Pool Sizes and Turnover of Soil Organic Carbon of Farmland Soil in Karst Area of Guilin

• Published in: The journal of Northeast Agricultural University Vol. 18; no. 1; pp. 39 - 45
• Main Authors: YANG, Hui, CAO, Jianhua, ZHANG, Liankai, HOU, Yanlin, MAO, Lifeng
• Format: Journal Article
• Language: English
• Published: Elsevier (Singapore) Pte Ltd 01.03.2011; Graduate University of Chinese Academy of Sciences, Beijing 100049, China; Institute of Karst Geology of CAGS, Guilin 541004, Guangxi, China%Institute of Karst Geology of CAGS, Guilin 541004, Guangxi, China%Environmental Management College of Cluna, Qinhuangdao 066004, Hebei, China%Graduate University of Chinese Academy of Sciences, Beijing 100049, China%International Culture College of Capital Normal University, Beijing 100089, China
• Subjects: farmland; karst area; soil organic carbon pool; turnover time; karst area; farmland; soil organic carbon pool; turnover time
• ISSN: 1006-8104
• DOI: 10.1016/S1006-8104(13)60081-1

The three-pool and first-order model separates the mineralizable organic carbon into active,slow,and passive carbon pools.This paper used the model and decomposition curves of the soil organic carbon to fit the active pool and its decomposition rate,slow pool and its decomposition rate.The results showed that the size of the active pool from different profiles accounted for 2.09%-3.08% of the total soil organic carbon and the mean residue time was 3.57-17.21 days.And the size of the slow pool accounted for 3.19%-43.55% and the mean residue time was 1.12-4.94 years.Acid hydrolysis（6M HCl） was used to fractionate the passive organic carbon,which accounted for 50.83%-94.44% of the total soil organic carbon.