Measuring carbon stock in peat soils - Balai Penelitian Tanah

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Practical guidelines Measuring carbon stock in peat soils 3.3. Measurement of bulk density and organic matter content For the determination of carbon stocks in peat soil the data of BD, C org , the thickness of the peat and area of the landscape or dome are required. 3.3.1. Bulk density Peat BD is determined in the laboratory by a gravimetric method. Samples to be used for BD analysis can be taken using a peat auger (for example, Ejkelkamp model), a soil core or hollow metal box, each with associated sample volume. The method of soil sampling is as described above. Determination of BD 1. Transfer each sample obtained with peat auger or ring quantitatively into an aluminium cup. If using a soil core, each sample can either be removed from the core or the core with sample inside can be placed in an aluminium can for oven drying. 2. If the data of soil moisture content is required, then weigh the wet soil inside the cup. The mass of wet soil (M ) is M + M , where Ms is the mass t w s of the dry soil and Mw is the mass of water contained in the soil matrix (Figure 13). 3. Dry the soil samples in an oven at 105 oC for 2 x 24 hours or until the constant weight is achieved. If the sample is very wet, it may take 4–5 x 24 hours to reach the constant weight. The constant weight is obtained when the sample weight does not decrease after subsequent drying. For example, if the weight of sample that is dried for 2 x 24 hours is still higher than the sample that was dried for 3 x 24 hours, then the drying should be continued. 4. Put the dry soil within the aluminium can in a desiccator for about 10 minutes. 5. Weigh the dry weight of the soil (M s ) plus the can weight (M c ). 6. Save the soil samples for analysis of organic materials with the LOI method. If the carbon content is to be determined by CN analyzer or Walkley and Black method, the oven-dried soil samples cannot be used, instead air dried samples must be used. 29
30 Agus et al. (2011) Determine the volume of soil samples, V t . If soil samples are taken with the soil ring, then V t = πr 2 t, where r is the inside radius and t is the height of the ring. If the samples are from an Eijkelkamp peat auger with a thickness (sample length) of 50 cm, then V t = 0.5 dm 3 = 500 cm 3 . If a 20 cm-long peat sample was taken from the peat auger, then V t = 200 cm 3 . Calculate BD as DB V t = V s + V w + V a Figure 13. Illustration of peat soil volume Peat soil volume consists of the volume of soil solids (V s ), liquid (V w ) and gas (V a ) and the mass of soil solids (M s ), water (M w ) and air (M a ). The mass of soil solids, M s , is the sum of the mass of organic matter, M om , and ash M ash [1]
Page 1 and 2: Practical guidelines Measuring carb
Page 3 and 4: Citation Agus F, Hairiah K, Mulyani
Page 6 and 7: Figures Figure 1. Schematic process
Page 8: Tables Table 1. Some differences in
Page 11 and 12: x eruptions. It is captured from th
Page 13 and 14: xii Soil bulk density (BD). Dry wei
Page 15 and 16: xiv the largest area of tropical pe
Page 18 and 19: Background Soil is one of the three
Page 24: The exposure of woody roots abovegr
Page 27 and 28: 10 Agus et al. (2011) BD values of
Page 30: Peat soils differ in properties fro
Page 33 and 34: 16 Agus et al. (2011) for mapping m
Page 35 and 36: 18 Agus et al. (2011) 1-2 m 2-3 m 2
Page 37 and 38: 20 Agus et al. (2011) 3.2.2. Peat s
Page 39 and 40: 22 Agus et al. (2011) 3.2.3. Proced
Page 41 and 42: 24 Agus et al. (2011) 8) Store the
Page 43 and 44: 26 Agus et al. (2011) 3.2.4. Undist
Page 45: 28 Agus et al. (2011) Note: The mai
Page 49 and 50: 32 Agus et al. (2011) the conversio
Page 51 and 52: 34 Agus et al. (2011) Calculate org
Page 53 and 54: 36 Agus et al. (2011) Table 3. Exam
Page 55 and 56: 38 Agus et al. (2011) Figure 16. De
Page 58: Burning is often still used in land
Page 61 and 62: 44 Agus et al. (2011) Therefore, th
Page 63 and 64: 46 Agus et al. (2011) Analyzer (IRG
Page 65 and 66: 48 Agus et al. (2011) increase of C
Page 67 and 68: 50 Agus et al. (2011) S = Sequestra
Page 70: Drainage canals are used not only t
Page 73 and 74: 56 Agus et al. (2011) Hairiah K, Ra
Page 75 and 76: 58 Agus et al. (2011) Van de Meene
Page 77 and 78: 60 Agus et al. (2011) 12 Sample cod

Measuring carbon stock in peat soils - Balai Penelitian Tanah

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