Abstract
Information on methane emission in pineapple cultivation on peatlands is scarce. Methane emission in pineapple cultivation is important as 90% of pineapples are grown on the peat soils of Malaysia. It is essential to determine methane emission in pineapple cultivation because pineapples are Crassulacean acid metabolism plants whose effects on methane could be different from other crops grown on tropical peat soils. Methane emissions from root respiration, microbial respiration, and oxidative peat decomposition were determined in a lysimeter experiment. There were three treatments: peat soil cultivated with pineapple, bare peat soil, and bare peat soil fumigated with chloroform. Methane emissions from peat soil cultivated with pineapple, bare peat soil, and bare peat soil fumigated with chloroform were 0.65 t/ha/yr, 0.75 t/ha/yr, and 0.75 t/ha/yr, respectively. The lower methane emissions are consistent with the general believe that methane emission from cultivated peat soils is lower than those of anaerobic or water logged peat soils. Soil methane emission was affected by nitrogen fertilization under pineapple cultivation but the converse was true for soil temperature nor soil moisture.
Highlights
Tropical peatlands cover approximately 27.1 million hectares in Southeast Asia (Hoojier et al, 2010) out of which 2.6 million hectares of these soils are located in Malaysia (Ismail & Jamaludin, 2007)
There were three treatments: peat soil cultivated with pineapple, bare peat soil, and bare peat soil fumigated with chloroform
Methane emissions from peat soil cultivated with pineapple, bare peat soil, and bare peat soil fumigated with chloroform were 0.65 t/ha/yr, 0.75 t/ha/yr, and 0.75 t/ha/yr, respectively
Summary
Tropical peatlands cover approximately 27.1 million hectares in Southeast Asia (Hoojier et al, 2010) out of which 2.6 million hectares of these soils are located in Malaysia (Ismail & Jamaludin, 2007). Approximately 600, 000 hectares of the peat soil in Malaysia are cultivated with oil palm, pineapple, rubber, and sago (Ismail, 2008). Tropical peat soils are soils formed through the accumulation of partially decayed woody plant materials under waterlogged condition. In their natural state, tropical peats emit methane (CH4). Both disturb and undisturbed peatlands are sources of atmospheric CH4. Tropical peat soils are waterlogged under natural condition This condition restricts diffusion of atmospheric oxygen into peats. This inhibits microbial decomposition of organic materials (Chimner & Cooper, 2003). Microorganism are not able to metabolize organic matter into CO2 instead, anaerobic degradation of carbon is carried out by methanogens to produce CH4 (Parmentier, van der Molen, de Jeu, Hendriks, & Dolman, 2009)
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