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51 - Effects of forest disturbance and regeneration on net precipitation and soil water dynamics in tropical montane rain forest on Mount Kilimanjaro, Tanzania

from Part V - Cloud forest water use, photosynthesis, and effects of forest conversion

Published online by Cambridge University Press:  03 May 2011

By
M. Schrumpf ,
H. V. M. Lyaruu ,
J. C. Axmacher ,
W. Zech  and
L.A. Bruijnzeel
Edited by
L. A. Bruijnzeel ,
F. N. Scatena  and
L. S. Hamilton
M. Schrumpf
Affiliation:
Max Planck Institute for Biogeochemistry, Germany
H. V. M. Lyaruu
Affiliation:
University of Dar es Salaam, Tanzania
J. C. Axmacher
Affiliation:
University College London, UK
W. Zech
Affiliation:
University of Bayreuth, Germany
L.A. Bruijnzeel
Affiliation:
VU University, Netherlands
L. A. Bruijnzeel
Affiliation:
Vrije Universiteit, Amsterdam
F. N. Scatena
Affiliation:
University of Pennsylvania
L. S. Hamilton
Affiliation:
Cornell University, New York
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Summary

ABSTRACT

The montane rain forest belt on Mt. Kilimanjaro forms an important water source for northern Tanzania that is threatened by both logging and fire. The aim of this study was to investigate consequences of forest fragmentation on various aspects of the water cycle. Soil properties, rainfall, throughfall, and soil water suction were analyzed for mature forest, secondary forest patches, and large clearings. A total of 10 plots located on the south-western slopes of the mountain between 2100 and 2300 m.a.s.l. were monitored from May 2000 until June 2002. Annual rainfall amounts ranged from 2000–2600 mm and showed high spatial and inter-annual variability. Rainfall interception ranged from 3% to 9% of incident rainfall in clearings to a maximum of 32% in forests. In general, soils under mature forest were wettest and showed only minor moisture fluctuations through the year. Soils of secondary forest sites were driest and soil water suction exhibited the largest fluctuations. The difference between the two forest types may reflect a combination of differences in interception, evaporation from the forest floor, and transpiration, because ventilation and radiation penetration can be expected to be enhanced in fragmented secondary forest. In clearings the higher throughfall and presumably lower transpiration rates led to moister conditions compared to adjacent secondary forest sites. Top-soil sand contents of the Andisols differed between sites, with disturbed sites having higher sand contents and consequently lower water contents at similar soil water suctions than did mature forest sites. […]

Type
Chapter
Information
Tropical Montane Cloud Forests
Science for Conservation and Management
 , pp. 491 - 501
Publisher: Cambridge University Press
Print publication year: 2011

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