Study on Impacts of Soil Moisture Condition on Paddy Soil Environment under Water-saving Irigation
Study on Impacts of Soil Moisture Condition on Paddy Soil Environment under Water-saving Irigation
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发表时间：
2008
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通讯作者：
Xu Junzeng
中科院分区：
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作者：
Xu Junzeng
根据田间试验资料，分析了控制灌溉条件下稻田土壤温度、土壤氧化还原电位、土壤有机质和氨态氮含量的变化规律及其对水稻生长和稻田环境的影响。结果表明，气温变化对控制灌溉条件下水田土壤温度的影响比平灌条件下更显著。昼夜温差大是控制灌溉条件下水田土壤的特点之一。控制土壤水分显著提高了稻田土壤的Eh，控制灌溉稻田5 cm和20 cm土层的Eh显著高于冲洗灌溉(p0.01)，10 cm土层的Eh差异不显著。Eh的增加减少了稻田有毒还原物质的含量，增强了水稻根系活力。在控制灌溉条件下，增加土壤通气量和土壤温度，可增强硝化细菌活性，强化土壤硝化作用，从而改变土壤氮素形态，降低土壤氨氮含量。
Based on the field experiment data,the change rules of soil temperature,soil redox potential,soil organic matter and ammonium nitrogen content of paddy field under controlled irrigation and their impact on rice growth and paddy field environment are analyzed in this paper.The results show that the influence of air temperature change on the soil temperature of paddy fields under controlled irrigation is more significant than under flush irrigation.Great temperature difference between day and night is one characteristic of paddy soil under controlled irrigation,which is in favor of improving the quality of paddy eco-environment and rice yield.The control of soil moisture significantly enhances the Eh of paddy soil.Eh in 5 cm and 20 cm layers of paddy field under controlled irrigation are significantly higher than that under flush irrigation(p0.01),the difference of Eh in 10 cm layers is not significant.The increase of Eh decreases the content of poisonous reductive substance of paddy field,enhances the activity of rice roots.The control of soil moisture also significantly accelerates the decomposition of organic matter in soil,and then increases the content of effective nutrients in soil.The increase of the content of effective nutrients is beneficial to the rice growth and development.The increase of soil aeration and soil temperature under controlled irrigation enhance the activity of nitrobacteria,intensify the soil nitration,then change the form of soil nitrogen and reduce soil ammonium nitrogen content.