Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Studies on the ecology of soil microarthropods in tropical semi evergreen forest and grassland in Cachar district Assam

Auteur : Singh, Salam Manoranjan

Université de soutenance : Assam University

Grade : Doctor of Philosophy (PhD) in Science 2014

Préface
Soil supports wide varieties of living component in the form of flora and fauna on earth. Arthropods are one of the major groups of soil fauna inhabiting soil and litter. Soil fauna constitute a very significant component of terrestrial eco-system where they play important role in the decomposition and in maintenance of soil fertility. Soil communities can have important effects on the structure of plant communities. Soil and litter arthropods aid in the regulation of rates of nutrient cycling, decomposition, and energy flow. The present study was based on the ecology of soil microarthropods population under four vegetational types of Cachar District, Assam i.e. Dorgakona Forest, Dorgakona Grassland, Silcoorie Forest and Silcoorie Grassland. The study was conducted for a period of two years (August, 2009 July, 2011). The data collected have been tabulated and analysed in the form of chapters including graphical representation of the data. Chapter 1 deals with general introduction, study sites and objective. Reviews of literature were discussed chronologically in Chapter 2. In Chapter 3 deals with faunal constituent of both soil and litter microarthropods were incorporated. Dynamics of different groups and effect of abiotic factors (i.e. relative humidity, rainfall and atmospheric temperature) on the population of soil and litter dwelling microarthropods using multiple correlation analysis were described in Chapter 4. Chapters 5 focused on community structure of microarthropods population. In this chapter Berger- Parker dominance, Shannon-Wiener diversity, Evenness index and Morisitas similarity index were analysed among the species level of both cryptositgmatid mites and collembola in soil and litter. Physico-chemical properties of soil and their influence in the dynamics of microarthropod population were described in Chapter 6. Chapter 7 deals with litter decomposition, nutrient released and mineralization pattern. In Chapter 8 general discussion was analysed. List of references were incorporated in Chapter 9. Major findings of the study were discussed under the heading Abstract of the thesis.

Présentation et version intégrale (Shodhganga)