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Accueil du site → Doctorat → Inde → 2014 → Evaluation of litter dynamics of two tropical tree species in natural tropical dry forest ecosystem and under elevated CO2 condition

Banaras Hindu University (2014)

Evaluation of litter dynamics of two tropical tree species in natural tropical dry forest ecosystem and under elevated CO2 condition

Apurva

Titre : Evaluation of litter dynamics of two tropical tree species in natural tropical dry forest ecosystem and under elevated CO2 condition

Auteur : Apurva

Université de soutenance : Banaras Hindu University

Grade : Doctor of Philosophy (PhD) in Environmental Science 2017

Résumé
1. Human activities are rising the concentrations of troposphere atmospheric CO2 and this in turn causes global climate change. Intensification of global change in climate has deep impacts on function and structure of forest ecosystems. Moreover, the increase in atmospheric CO2 is likely to alter the chemical characteristics of tree foliage and leaf litter and its inputs to forest soils. Litter reflects resource quality (substrate) for organisms that are responsible for decomposition and thereby alteration in litter chemistry will lead to change in soil carbon and nutrient dynamics.
2. Ecological restoration of degraded lands is necessary in current scenario for sustainable development of environment. Restoration through natural system i.e through species in forests provides an eco-friendly approach. However, to understand biological potential of species in soil restoration through natural forest it was essential to evaluate litter fall production, decomposition rate, temporal variation and nutrient release.
3. Changes in atmosphere could strongly influence terrestrial ecosystems functioning by altering nutrient cycling. Therefore, it is critical to understand the characterizing variations in leaf litter in response to environmental change as these alterations influence forest productivity through changes in soil organic matter content and carbon dynamics in ecosystem. A variation in plant litter under the effects of elevated CO2 (e-CO2) is determined as a critical factor of ecosystem feedback to changing atmospheric CO2 concentrations. In this study we studied how the dynamics of litter chemistry and nutrient release responded to important atmospheric changes preferably to rising atmospheric CO2.
4. The broad objective of the present study was to study litter chemistry of dominant tree S. robusta, T. grandis, H. binnata, B.monosperma and one dry mix in natural tropical dry forest of Sonebhadra and also to study the impact of e-CO2at Free air CO2 enrichment (FACE) utility on litter dynamics of two selected species and changes in major soil properties. The specific objectives were (i) to study the seasonal variation in litter fall, total amount of litter production, nutrient content in standing litter and variation in decomposition rate of selected species in natural forest of Sonebhadra (ii) to evaluate the litter fall, litter chemistry, decomposition rate, nutrient use efficiency, nutrient release and the changes in rhizospheric region of two species i.e Butea onosperma (Butea) and Tectona grandis (Teak) under the effect of e- CO2 at FACE utility, CSIRNational Botanical Research Institute, Lucknow
5. The study was conducted at two sites, i.e. (i) Natural forest in Vindhyan region of Sonebhadra districts in Uttar Pradesh, (ii) FACE utility, CSIR- NBRI, Lucknow.

Présentation et version intégrale (Shodhganga)

Page publiée le 5 février 2021