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Assesments of forest water yield using satellite remote sensing technique due to landscape development in large tropical rainforest catchments for sustainable management

Hashim, Mazlan and Ibrahim, Ab. Latif and Ahmad, Samsudin and P. Ramlee, Helmi (2007) Assesments of forest water yield using satellite remote sensing technique due to landscape development in large tropical rainforest catchments for sustainable management. In: The 28th Asian Conference on Remote Sensing 2007, 12-16 November 2007, PWTC, Kuala Lumpur, Malaysia.

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Abstract

The increases in human population and rising standard of living, large fraction of forestland has been converted to agricultural and urban uses, thus the importance of the world remaining forests together with the challenge to manage and sustain this critical resource continue to increase. Tropical rainforest which harbour the highest diversity of species of all ecosystem of the world also experience massive changes due to deforestation. Recent deforestation of primary stands of tropical forest, especially lowland forests, is unprecedented so that much of what remains of primary lowland forests is now fragmented in isolated patches. The impacts of such large-scale removal of tropical forests are apt to be considerable, ranging from loss of soil nutrients and increased sedimentation into rivers and streams, loss of biodiversity and impacts to climate on a worldwide scale. Deforestation increases soil loss and sedimentation considerably with cumulative downstream effects. Previous hydrological research has tended to focus on small upstream catchments, generating more knowledge about in situ effects of land use upon water yield, water quality and nutrient losses and sedimentation. Much less is known about the cumulative effects downstream to be meaningful for management purposes. While results from small catchments studies show rapid hydrological recovery following selective logging, this does not necessarily follow for larger catchments of say 100km2 or more where sedimentation tends to exacerbate as it moves downstream. Up-scaling of results from small experimental catchments is often risky owing to large spatial and temporal variations in the hydrological variables. Hence, monitoring of hydrological variables over large catchments is necessary to fully capture the cumulative effects of land use activities in the upstream. This paper examines integrated Remote Sensing for assessment of forest water yield as an indicator of impact assessments of landscape development in large scale tropical rainforest catchments in Malaysia. This technique offers sound alternative approach for future management of water resources in Malaysia.

Item Type:Conference or Workshop Item (Other)
Uncontrolled Keywords:satellite remote sensing, hydrological, biodiversity
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Geoinformation Science And Engineering (Formerly known)
ID Code:4778
Deposited By: En. Tajul Ariffin Musa
Deposited On:02 Jan 2008 02:17
Last Modified:18 May 2011 10:00

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