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Impact of Eight‐Year Topsoil Removal and Soil Amendments on Soil Carbon Dioxide Emission in an Eroded Chinese Mollisols
Author(s) -
Miao Shujie,
Zhou Keqin,
Sui Yueyu,
Zhang Xingyi,
Liu Xiaobing
Publication year - 2015
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/agronj14.0515
Subject(s) - topsoil , environmental science , soil carbon , agronomy , manure , fertilizer , mollisol , total organic carbon , chemistry , environmental chemistry , soil water , soil science , biology
Soil erosion is a serious environmental issue. Information in the severity of soil erosion on CO 2 emission is limited. A soil erosion simulation experiment was used to examine the influence of topsoil removal and cattle manure amendment on soil CO 2 emission for a cultivated Mollisols in Northeast China. Soil CO 2 flux was determined during corn ( Zea mays L.) growing season. Our results showed that after 8‐yr treatment, topsoil removal decreased CO 2 emission in the order of 30 cm < 10 cm < 5 cm < 20 cm < 0 cm under chemical fertilizer treatment alone and 20 cm < 10 cm < 30 cm < 5 cm < 0 cm for cattle manure addition. At the same erosion depth, cattle manure addition increased soil CO 2 emission compared to chemical fertilizer alone treatment. During growing season, the CO 2 flux pattern changed from one peak in chemical fertilizer alone treatment to two peaks in cattle manure addition treatments. In the chemical fertilizer alone system, only microbial biomass carbon (MBC) and dissolved organic carbon (DOC) fractions were significantly correlated with total CO 2 emission. However, cattle manure addition changed the relationship between soil C fraction and CO 2 emission. The MBC, particulate organic carbon (POC), and light fraction organic carbon (LOC) were significantly positively correlated with total CO 2 emission. Though on‐site CO 2 emission was significantly reduced after the soil was severely eroded, restoration of eroded soil productivity by cattle manure amendments might release more CO 2 emission into the atmosphere. Adoption of cattle manure application to eroded Mollisols needs considering the potential negative impact of more CO 2 emission.