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| Effect of soil conditioners on the soil chemical properties and organic carbon pool of saline-sodic soil |
| Received:April 18, 2019 |
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| KeyWord:saline-sodic soil;soil conditioner;soil chemical properties;soil organic carbon pool;carbon pool management index |
| Author Name | Affiliation | E-mail | | JI Zheng-yu | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | ZHOU Ji-xiang | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | ZHANG He | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | GUO Kang-li | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | LIU Xiao | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | JIANG Hui-min | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | YANG Jun-cheng | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | | | LI Gui-hua | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | liguihua@caas.cn | | ZHANG Jian-feng | National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, China | zhangjianfeng@caas.cn |
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| Abstract: |
| In order to provide a theoretical basis and technical support for the utilization of soil conditioners on saline-sodic soils, this study focused on the effects of different soil conditioners on soil chemical properties and the soil organic carbon (SOC) pool. A field experiment was conducted on a saline-sodic soil in Hetao Irrigated Area of Inner Mongolia. Four treatments were designed as follows:chemical fertilizer only (CK), CK + organic soil conditioner (M), CK + composite soil conditioner (G), and CK + a combination of organic soil conditioner and composite soil conditioner (M+G). After maize was harvested in 2017, soil samples were collected from depths of between 0 and 20 cm. The water-soluble salt ions content, total salt content (TS), sodium adsorption ratio (SAR), pH, SOC, labile organic carbon (LOC), microbial biomass carbon (MBC), and carbon pool management index (CPMI) were measured and analyzed using related software. The following results were obtained. Application of the conditioners increased Ca2+ concentration by 13.07%~33.33%, and decreased soil Na+, Cl-, and SO42- concentrations by 29.83%~46.19%, 12.06%~33.19%, and 19.90%~34.59%, respectively. Compared with the CK treatment, total salt content, SAR, and pH decreased by 12.67%~26.91%, 33.02%~47.06%, and 2.21%~4.56%, respectively, under conditioner treatments. The combined application of two conditioners (M+G), which had the most pronounced effect, significantly (P<0.05) reduced total salt content, SAR, and pH by 26.91%, 47.06%, and 4.56%, respectively, compared with the CK treatment. Compared with the CK treatment, SOC, LOC, and MBC increased by 18.90%~43.87%, 54.55%~82.33%, and 64.04%~86.85%, respectively, under the conditioner treatments. The M+G treatment had the most significant effect on SOC, LOC, and MBC, in each case reaching a significance level of P<0.05. Furthermore, compared with the CK treatment, soil amended conditioners enhanced the CPMI by 95.44%~135.83%, with the M+G treatment having the most pronounced effect (P<0.05). Correlation analysis revealed that soil LOC, MBC, and CPMI were negatively correlated with TS and SAR, indicating that LOC, MBC, and CPMI are sensitive to changes in the chemical properties of saline-sodic soil. Application of organic and composite soil conditioners was found to be an effective measure, not only with regard to reducing soil total salt content, SAR, and pH but also for increasing SOC, soil organic carbon fractions, and the CPMI. Notably, combining the application of an organic soil conditioner and a composite soil conditioner was found to be the most effective approach under the examined experimental conditions. |
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