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| DOI：10.13522/j.cnki.ggps.2017.0069 |
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| Investigation of Na+ Dynamic Change in Salinized Farmland Soil under Conditioner Application |
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LIU Jia, PAN Yinghua, ZHANG Qingwen, LIU Lu, ZHANG Zhenhua, GU Xiaoyan, YANG Yongqin
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School of Resources and Environmental Engineering, Ludong University, Yantai 264000, China;Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of AgriculturalSciences, Beijing 100081, China
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| Abstract: |
| 【Objective】 The aim of this work is to improve and make use of saline-alkali soil effectively, to promote crop yield and agricultural sustainable development. 【Method】 Taking farmland soil of Binzhou as the experimental material, four soil treatments were set, and they were Bamboo charcoal organic compound fertilizer, Bacteria organic compound fertilizer, Polyacrylamide application and CK. Spatial distribution of Na+ and its dynamic change were investigated. 【Result】 As time goes by, Na+ migrated to the deeper layer. Na+ in the top soil layers changed greatly, Na+ in other soil layers changed slowly, and Na+ dynamic change trend of different soil layers were nearly the same. The dynamic change of Na+ content could be roughly divided into two phases. Before the elongation stage, the Na+ content vibrated strongly, then the trend tends to be stable and the regularity was obvious. The Na+ content in soil profile increased with soil layer depth. In the horizontal direction, Na+ content was different, and Na+ content of CK was higher. Na+ content of BO and PAM treatments were close to that of CK. The Na+ content of BC treatment was lower. Na+ content of 0～10 cm and 30～40 cm soil layers of BC treatment and Na+ content of 30～40 cm soil layer of CK and Na+ content of 20～30 cm soil layer of PAM treatment were significantly correlated with water-soluble salt. In addition to 40～50 cm layers, Na+ content of BO treatment was significantly correlated with water-soluble salt. Besides the positive relationship between Na+ content and Electrical conductivity (EC) in 0～20 cm soil layer of BC treatment and 0～10 cm and 20～40 cm soil layers of CK and 0～30 cm soil layer of PAM treatment, those relationships of other soil layers were not significant. 【Conclusion】As time goes by, Na+ migrates to the deeper layer. The Na+ content in soil profile increases with soil layer depth. In the horizontal direction, Na+ content is different. In three conditioners, Polyacrylamide is the better one; Bamboo charcoal organic compound fertilizer is the second. |
| Key words: saline soil; Na+ content; soil profile; dynamic change; soil conditioner |
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