DSpace Community: Assistant Professor, Chawlhhmun, Aizawl

Forest structure and tree diversity along an altitudinal gradient in Sikkim Himalaya

2024-12-22T00:00:00Z

Title: Forest structure and tree diversity along an altitudinal gradient in Sikkim Himalaya Authors: Vanlalhluna, P.C Abstract: The vegetation types of Sikkim Himalayas more particularly Southern Sikkim has not been studied before. This study is the first comprehensive one on the tree species diversity and composition across four forest types (Tropical semi evergreen forest (TSEF), Sub-tropical broad mixed leaved hill forest (STBLHF), Himalayan wet temperate forest (HWTF) and Sub alpine Forest (SAF) in the region. We employed quadrat sampling and all the trees > = 10 cm DBH at 1.37m height were considered for the purpose. A total of 130 tree species belonging to 91 genera and 52 families were recorded in the study sites of which Moraceae and Lauraceae represented the highest number of species (8 each). The tropical semi evergreen forest (TSEF) harboured 61 species, followed by sub-tropical broad mixed leaved hill forest (STBLHF) (59), Himalayan wet temperate forest (HWTF) (43) and sub-alpine forest (SAF) (25). The Shannon-Weiner diversity index (H’) in TSEF, STBLHF, HWTF and SAF was 3.31, 2.92, 2.82, and 2.34 respectively. The H’ showed a linear relation with elevation (R2 = 0.9265, p < 0.05) and the Margalef’s species richness (S) indicated a significant quadratic relation (R2 = 0.9996, p < 0.05) with elevation. A hump-shaped pattern was observed for tree species richness while the DBH size class showed a reverse J shaped pattern. It concluded that tree species diversity in South Sikkim Himalayas is primarily influenced by elevation, showing a linear decline in H′ and a hump-shaped pattern for species richness, peaking at mid-elevations. The reverse J-shaped DBH distribution indicates active regeneration, further supporting the observed diversity pattern.

Management effect on crop yield in a Gmelina arborea based agroforestry system in humid tropic of northeast India

2008-06-01T00:00:00Z

Title: Management effect on crop yield in a Gmelina arborea based agroforestry system in humid tropic of northeast India Authors: Vanlalhluna, P.C

Indigenous Technologies and Local Climate Change Adaptation Practices around East Kawlchaw Watershed, Saiha, Mizoram: A Case Study

2018-06-01T00:00:00Z

Title: Indigenous Technologies and Local Climate Change Adaptation Practices around East Kawlchaw Watershed, Saiha, Mizoram: A Case Study Authors: Vanlalhluna, P.C Abstract: The technologies that are employed by the native inhabitants in a region which forms an important part of its culture and heritage may be called as indigenous technologies. These technologies are drawn from the indigenous knowledge that is unique to a given culture or society and are basis for locallevel decision making in agriculture, health care, food preparation, natural resource management and other activities in rural communities (Warren 1991). These technologies are basically intended to enhance the ability to maintain & renew balance and harmony within a multidimensional environment (Waas et al., 2011; Oxfam 2011). Although indigenous peoples’ traditional ways of living have very little to contribute to climate change,

Assessment of air quality at the municipal waste dumping site in Aizawl, Mizoram

2013-06-07T00:00:00Z

Title: Assessment of air quality at the municipal waste dumping site in Aizawl, Mizoram Authors: Vanlalhluna, P.C Abstract: A study was done on the air quality of the Tuirial municipal dumping site in Aizawl, Mizoram, India. The air quality for suspended particulate matter (SPM), respirable suspended particulate matter (RSPM), NO2 and SO2 was analysed for a period of one year during 2011-2012. The study was undertaken under the aegis of MIPOGRASS (Mizo Post Graduate Science Society) and the Directorate of Science and Technology, Government of Mizoram. The SPM and RSPM concentra-tions were to a great extent above the permissible limit of the the National Ambient Air Quality Standard (NAAQS) by the Central Pollution Control Board (CPCB) throughout the study period. The highest SPM mean concentration was on April 2012 at 789.64 (SD ± 1172.73) μg/m3 and highest RSPM on November 2011 at 1345.99 (SD ±1 08.29) μg/m3. The mean concentration of NO2 also showed above permissible limits for four months with highest on March 2012 at 43.62 (SD ± 8.19) μg/m3. The SO2 showed highest concentration at 1.95 (SD ± 0.57) μg/m3 which was within the permissible limit throughout the study period.