| 引用本文: | 莫宇,高峰,王宇, 等..不同施氮条件下再生水灌溉对土壤理化性质及脲酶活性的影响[J].灌溉排水学报,2022,41(1):95-100. |
| MO Yu,GAO Feng,WANG Yu, et al..不同施氮条件下再生水灌溉对土壤理化性质及脲酶活性的影响[J].灌溉排水学报,2022,41(1):95-100. |
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| 摘要: |
| 【目的】探讨不同施氮条件下再生水灌溉对土壤理化性质和脲酶活性的影响。【方法】采用盆栽试验种植上海青，以清水灌溉为对照，上海青出苗后灌水4次，每次1 L，研究了不同施氮条件下（0、120、150、180 mg/L）再生水灌溉对土壤氮素分布和脲酶活性的影响。【结果】与清水灌溉相比，再生水灌溉降低了土壤pH值，对有机质量、全氮量、铵态氮量无显著影响，显著降低了土壤EC值和水溶性Na+量，显著增加土壤硝态氮、水溶性K+量和0~10 cm土层脲酶活性。土壤理化性质与脲酶活性相关性分析表明，0~5 cm土壤脲酶活性与全氮和水溶性Na+呈显著负相关，与水溶性K+显著正相关。【结论】再生水灌溉条件下施120 mg/kg氮素更有利于提升土壤养分水平。 |
| 关键词: 再生水灌溉；理化性质；氮素；脲酶 |
| DOI：10.13522/j.cnki.ggps.2021106 |
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| Changes in Soil Physicochemical Properties and Urease Activity as Affected by Reclaimed Water Irrigation and Nitrogen Fertilization |
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MO Yu, GAO Feng, WANG Yu, et al.
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;
2. Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 4. Henan Xinxiang Hydrological and Water Resources Survey Bureau, Xinxiang 453000, China
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| Abstract: |
| 【Objective】Using treated wastewater as a supplementary water resource for irrigation is one solution to helping relieve the pressure resulting from water shortage in many regions around the world. Since reclaimed wastewater is rich in nutrients and elements that are beneficial and harmful to crops and soil microbial communities, the impact of reclaimed water irrigation on microbial activity and physicochemical properties of soil is likely to vary with other agronomic practices, which remains poorly understood. The purpose of this paper is to address these issues.【Method】The experiments were conducted in pots repacked with soil. The irrigation amount was the same in all pots, and every pot was irrigated four times after emergence and each time irrigated 1 L water, with nitrogen fertilization varying only(0, 120, 150, 180 mg/L). Clean water irrigation was taken as the control. During the experiment, we measured the change in nitrogen distribution and urease activity in each pot.【Result】Compared with the control, reclaimed water irrigation did not show significant effect on soil organic mass (SOM), total nitrogen (TN), ammonium, but reduced soil pH, electrical conductivity (EC) and water-soluble Na+ content. It also increased soil nitrate, water-soluble K+ and urease activity in the 0~10 cm soil layer, all at significant level. Soil physicochemical properties and urease activity in the 0~5 cm soil were negatively correlated with TN and water-soluble Na+, while positively correlated with water-soluble K+, all at significant level.【Conclusion】For all treatments we compared, reclaimed water irrigation coupled with 120 mg/kg of nitrogen fertilization was most beneficial to increasing soil nutrients and urea activity in the soil. |
| Key words: reclaimed water irrigation; physicochemical properties; nitrogen fertilization; urease activity |
