Changes in carbon and inorganic nutrients after clear felling a rainforest in Malaysia and planting with Acacia mangium

Nykvist N., . and Sim B. L., . Changes in carbon and inorganic nutrients after clear felling a rainforest in Malaysia and planting with Acacia mangium. pp. 98-112. ISSN 0128-1283

The amounts of organic C and N P K Ca and Mg in the biomass and soils were investigated in two catchments in Sabah Malaysia that had formerly supported a dipterocarp rainforest before it was clear felled and planted with Acacia mangium. Trees in one catchment (W4) were manually felled and extracted. Trees in the other (W5) were also manually felled but extracted with crawler tractors. The slash was burnt in W5 before planting which is the normal practice in this area. During the 10-year rotation period of the plantations 95 Mg of organic carbon ha-1 were lost from the soil in both W4 and W5 corresponding to about 80 of the soil carbon at planting. About 1390 and 1190 kg N ha-1 were lost from the soil in W4 and W5 during this period corresponding to 26 and 22 respectively of the initial amounts of nitrogen in the soil before planting. The amounts of plant-available P and Mg in W4 and W5 and Ca in W5 increased in the soil in spite of the high amounts of nutrients taken up by plants. The content of plant-available K declined probably due to leaching.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v21n2/98...

Abstract

The amounts of organic C and N P K Ca and Mg in the biomass and soils were investigated in two catchments in Sabah Malaysia that had formerly supported a dipterocarp rainforest before it was clear felled and planted with Acacia mangium. Trees in one catchment (W4) were manually felled and extracted. Trees in the other (W5) were also manually felled but extracted with crawler tractors. The slash was burnt in W5 before planting which is the normal practice in this area. During the 10-year rotation period of the plantations 95 Mg of organic carbon ha-1 were lost from the soil in both W4 and W5 corresponding to about 80 of the soil carbon at planting. About 1390 and 1190 kg N ha-1 were lost from the soil in W4 and W5 during this period corresponding to 26 and 22 respectively of the initial amounts of nitrogen in the soil before planting. The amounts of plant-available P and Mg in W4 and W5 and Ca in W5 increased in the soil in spite of the high amounts of nutrients taken up by plants. The content of plant-available K declined probably due to leaching.

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Item Type:	Article
AGROVOC Term:	Nutrients
AGROVOC Term:	Rain forests
AGROVOC Term:	Planting
AGROVOC Term:	Acacia mangium
AGROVOC Term:	Biomass
AGROVOC Term:	Dipterocarps
AGROVOC Term:	Carbon
AGROVOC Term:	Nitrogen
AGROVOC Term:	Mineral soils
AGROVOC Term:	Humus
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 15:20
URI:	http://webagris.upm.edu.my/id/eprint/21675

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