The loss and generation of groundwater NO3– and SO42– of tropical peatland

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The loss and generation of groundwater NO3– and SO42– of tropical peatland

Setiari Marwanto1*), Supiandi Sabiham2
1Indonesian Soil Research Institute,
Bogor Agricultural University
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Abstract

 

 The existence of NO3– and SO42– in groundwater of tropical peatland determines the quality of peatland and potentially affects the surrounding ecosystems. This research aimed to determine the loss and generation of groundwater NO3– and SO42– of inland peat in West Kalimantan, and the factors affecting those processes. Three research plots were located in oil palm (Elaeisguineensis Jacq.) plantation (OP) while one plot was established in a secondary forest (SF). Water samplings were conducted fortnightly from 50 and 200 cm depths with three replications for each plot. Environmental factors monitored included daily rainfall and weekly groundwater level. This research showed that NO3– generation occurred in the presence of oxygen. The higher concentration of in OP than in SF was attributed to a more oxidized(aerobic) condition in OP than in SF. The lowering of groundwater level during the dry season in October 2015 increased the formation of NO3– and SO42– . In the wet season, the loss of NO3– and SO42– were affected by movement of groundwater both laterally and vertically. The loss dramatically increased when the drained peat was washed by the high intensity rainfall. The rise of groundwater level increased peat moisture and subsequently increased nitrification and SO42– generation. NO3– and SO42–  found in the anaerobic layer were derived from those generations in aerobic layer.

Keywords: NO3– and SO42– , groundwater, oil palm plantation, tropical peatland


 

 

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BALAI PENELITIAN LINGKUNGAN PERTANIAN

Indonesian Agricultural Environment Research Institute (IAERI)

 


 

A. Wihardjaka (1) and L.J. Wade (2)
(1)Research Station of Agricultural Environment Preservation

(2)International Rice Research Institute

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