Dissolved organic carbon from three ecosystems in tropical peatland of Sarawak Malaysia

Gan H.Y., . and Mohd. Hanafi M., . and Melling L., . (2007) Dissolved organic carbon from three ecosystems in tropical peatland of Sarawak Malaysia. [Proceedings Paper]

Decompostion humification and stabilization of soil organic matter SOM are closely related to dissolve organic matter DOM. Apparently the DOM is closely related to dissolve organic carbon DOC. Estimation of the degree of peat humification has frequently been determined using sodium pyrophosphate solubility index extracting solution. Currently there was no simple procedure to determine the quality of tropical peatland to produce CO2. A study was conducted to determine the relationship between the potential of tropical peatland to produce carbon dioxide as measured by the sodium pyrophosphate solubility index PSI and dissolved organic carbon DOC from 3 ecosystems on tropical peatland in Mukah Sarawak. Composite peat samples at two depths 0.025 and 25-50 cm were collected from three ecosystems forest sago and oil palm ecosystems. The samples were analyzed using the 0.025M sodium pyrophosphate extracting solution PSI for the determination on humification; the DOC for water solube C and Fourier Transform-Infrared FTIR spectroscopy for identification of functional groups. The PSI values varied markedly between the three ecosystems with the highest in forest ecosystems with the highest in forest ecosystems 229.855.66-231.975.42 and the lowest in the oil palm plantation 95.820.91-62.491.69. Similar trend in the values of DOC were also obtained in all the three ecosystems 0.090.013-0.120.03. Oil palm and sago ecosystems contained similar functional groups amines ketones carboxylic acids alkanes aldehydes and alkynes. The sub-soil of sago and forest top soil contained phenyl ring substitution overtones and alkane groups; and forest sub-oil contained amines and alkynes groups. These results suggest that the trend of the carbon dioxide emission produced from tropical peatland is related to the labile C present in each ecosystem.

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Abstract

Decompostion humification and stabilization of soil organic matter SOM are closely related to dissolve organic matter DOM. Apparently the DOM is closely related to dissolve organic carbon DOC. Estimation of the degree of peat humification has frequently been determined using sodium pyrophosphate solubility index extracting solution. Currently there was no simple procedure to determine the quality of tropical peatland to produce CO2. A study was conducted to determine the relationship between the potential of tropical peatland to produce carbon dioxide as measured by the sodium pyrophosphate solubility index PSI and dissolved organic carbon DOC from 3 ecosystems on tropical peatland in Mukah Sarawak. Composite peat samples at two depths 0.025 and 25-50 cm were collected from three ecosystems forest sago and oil palm ecosystems. The samples were analyzed using the 0.025M sodium pyrophosphate extracting solution PSI for the determination on humification; the DOC for water solube C and Fourier Transform-Infrared FTIR spectroscopy for identification of functional groups. The PSI values varied markedly between the three ecosystems with the highest in forest ecosystems with the highest in forest ecosystems 229.855.66-231.975.42 and the lowest in the oil palm plantation 95.820.91-62.491.69. Similar trend in the values of DOC were also obtained in all the three ecosystems 0.090.013-0.120.03. Oil palm and sago ecosystems contained similar functional groups amines ketones carboxylic acids alkanes aldehydes and alkynes. The sub-soil of sago and forest top soil contained phenyl ring substitution overtones and alkane groups; and forest sub-oil contained amines and alkynes groups. These results suggest that the trend of the carbon dioxide emission produced from tropical peatland is related to the labile C present in each ecosystem.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal S590.2 S683 2007 Call Number
AGROVOC Term:	PEATLANDS
AGROVOC Term:	SOIL ORGANIC MATTER
AGROVOC Term:	ECOSYSTEMS
AGROVOC Term:	CARBON DIOXIDE
AGROVOC Term:	EMISSION
AGROVOC Term:	SARAWAK
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:13
URI:	http://webagris.upm.edu.my/id/eprint/10896

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