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Effect of Cultivation on Dynamics of Organic and Inorganic Carbon Stocks in Songnen Plain
Author(s) -
Yu Pujia,
Li Qiang,
Jia Hongtao,
Li Guangdi,
Zheng Wei,
Shen Xiangjin,
Diabate Baba,
Zhou Daowei
Publication year - 2014
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj14.0113
Subject(s) - soil carbon , agronomy , soil water , chronosequence , steppe , total organic carbon , chemistry , soil ph , total inorganic carbon , environmental science , carbon dioxide , zoology , soil science , biology , environmental chemistry , ecology , organic chemistry
The accurate estimation of soil C stock is important for understanding the global C cycles. Particularly in arid regions, quantification of soil inorganic carbon (SIC) is required in addition to the more frequently reported soil organic carbon (SOC). We analyzed SOC, SIC, soil bulk density (BD), electrical conductivity (EC) and pH of alkali–saline soils at a 0‐ to 100‐cm depth in a cultivation chronosequence that consisted of a meadow steppe site and four cropped sites with maize ( Zea mays L.) for 1, 7, 17, and 24 yr in Songnen Plain, Northeast China to quantify SOC and SIC dynamics. Results showed that SOC stock in 0 to 100 cm soil was 92.3, 83.7, 80.9, 78.2, and 76.9 Mg C ha −1 for Steppe, Crop‐1Y, Crop‐7Y, Crop‐17Y, and Crop‐24Y, respectively, decreased at a rate of 3.63 Mg C ha −1 yr −1 . In contrast, SIC stock, ranging from 159.0 to 179.4 Mg C ha −1 increased at a rate of 0.53 Mg C ha −1 yr −1 in 0‐ to 100‐cm depth. The soil total carbon (STC) stock increased at a rate of 0.46 Mg C ha −1 yr −1 following land use conversion, peaked in the seventh year of cultivation and then declined at a rate of 0.89 Mg C ha −1 yr −1 . The SOC concentrations were negatively correlated with BD, EC, and pH, but SIC concentrations were positively correlated with soil BD, EC, and pH. The findings underline the importance of including SIC in the soil C estimates while considering deep soil profile and longer cultivation period.