Study on Implementing Ecohydrological Approaches Towards Sustainable Management in Peatlands: Hydrophysics of peat as affected by water table fluctuation under different land uses of ombrotropic peatlands

Kurnain, Ahmad and Afiah , Hayati (2016) Study on Implementing Ecohydrological Approaches Towards Sustainable Management in Peatlands: Hydrophysics of peat as affected by water table fluctuation under different land uses of ombrotropic peatlands. Project Report. Universitas Lambung Mangkurat . (Unpublished)

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Abstract

Important findings of the present study in relation with the implementation of ecohydrological approaches toward sustainable management of peatlands are as follow: • Characteristics of hydrophysical properties of peat materials were varied with different land uses. Peat bulk density of rubber-cultivated peatland was higher than that of oil palm-cultivated and abandoned areas. This is true because rubber cultivation needs more compacted peatland surface for supporting the growth of rubber tree. The average total porosity varied from a low of 54% in the acrotelm layer of rubber-cultivated peatland to a high of 83% in the intermediate layer of oil palm-cultivated peatland. Total porosity values showed the same results as bulk density values since they are inversely related to one another. Positions that had the highest porosity also had the lowest bulk density and vice versa. • Characteristics of water retention and hydraulic conductivity of unsaturated peat layers were varied with different land uses. Water retention curve shows that more decomposed peats in the rubber cultivated peatland lose their water relatively slowly at small negative pressure heads, while less decomposed peats in the oil palm-cultivated and abandoned peatlands lose their water more quickly. This reflects difference of pore-size distribution among different land uses of peatlands. Majority of pores in less decomposed peats have larger diamaters and thus drain at relatively small negative pressure or operationally at relatively shallow water table. This phenomenon is also applied to acrotelm and intermediate peat layers that are different decomposed states. • Hydraulic conductivity of acrotelm and intermediate peat layers in the rubber-cultivated, oil palm-cultivated and abandoned peatlands was varied with a function of volumetric water contents. Notice that the hydraulic conductivity at saturation is lower for more decomposed peats in the rubber-cultivated peatland than less decomposed peats in the oil palm-cutivated and abandoned peatlands. Also showed that the hydraulic conductivity decreases significantly as the peat layer becomes unsaturated. Decreased hydraulic conductivity in the rubber-cutivated peatland was related to decreased effective porosity. It also implies that unsaturated peat layers in the oil palm and abandoned peatlands are easily drained when water table decreases.

Item Type: Monograph (Project Report)
Subjects: S Agriculture > S Agriculture (General)
Depositing User: Mr Arief Mirathan - Eka Setya Wijaya
Date Deposited: 01 Aug 2017 08:11
Last Modified: 01 Aug 2017 08:11
URI: http://eprints.unlam.ac.id/id/eprint/2032

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