserved forest located within the study area. There are several instances of negative impacts of rubber plantation expansion in Southeast Asia. Similar expansion of rubber plantation has been observed in northeast India as well. Further spread of rubber plantations in the region needs to be regulated to avoid conversion of dense and reserved forest areas by fostering use of mixed cropping methods instead of rubber monocultures, and by adopting more sustainable land use and management practices.

Keywords

Northeast India, Remote Sensing and GIS, Rubber Plantation.

Full Text

References

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Li, H., Ma Y., Aide, T. M. and Liu, W., Past, present and future land-use in Xishuangbanna, China and the implications for carbon dynamics. For. Ecol. Manage, 2008, 255, 16–24.

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Fox, J. M., Castella, J. C., Ziegler, A. D. and Westlay, S. B., Rubber plantation expand in mountainous southeast Asia: what are the consequences for the environment? Asia Pacific Issues, Analysis from the East-West Centre, 2014, p. 114.

Oku, E., Iwara, A. and Ekukinam, E., Effects of age of rubber (Hevea brasiliensis Muell Arg.) plantation on pH, organic carbon, organic matter, nitrogen and micronutrient status of ultisols in the humid forest zone of Nigeria, Kasetsart. J. Nat. Sci., 2012, 46, 684–693.

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Forest Biometric Parameter Extraction using Unmanned Aerial Vehicle to Aid in Forest Inventory Data Collection

Abstract Views :392 | PDF Views:119

Authors

Kasturi Chakraborty ¹, Victor Saikom ¹, Suranjana B. Borah ¹, Mamita Kalita ¹, Chirag Gupta ¹, Laishram Ricky Meitei ², K. K. Sarma ¹, P. L. N. Raju ¹

Affiliations
1 North Eastern Space Applications Centre, Umiam 793 103, IN
2 Botanical Survey of India, ERC, Shillong 793 003, IN

Source

Current Science, Vol 117, No 7 (2019), Pagination: 1194-1199

Abstract

Frequent ground surveys and satellite-based information on tree height, canopy gaps and forest dynamics are limited by time, cost and spatial scales. In this study, an attempt has been made to derive forest biometric parameter on tree height by canopy height model and crown area projections using unmanned aerial vehicles (UAV)–RGB image. Sorensen’s coefficient has been used as an index to compare between ground inventory and UAV-based species identification. The statistical paired t-test showed UAV RGB can be used for maximum tree height and tree crown extraction to aid in ground surveys.

Keywords

Canopy Height Model, Canopy Area Projection, Forest Biometry, Unmanned Aerial Vehicles.

Full Text

References

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Lizardite–chrysotile veins from Vempalle Formation of Cuddapah Supergroup, India: a study in fluid–rock interaction

Abstract Views :310 | PDF Views:141

Authors

Kasturi Chakraborty ¹, Praveer Pankaj ², Prabir Kumar Mukhopadhyay ³, Sandip Nandy ⁴

Affiliations
1 Geological Survey of India, Khanij Bhavan, Jaipur 302 004, IN
2 Geological Survey of India, Seminary Hills, Nagpur 440 006, IN
3 AD-18/5, Sector-I, Salt Lake City, Kolkata 700 064, IN
4 Geological Survey of India, Dharitri Building, Sector V, Salt Lake City, Kolkata 700 091, IN

Source

Current Science, Vol 122, No 7 (2022), Pagination: 826-839

Abstract

Much work has been done on hydrothermal alteration and serpentinization of high-magnesian bulks like dunite or peridotite. In contrast, serpentinization of dolomite has received scant attention. In this study we focus on a system of nearly monomineralic intersecting veins comprising serpentine or epidote or calcite developed within Vempalle dolomite of unmetamorphosed Cuddapah Supergroup of rocks, Eastern Dharwar Craton, India. Our studies show that hydrothermal alteration under moderately low temperature, low pressure and moderate silica activity can lead to extensive serpentinization of the dolomitic host. Development of talc can occur under increased silica activity at similar P–T conditions. We also explore the mechanism of formation of chrysotile veins, epidote veins and calcite veins that transect the lizardite which replaces dolomite

Keywords

Dolomite, fluid–rock interaction, lizardite and chrysotile veins, silica activity.

Full Text

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Estimation of above-ground biomass and delineation of vegetation of tropical forests using EOS-04 data

Abstract Views :158 |

Authors

Anup K. Das ¹, C. Patnaik ¹, Saroj Maity ¹, M. S. S. Praveen ², R. Suraj Reddy ², G. Rajashekar ², Nilima R. Chaube ¹, Seema Mahajan ³, Yashraj Jain ⁴, Dhruval Bhavsar ⁵, Kasturi Chakraborty ⁵, Deepak Putrevu ¹

Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
3 Indus University, Ahmedabad 381 115, IN
4 ACL Digital – Reliance Jio, Navi Mumbai 400 701, IN
5 North Eastern Space Applications Centre, Umiam 793 103, IN

Source

Current Science, Vol 126, No 9 (2024), Pagination: 1088-1101

Abstract

The C-band SAR on-board EOS-04 mission provides unique opportunities to characterize forest vegetation through its sensitiveness to vegetation structure and all-weather imaging capability over regions of perpetual cloud cover. The present study has brought out the applications of EOS-04 data for estimation of above-ground biomass (AGB) of tropical deciduous forests and scrublands, mapping of forest cover and delineation of mangroves vegetation. The study suggested that EOS-04 data can be used for mapping AGB of tropical scrublands and low density forests of AGB £ 80 t/ha. The overall RMSE for all vegetation with AGB £ 80 t/ha was 15.3 t/ha (R2 – 0.49). It was shown that the integration of EOS-04 and Sentinel-2 data improved AGB estimates across biomass ranges of 0–245 t/ha (RMSE – 21.60 t/ha and 0.81). EOS-04 data was also found to be useful for the delineation of mangroves and forest vegetation using machine-learning algorithms. The study supports operational use of EOS-04 data for estimation of AGB over low biomass tropical forests and scrublands

Keywords

Above-ground biomass, C-band SAR, forest cover, mangrove vegetation, MRS data, random forest regression, tropical forests.

Full Text

Evaluation of the influence of land-use and land-cover changes on ecosystem services in Deepor Beel Ramsar Site using high resolution remote sensing

Abstract Views :193 |

Authors

Sameer Mandal ¹, Kasturi Chakraborty ², Biman Kr. Dutta ³

Affiliations
1 North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, IN
2 North Eastern Space Applications Centre, Umiam 793 103, IN
3 North Eastern Council, Meghalaya, Shillong 793 003, IN

Source

Current Science, Vol 126, No 9 (2024), Pagination: 1159-1165

Abstract

It is important to assess the rapid land-use/land-cover change (LULCC) and its impact on ecosystem service value (ESV), affecting the socio-economic and climatic stabilization of wetlands. In this study, a multi-resolution image segmentation and k-nearest neighbours algorithm were used for the thematic classification of satellite images of 2003 and 2018 in the Deepor Beel wetland, a lake of international significance. A notable increase in built-up areas was observed from 9.07 to 32.19 sq. km during this period. Proximity analysis in the 500 m buffer from the Deepor Beel boundary revealed an increasing built-up areas in close proximity. The ESV evaluation estimated a net decrease in the monetary value of 4.85 ´ 104 USD of the wetland for the respective years. The study recommends strict demarcation of zones of influence on the ground and regular monitoring of LULCC to protect important wetlands and preserve their ecosystem services

Keywords

Land-use/land-cover change, remote sensing, image segmentation, wetland ecosystem service value.

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