Partitioning Carbon Dioxide Emission and Assessing Dissolved Organic Carbon Leaching of a Drained Peatland Cultivated with Pineapple at Saratok, Malaysia

Abstract

Pineapples (Ananas comosus (L.) Merr.) cultivation on drained peats could affect the release of carbon dioxide (CO2) into the atmosphere and also the leaching of dissolved organic carbon (DOC). Carbon dioxide emission needs to be partitioned before deciding on whether cultivated peat is net sink or net source of carbon. Partitioning of CO2 emission into root respiration, microbial respiration, and oxidative peat decomposition was achieved using a lysimeter experiment with three treatments: peat soil cultivated with pineapple, bare peat soil, and bare peat soil fumigated with chloroform. Drainage water leached from cultivated peat and bare peat soil was also analyzed for DOC. On a yearly basis, CO2 emissions were higher under bare peat (218.8 t CO2 ha/yr) than under bare peat treated with chloroform (205 t CO2 ha/yr), and they were the lowest (179.6 t CO2 ha/yr) under cultivated peat. Decreasing CO2 emissions under pineapple were attributed to the positive effects of photosynthesis and soil autotrophic activities. An average 235.7 mg/L loss of DOC under bare peat suggests rapid decline of peat organic carbon through heterotrophic respiration and peat decomposition. Soil CO2 emission depended on moderate temperature fluctuations, but it was not affected by soil moisture.

Improving Nitrogen Availability on a Tropical Peat Soil Cultivated with Ananas comosus L. Merr. Using Pineapple Residue Ash

“…Total nitrogen, exchangeable ammonium, and available nitrate decreased with increasing depth because of decrease in the peat oxidation (with increasing water content). Ammonium and nitrate contents of the peat soil were higher than the reported range (Sim et al 2012;Choo and Ahmed 2014) because this present study was carried out on a cultivated sapric peat whereas that reported by Sim et al 2012…”

“…Bulk density and water holding capacity of the peat soil showed no significant difference with depth whereas soil moisture increased with increasing depth. Exchangeable ammonium and available nitrate results were higher than those in the literature (Choo and Ahmed 2014;Sim et al 2012).…”

“…Physico-chemical properties of the peat soil used in this present study (Table 2) were compared to those in the literature (Andriesse 1988;Choo and Ahmed 2014;MARDI 1996;Murtedza et al 2002;Sim et al 2012). pH, electrical conductivity, CEC, total nitrogen, and total organic carbon of the peat soil were consistent with those reported in the literature (Andriesse 1988;Choo and Ahmed 2014;MARDI 1996;Murtedza et al 2002). Bulk density and water holding capacity of the peat soil showed no significant difference with depth whereas soil moisture increased with increasing depth.…”

Effects of Substrate Composition on the Growth Traits of Grafted Seedling in Macadamia (Macadamia integrifolia) Nuts

“…These may be related to microbiome feedback during macadamia plant growth in these substrates [ 40 ]. Tropical peat soils are generally defined as soils formed by the accumulation of partially decayed woody plant materials under waterlogged condition [ 41 ]. Perlite and wood bran are commonly used in fruit and vegetables growth substrates [ 7 ].…”

Pineapple Residue Ash Reduces Carbon Dioxide and Nitrous Oxide Emissions in Pineapple Cultivation on Tropical Peat Soils at Saratok, Malaysia

“…Unlike the oil palm industry, where extensive studies had been carried out to measure greenhouse gas emissions from oil palm plantations on peat [11][12][13], less attention has been focused on drained peatlands under pineapples cultivation. Pineapples cultivation on peat soils in Malaysia was reported to release approximately 179.6 t CO 2 ha −1 yr −1 [14] and 15.7 t N 2 O ha −1 yr −1 [15]. While efforts had been carried out to quantify CO 2 and N 2 O emissions from tropical peat soils cultivated with pineapple [16][17][18][19], the effects of pineapple residue ash on CO 2 and N 2 O emissions from drained peat soils are yet to be determined in field and laboratory experiments.…”