Distribution of Pedogenic Carbonate and Relationship with Soil Organic Carbon in Yanqi Basin

Abstract

Studying of pedogenic carbonate (PIC) has been lacking despite its importance in carbon sequestration. Using isotopic approach, vertical distribution of PIC over 0-100 cm is assessed for agricultural and native lands. In general, PIC stock is significantly higher in the agricultural land than in the native lands. There is a strong correlation (P < 0.001) between PIC stock and SOC stock, implying that an increase of 1 kg C m(-2) in SOC stock may lead to an increase of 1.9 kg C m(-2) in PIC formation. Conversion of native lands to agricultural land has led to an increase in both organic carbon and PIC in soil profiles of Yanqi Basin. NR - 32 PU - SPRINGER-VERLAG BERLIN PI - BERLIN PA - HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY