Total Carbon and Nitrogen Contents in the Topsoil

Fig. 4 shows the change in total carbon and nitrogen contents of the topsoils (0-5 cm) over the period of the turnip crop at the SA01 and CP sites. Total

Figure 3: Nutrient contents in the surface soil (0-5 cm) at the CP site (°) and at the SA01 site (•). (a) Soluble P (mg P2O5g—*), (b) exchangeable K (mmolCg_1), (c) exchangeable Ca (mmolCg_1), and (d) exchangeable Mg (mmolCg_1). Vertical bars represent 7 one SE of the mean (n — 10). The SA01 site was burned on 16 August 2001. Superscript letters indicate the results of one-way ANOVA; means with the same letters are not significantly different by Scheffe's test at each site (p — 0.05).

Figure 3: Nutrient contents in the surface soil (0-5 cm) at the CP site (°) and at the SA01 site (•). (a) Soluble P (mg P2O5g—*), (b) exchangeable K (mmolCg_1), (c) exchangeable Ca (mmolCg_1), and (d) exchangeable Mg (mmolCg_1). Vertical bars represent 7 one SE of the mean (n — 10). The SA01 site was burned on 16 August 2001. Superscript letters indicate the results of one-way ANOVA; means with the same letters are not significantly different by Scheffe's test at each site (p — 0.05).

carbon and nitrogen contents at the SA01 site increased slightly before burning and more the day after burning but then decreased gradually over the crop period, reaching pre-burn levels in mid-November. Total carbon and nitrogen contents at the CP site increased gradually during the same period.

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