ABSTRACT
Effect of peat water levels on greenhouse gas production in different cropping land use

Anicetus Wihardjaka1, Mas Teddy Sutriadi1, Terry Ayu Adriany1, Nourma Al Viandari1, I Gusti Made Subiksa1, Asep Nugraha Ardiwinata2, and Elisabeth Srihayu Harsanti3*
 
Degraded peat has a high potential for use in agricultural production, especially food crops. The water table, which impacts the production of greenhouse gases (GHGs), is the main problem concerning peat utilization. The study aimed to determine the production of greenhouse gases at various peat water levels. The study was conducted in a laboratory setting utilizing the soil column of undisturbed peat soil. The factorial experiment was arranged in randomized block design, with three replicates, with the first factor was peat cropping use: Maize (Zea mays L.), pineapple (Ananas comosus (L.) Merr.), and scrubs. The second factor was water level (0, 10, 20, 30 cm depth). Variables measured were GHG flux (CO2 and CH4), pH, redox potential, total C content, and ash content. The peat cropping use interacted significantly with the peat water level on the potential for CH4 and CO2 production and the value of global warming potential. Water table depth significantly increased CO2 flux and global warming potential (GWP) in all three peat cropping uses. The lowest GWP at a 0 cm peat water level was 944 (pineapple use), 961 (maize use), and 1097 mg CO2e m-2 d-1 (scrub use). Peat for pineapple cultivation produces the lowest CO2 production and GWP compared to maize cultivation and scrubs. The negative relationship between redox potential and GWP is significant in peat for scrub. The relationship between pH and GWP is significant in peat for pineapple and scrub.
Keywords: Carbon dioxide, global warming potential, methane, peat soils, water level.
1Research Center for Food Crops, Research Organization for Agriculture and Food, National Research and Innovation Agency, Soekarno Science and Technology Area, Cibinong, Bogor 16915, West Java, Indonesia.
2Research Center for Estate Crops, Research Organization for Agriculture and Food, National Research and Innovation Agency, Soekarno Science and Technology Area, Cibinong, Bogor 16915, West Java, Indonesia.
3Research Center for Horticulture, Research Organization for Agriculture and Food, National Research and Innovation Agency, Soekarno Science and Technology Area, Cibinong, Bogor 16915, West Java, Indonesia.
*Corresponding author (esharsanti@gmail.com).