© Kamla-Raj 2014 J Biodiversity, 5(1,2): 11-32 (2014) Hydrological Responses at Regional Scale to Landscape Dynamics T.V. Ramachandra Energy and Wetlands Research Group, Centre for Ecological Sciences Indian Institute of Science, Bangalore 560 012, India Fax: 91-080-23601428 / 23600085 / 23600683 [CES TVR] E-mail:
[email protected],
[email protected] KEYWORDS Land Use. Land Cover. Western Ghats. Tropical Ecosystems. Stream Flow ABSTRACT Western Ghats is the primary catchment for most of the rivers in peninsular India. Pristine forests in this region are rich in biodiversity and are being cleared due to unsound developmental activities. Rapid land-use changes have undermined the hydrological conditions, there by affecting all the components in the hydrological regime. The development programs based on ad-hoc decisions, is posing serious challenges in conserving fragile ecosystems. These changes have adversely affected the hydrological regime of river basins resulting in diminished river / stream flows. This necessitates conservation of ecosystems in order to sustain the biodiversity, hydrology and ecology. In this situation, in order to resolve present problems and to avoid a future crisis, a comprehensive assessment of land use changes, its spatial distribution and its impact on hydrological regime was carried out to explore appropriate remedial methods for the sustainable utilization management of natural resources. INTRODUCTION the hydrological cycle. This requires under- standing of hydrological components and its Developing countries in the tropics are fac- relation to the land use/land cover dynamics. ing threats of rapid deforestation due to un- The reactions or the results are termed hydro- planned developmental activities based on ad- logical response and depends on the interplay hoc approaches and also due to policies and between climatic, geological and land use vari- laws that considers forest as national resource ables (Ramachandra et al.