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| DOI：10.13522/j.cnki.ggps.2017.0014 |
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| Change in Hydraulic Properties of Soils Amended with Biochar Following Plough of Straw Stalk into Deep Soil Horizon |
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YU Bo, YU Xiaofang, GAO Julin, HU Shuping, SUN Jiying, WANG Zhigang, XIE Min, ZHU Wenxin
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Inner Mongolia Agricultural University, Hohhot 010019, China
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| Abstract: |
| 【Objective】 Soil hydraulic properties are affected by many biotic and abiotic processes and this paper is to investigate experimentally the changes in infiltration rate and water-holding capacity of soils amended with biochar after ploughing maize stalk into deep soil horizons. 【Method】We measured water infiltration in the soils in a corn field for four years after stalk of the maize was ploughed into subsoil via a deep tillage after the harvest; the control was no straw. We also examined the impact of biochar amendment on a loam soil and a sandy soil with biochar-soil ratio at 0, 1%, 3%, 5%, 8%, 10%. The average water infiltration rate and accumulated infiltration in the soils were measured using single-ring infiltration method, and water retention curves of the soils were measured using pressure-membrane method. 【Result】 ①Compared with the CK, at the same matric potential, four years after the tillage increased the water-retention capacity by 21.05%, average infiltration rate by 82.07% and cumulative infiltration by 225.09 cm. ②As time elapsed after the tillage, the water-holding capacity of the soils started to decline while the average infiltration rate increased. 3) Water-holding capacity and the infiltration rate of the sandy soil decreased with increasing biochar application, while in the loam soil applying biochar at ratio of 1% to 8% increased the infiltration rate but reduced water-holding capacity; increasing the biochar application further to 10% only slightly improved the water-holding capacity. 【Conclusion】 Ploughing the maize stalks into subsoil horizon by deep tillage increased soil organic matters and microbial decomposition, thereby improving the ability of the 0~40 cm soil to hold and conduct water. The four-year experiment revealed that such treatments increase yield of the spring maize due to the improved soil quality. |
| Key words: spring maize; deep tillage; straw returning; soil water retention property; cumulative infiltration; water characteristic curve |
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