单 位：
中国农业科学院河南新乡农业水土环境野外科学观测试验站农业水资源高效安全利用重点开放实验室;中国农业科学院农田灌溉研究所;中国农业科学院研究生院
关键词：
微咸水;再生水;混灌;斥水性;IBRv2
摘 要：
为了探讨淡水资源不足地区微咸水的合理利用方式。通过盆栽试验,以清水灌溉为对照,研究不同比例微咸水与再生水混合灌溉对水盐、水溶性离子、滴水穿透时间WDPT、有机质以及酶活性的影响,并利用第二代生物综合响应指数法(IBRv2)对微咸水与再生水混灌效应进行评价。结果表明:(1)与再生水灌溉(T1)相比,随着混合溶液中微咸水比重的升高,土壤含水率和含盐量逐渐升高且差异显著(P<0.05)。(2)与T1处理相比,随着混合溶液中微咸水比重的升高,土壤K~+、Ca~(2+)含量呈降低趋势,Na~+、Cl~-含量显著升高,SO_4~(2-)含量显著降低,Mg~(2+)含量无明显变化规律。(3)与CK2(清水灌溉)相比,T1处理土壤WDPT和有机质含量差异不显著;与T1处理相比,随着混合液中微咸水比重的进一步提高,土壤WDPT和有机质含量总体上呈升高趋势。(4)不同比例微咸水—再生水混合灌溉对土壤酶活性的影响不同。土壤蔗糖酶活性以T2处理(微咸水—再生水1∶2灌溉)最高,土壤脲酶以T3处理(微咸水—再生水1∶1灌溉)最高但和其他处理差异不显著。(5)基于IBRv2指数法,T2处理IBRv2最小,为6.89。因此,综合考虑土壤环境质量指标,在淡水资源匮乏地区利用微咸水(5 g/L)灌溉时,可以考虑用再生替代清水与微咸水配合使用,微咸水—再生水混灌比例以1∶2为宜。
译 名：
Effect of Mixed Irrigation of Brackish Water and Reclaimed Water on Soil Properties and Irrigation Effect Evaluation
作 者：
LIU Chuncheng;CUI Bingjian;HU Chao;WU Haiqing;GAO Feng;Institute of Farmland and Irrigation,CAAS;Graduate School,CAAS;Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province, Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources,CAAS;
关键词：
brackish water;;reclaimed water;;mixed irrigation;;repellency;;IBRv2
摘 要：
This study was carried out to explore the reasonable utilization of brackish water in areas irrigated with brackish water and freshwater is short. This study set four treatments, including, reclaimed water irrigation(T1), mixed irrigation of 1∶2 with brackish water-reclaimed water(T2), mixed irrigation of 1∶1 with brackish water-reclaimed water(T3) and brackish water irrigation(T4), and took tap water irrigation(CK2), bare land irrigation with tap water(CK1) and bare land irrigation with 1∶1 with brackish water-reclaimed water(CK3) as the control, of which the saline degree of brackish water was 5 g/L. Based on the pot experiments, we measured the data of soil water content, soil salt content, water drop penetration time(WDPT), soil organic matter content, and soil enzyme activities including soil sucrase(S-SC), soil alkaline phosphatase(S-AKP/ALP), soil urease(S-UE), soil polyphenol oxidase(S-PPO), and analyzed the their responses to the mixed irrigation with different ratios of brackish water to reclaimed water. Finally, the index of integrated biological response version 2 was used to evaluate the impact of mixed irrigation on soil. The results indicated that:(1) Compared to T1, soil water content and soil salt content gradually increased significantly with the increase of the proportion of brackish water in the mixed solution on the whole.(2) Compared to T1, soil contents of K~(+ )and Ca~(2+) had slight descending trend, soil contents of Na~+ and Cl~- increased obviously, soil SO_4~(2-) content improved significantly, and soil Mg~(2+) content changed with no obvious trend with the increase of the proportion of brackish water in the mixed solution.(3) There were no significant differences in soil WDPTs and soil organ matter contents between T1 and CK2. Compared to T1, soil WDPTs and organic matter content had the ascending trend with the increase of the proportion of brackish water in the mixed solution.(4) The responses of different soil enzyme activities to different mixed irrigation with brackish water and reclaimed water were different. S-SC activity in T2 was the highest, S-UE activity in T3 was the highest but had no obvious differences from other treatments, and S-PPO activity in T4 was the highest following by T3 and no significant difference between them.(5) The index of IBRv2 in T2 was the lowest, and the value was 6.89. Therefore, considering soil environmental indexes and the limits of reclaimed water, reclaimed water could be used as an alternative source of fresh water in combination with brackish water, and mixed irrigation of 1∶2 with brackish water-reclaimed water is recommended based on the index of IBRv2 in short fresh water resource and areas irrigated with brackish water.
