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| Effects of adding corn straw on heavy fraction organic matter and organic-mineral complex of chernozem |
| Received:February 19, 2017 |
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| KeyWord:loess parent material;laterite parent material;chernozem;heavy fraction organic matter(HFOM);organic-mineral complex |
| Author Name | Affiliation | E-mail | | GAO Xue-ying | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | | | SUN Yuan-hong | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | | | ZHAO Xing-min | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | | | SUI Biao | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | | | WANG Hong-bin | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | | | ZHAO Lan-po | College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases, Changchun 130118, China | zhaolanpo12@163.com |
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| Abstract: |
| Based on information from a previous field investigation, soil samples from loess parent material, laterite parent material, and their corresponding developed topsoils of chernozem were collected. It is important to evaluate soil carbon sequestration and potential scientifically by studying the changes in the heavy fraction organic matter(HFOM) and organic-mineral complex after organic materials are added. Considering the scientific problems that need to be clarified for the technology of returning straw to chernozem in the main maize producing areas of Northeast China, the changes in the HFOM and organic-mineral complex were studied by adding different proportions of corn straw to the parent materials and their corresponding developed topsoils of chernozem in a crop growing period through laboratory incubation experimentation. The results showed that the HFOM increment, compound quantity(QC), and additional compound quantity(QAC) in parent materials and their corresponding developed topsoils increased with an increase in the amount of straw added, but compound degree(DC) and additional compound degree(DAC) showed a decreasing trend.For the topsoil, the increment of HFOM and the QC growth rate decreased with increasing organic carbon content, which indicates that soil with low organic carbon content has higher carbon sequestration potential. Although the effect of organic carbon content on QAC had no obvious regularity, the QAC of the two kinds of soil parent materials with very low organic carbon content were higher than that of their corresponding developed topsoils. At the same time, the increment of HFOM and the increase rate of QC in the parent material were much greater than that of their corresponding developed topsoils, and those of the laterite parent material were higher than those of the loess parent material. This indicated the carbon sequestration potential of the parent material was much higher than that of their corresponding developed topsoils, and the carbon sequestration potential of the laterite parent material was greater than that of the loess parent material. |
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