![]() ![]() Compared with CK, the contents of SOC, readily oxidizable organic carbon (ROC), particulate organic carbon (POC) and recalcitrant carbon (RC) under the BC treatments in Linquan increased by 7.09–38.08%, 1.62–39.80%, 9.52–62.30% and 8.66–58.14%, respectively. Five BC treatment plots were established, with application rates of 0, 5, 15, 20, and 40 t In this study, we chose karst regions with two different ecological types, Linquan and Heishitou towns in Bijie City, China. In order to address this issue, two field experiments were designed to observe the changes in the SOC and its fractions after two years of BC application. However, the long-term effects of BC application on the soil organic carbon (SOC) and labile organic carbon (LOC) fractions are unclear, especially in karst regions. Biochar (BC) is widely used in soil to increase carbon sequestration.
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