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| DOI：10.13522/j.cnki.ggps.2020003 |
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| The Effect of Smash-ridging Cultivation on Properties of Saline-alkali Soil in Hetao Irrigation District |
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YANG Bo, QU Zhongyi*, SUN Huihui, YANG Wei, WANG Liping, LIU Xia, ZHANG Ruxin, WANG Qiyuan
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School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
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| Abstract: |
| 【Background】Hetao Irrigation District has the largest salt-affected areas in China. The cultivated lands affected by salinization and alkalization in the region are about 394 000 hm2, accounting for 68.65% of its total cultivated lands. Among many factors, tillage plays an important role in genesis of soil salinity. Compared with conventional shallow tillage that disturbs soil and destroys soil structure, non-tillage improves soil capacity to hold water and nutrients. However, long-term non-tillage could densify soil thereby reducing salt leaching and impending seedlings emergence and their subsequent development.【Objective】The purpose of this paper is to experimentally elucidate the impact of smash-ridging cultivation on properties of saline-alkali soil in Hetao Irrigation district.【Method】The experiment was conducted at plots in a field, with standard cultivation used by local farmers as the control. In each treatment, soil samples were taken to measure soil properties including water-stable aggregates, soil organic matter, total soil nitrogen and counts of microbes. The difference between the treatments and the control was statistically analyzed.【Result】①Smash-ridging cultivation reduced total soluble salt content in the 0~40 cm soil by 30.34% in additional to the reduction in pH, compared with the control. ②It was also found that, compared to the control, smash-ridging cultivation increased porosity and three-phase ratio of the soil, especially soil in 20-30 cm, due to the breaking of the dense layer in 20~30 cm. ③The smash ridging cultivation increased soil organic matter, total soil nitrogen and water-stable aggregates, especially aggregates with diameters in 0.25~1.00 mm and 0~40 cm. ④Smash-ridging cultivation increased the counts of microbes in 0~40 cm soil, especially in 20~40 cm, due to the increased porosity which improved habitat for microorganisms and promoted their activities.【Conclusion】Smash-ridging cultivation significantly improved physical, chemical and biological properties of saline-alkali soil in Hetao irrigation district. |
| Key words: Smash-ridging cultivation; soil porosity; organic matter; aggregate stability; soil microorganisms |
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