| 摘要: |
| 再生水和养殖废水作为农业替代水源对土壤-植物系统养分和重金属迁移规律影响的研究已有很多，但在同等试验条件下对比二者优劣的研究相对较少。【目的】研究再生水和养殖废水灌溉对土壤-植物系统重金属迁移特征。【方法】利用根箱试验比较了再生水和养殖废水灌溉下土壤-植物系统养分和重金属迁移规律的差异。【结果】养殖废水灌溉处理植物生长状况优于再生水灌溉处理；再生水和养殖废水灌溉都可以增加土壤养分和植株养分，养殖废水灌溉增加幅度更大。与对照相比，土壤全N、全P、全K、全Mg、有效Fe、有效Mn、碱解氮、有效磷、速效钾和有机质量分别增加了4.78%、8.76%、4.33%、7.62%、19.04%、8.99%、3.55%、29.40%、14.14%、21.63%，植株根的N、P、K、Ca、Mg量分别增加了49.83%、23.90%、15.44%、4.09%、8.65%；同时，养殖废水比再生水向土壤和植物体中带入了更多的重金属，尤其是Cu和Zn，其中养殖废水处理植株根和茎Zn量显著增加了102.35%和244.49%；但再生水灌溉相比于养殖废水提高了土壤电导率。【结论】养殖废水灌溉增加土壤养分和植株养分量的幅度大于再生水灌溉，但再生水灌溉会增加土壤发生次生盐渍化的风险，而养殖废水灌溉会增加土壤和植物累积重金属的风险。 |
| 关键词: 再生水； 养殖废水； 植物生长； 养分； 重金属 |
| DOI：10.13522/j.cnki.ggps.2017.0408 |
| 分类号: |
| 基金项目: |
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| Differences of Nutrient and Heavy Metals Migration in Soil-plant System Irrigated by Reclaimed Water and Livestock Wastewater |
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LIU Yuan, CUI Erping, LI Zhongyang, DU Zhenjie, GAO Feng, FAN Xiangyang
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang 453002, China; Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources of CAAS, Xinxiang 453002, China
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| Abstract: |
| The effect of reclaimed water and livestock wastewater as agricultural alternative water source on nutrient and heavy metals migration in soil-plant system has been explored deeply, but the comparative studies in the same experiment conditions are relatively rare. 【Objective】 Explore the migration characteristics of heavy metals in soil-plant system under reclaimed water and livestock wastewater irrigation.【Method】 Rhizobox culture method was employed to investigate the differences of nutrient and heavy metals migration in soil-plant system irrigated by reclaimed water and livestock wastewater. 【Result】 The plant growth condition was better under the livestock wastewater irrigation than that under reclaimed water. Irrigation of these two kinds of water could both increase the nutrient content in soil and plants, and the livestock wastewater behaved better. Compared with CK, total N, total P, total K, total Mg, available Fe, available Mn, available N, available P, available K and organic matter content of soil under the livestock wastewater irrigation increased by 4.78%, 8.76%, 4.33%, 7.62%, 19.04%, 8.99%, 3.55%, 29.40%, 14.14% and 21.63% respectively, and N, P, K, Ca and Mg content of plant roots increased by 49.83%, 23.90%, 15.44%, 4.09% and 8.65%, respectively. What’s more, more heavy metals were transported to the soil and plants irrigated by livestock wastewater, especially Cu and Zn. The Zn content of plant roots and stems of livestock wastewater treatment increased by 102.35% and 244.49% significantly compared with CK. However, compared with livestock wastewater, the reclaimed water irrigation raised the soil electric conductivity. 【Conclusion】 Livestock wastewater irrigation has better improvement of soil and plant nutrient than reclaimed water. However, reclaimed water irrigation cam increase the risk of secondary soil salinization, and livestock wastewater irrigation cam increase the risk of heavy metals accumulation in soil and plants. |
| Key words: reclaimed water; livestock wastewater; plant growth; nutrient; heavy metals |
