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| DOI：10.13522/j.cnki.ggps.2017.0408 |
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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 |
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