Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Acknowledgements
- Part I General perspectives
- Part II Regional floristic and animal diversity
- Part III Hydrometeorology of tropical montane cloud forest
- Part IV Nutrient dynamics in tropical montane cloud forests
- Part V Cloud forest water use, photosynthesis, and effects of forest conversion
- 47 Transpiration and microclimate of a tropical montane rain forest, southern Ecuador
- 48 Physiological variation in Hawaiian Metrosideros polymorpha across a range of habitats: from dry forests to cloud forests
- 49 Environmental controls on photosynthetic rates of lower montane cloud forest vegetation in south-western Colombia
- 50 Comparative water budgets of a lower and an upper montane cloud forest in the Wet Tropics of northern Australia
- 51 Effects of forest disturbance and regeneration on net precipitation and soil water dynamics in tropical montane rain forest on Mount Kilimanjaro, Tanzania
- 52 Changes in soil physical properties after conversion of tropical montane cloud forest to pasture in northern Costa Rica
- 53 Hydrology and land-cover change in tropical montane environments: the impact of pattern on process
- Part VI Effects of climate variability and climate change
- Part VII Cloud forest conservation, restoration, and management issues
- References
53 - Hydrology and land-cover change in tropical montane environments: the impact of pattern on process
from Part V - Cloud forest water use, photosynthesis, and effects of forest conversion
Published online by Cambridge University Press: 03 May 2011
Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Acknowledgements
- Part I General perspectives
- Part II Regional floristic and animal diversity
- Part III Hydrometeorology of tropical montane cloud forest
- Part IV Nutrient dynamics in tropical montane cloud forests
- Part V Cloud forest water use, photosynthesis, and effects of forest conversion
- 47 Transpiration and microclimate of a tropical montane rain forest, southern Ecuador
- 48 Physiological variation in Hawaiian Metrosideros polymorpha across a range of habitats: from dry forests to cloud forests
- 49 Environmental controls on photosynthetic rates of lower montane cloud forest vegetation in south-western Colombia
- 50 Comparative water budgets of a lower and an upper montane cloud forest in the Wet Tropics of northern Australia
- 51 Effects of forest disturbance and regeneration on net precipitation and soil water dynamics in tropical montane rain forest on Mount Kilimanjaro, Tanzania
- 52 Changes in soil physical properties after conversion of tropical montane cloud forest to pasture in northern Costa Rica
- 53 Hydrology and land-cover change in tropical montane environments: the impact of pattern on process
- Part VI Effects of climate variability and climate change
- Part VII Cloud forest conservation, restoration, and management issues
- References
Summary
ABSTRACT
This chapter examines the details of land-use impacts on the hydrology of tropical montane forest at the watershed scale, with particular reference to the Tambito area in south-western Colombia. In a series of model experiments a watershed-scale, GIS-based, dynamic hydrological model was used to simulate the hydrological impacts of progressive deforestation as a result of expansion of the agricultural frontier. The simulations were driven by 52 separate iterations of a cellular automaton-based land-use change model. Model results were analyzed to understand the changing sensitivity of total runoff and erosion to forest loss as deforestation occurred in different parts of the watershed. Sensitivity was calculated for each output variable as the change in the value of the output variable between two successive model iterations divided by the area of land deforested in those iterations. The results indicated an exponential increase in the sensitivity of these processes to deforestation beyond a threshold of 60% forest loss in the watershed. The patterns of sensitivity at a particular iteration of the cellular automaton tended to reflect: (i) the landscape properties of the area remaining under forest, (ii) the soil properties of both forested and deforested areas, and (iii) the location of the deforestation front relative to high-order streams and important lateral hydrological links within the watershed.
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- Information
- Tropical Montane Cloud ForestsScience for Conservation and Management, pp. 516 - 524Publisher: Cambridge University PressPrint publication year: 2011
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