Abstract
Indonesia has the largest tropical peatlands in the world covered an area of 14.91 million ha. Peatlands play an important role in global carbon sequestration. This study aimed to: a] map the peatland in Pesisir Selatan, Sumatra Barat calculate the soil carbon stock in the peatlands on various land use and peat thickness and c] identify the relationship of soil characteristics to the soil carbon. We investigated thirty soil samples in Pesisir Selatan. The land-use types on peatland in Pesisir Selatan consisted of forest [GH], shrub [GS], oil palm plantations [GPs], annual cropland[GLp], and bareland [GLp]. The results showed that the total area of peatlands in Pesisir Selatan is 78,998.74 ha, while the total amount of soil carbon stocks is 244 million tonnes, and the sequence follows GPs > GS > GH > GT > GLp. The average value of soil carbon stock is 3,090.89 per ha, the sequence follows GH > GS > GT > GPs > GLp. Hence, the average amount of soil carbon stock based on depth is 8,529 tons for peat depth > 600cm, 4,082 tons for peat depth 300-600 cm, and 525 tons for peat depth 0-300 cm. Differences in average values of soil carbon stock per ha are highly influenced by the differences in peat thickness. The dynamics of total carbon show a higher its content in the subsurface layer rather than in the surface layer. The soil carbon is linearly correlated with water content and it is inversely proportional to bulk density.
Highlights
3.1 Distribution of peatlands Based on our results, the total area of peatlands in Pesisir Selatan is 78,998.74 ha
The difference is caused by several land units [Figure 1, left] that do not have a minimum peat layer of 40 cm and do not fulfill other Histosols soil classification criteria based on Soil Survey Staff 2014 [22]
The area has a thickness of peat layer varying from 40 to 500 cm, BD 0.11-0.32 g.cm-3, Total Carbon 50.3% and fulfills the criteria of the histic epipedon [22]
Summary
Indonesia has the largest peatland in the world with an area of 14.91 million ha [1] or 47% of the total peatland’s area in the world [2]. This land can be found in Sumatra, Kalimantan, and Papua [1,3, 4, 5]. The results of the research indicated that the value of soil carbon stock in different land uses is varied[11, 12]. There is no information about the carbon stock in Pesisir Selatan under several classes of peatland-uses and depths
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