| 再生水水质对斥水和亲水土壤水分特征曲线的影响 |
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| 引用本文： | 陈俊英,柴红阳,Leionid Gillerman,刘畅,蔡耀辉,张林.再生水水质对斥水和亲水土壤水分特征曲线的影响[J].农业工程学报,2018,34(11):121-127. |
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| 作者姓名： | 陈俊英 柴红阳 Leionid Gillerman 刘畅 蔡耀辉 张林 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院旱区农业水土工程教育部重点实验室;本古里安大学Blaustein沙漠研究所;西北农林科技大学水土保持研究所 |
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| 基金项目： | 国家自然科学基金资助项目（51409221、51349001）；西北农林科技大学基本科研业务费（2452017116） |
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| 摘 要： | 为探求再生水灌溉对斥水和亲水土壤水力特性的影响,该文选用有代表性的斥水黏壤土和亲水黏壤土、斥水砂土和亲水砂土,测定其在自来水、再生水和其他4种生活污水条件下的土壤水分特征曲线,采用主成分分析法得到不同水质综合指标,分析水质综合指标对不同土壤水分特征曲线的影响,采用van Genuchten-Mualem模型对黏壤土土-水曲线的参数进行拟合,并分析水质综合指标对黏壤土累积当量孔径分布、比水容量和水分常数的影响。结果表明:在相同基质吸力情况下,黏壤土含水率随水质综合指标增加(水质变差)而减小,砂土的含水率随水质变化不大;在低吸力段,斥水和亲水黏壤土的比水容量随水质综合指标的增加而增加;土壤进气值与水质综合指标呈显著负线性相关关系(R~2分别为0.94和0.78);相同水质条件下,斥水土壤的进气值比亲水土壤小;随着水质综合指标的增加,斥水和亲水黏壤土的极微孔隙降低,而中等孔隙和大孔隙增加,小于某当量孔径的累积百分比增加;随着水质综合指标的增加,斥水和亲水黏壤土的田间持水率、凋萎系数、有效水和易利用水比例均减小,但再生水对田间持水率和易利用水比例降低作用不显著。研究结果可为大面积再生水灌溉及其管理提供一定的理论依据。
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| 关 键 词： | 土壤 水质 再生水 水分特征曲线 斥水 |
| 收稿时间： | 2018/1/19 0:00:00 |
| 修稿时间： | 2018/4/10 0:00:00 |
Impact of treated waste water quality on repellent and wettable soil water characteristic curve |
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| Chen Junying,Chai Hongyang,Leionid Gillerman,Liu Chang,Cai Yaohui and Zhang Lin.Impact of treated waste water quality on repellent and wettable soil water characteristic curve[J].Transactions of the Chinese Society of Agricultural Engineering,2018,34(11):121-127. |
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| Authors: | Chen Junying Chai Hongyang Leionid Gillerman Liu Chang Cai Yaohui and Zhang Lin |
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| Institution: | 1. College of Water Resources and Architectural Engineering, Key Laboratory of Agricultural Soil and Water Engineering in the Ministry of Education, Northwest A&F University, Yangling 712100, China;,1. College of Water Resources and Architectural Engineering, Key Laboratory of Agricultural Soil and Water Engineering in the Ministry of Education, Northwest A&F University, Yangling 712100, China;,2. J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, SedeBoker 84990, Israel;,1. College of Water Resources and Architectural Engineering, Key Laboratory of Agricultural Soil and Water Engineering in the Ministry of Education, Northwest A&F University, Yangling 712100, China;,1. College of Water Resources and Architectural Engineering, Key Laboratory of Agricultural Soil and Water Engineering in the Ministry of Education, Northwest A&F University, Yangling 712100, China; and 3. Institute of Water and Soil Conservation, Northwest A&F University, Yangling 712100, China |
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| Abstract: | Abstract: Treated waste water reuse in agricultural irrigation is an alternative approach for water saving. However it causes soil water repellency and the other problems. The study of reclaimed treated waste water on soil water characteristic curve is a important research basis for the water movement. Only a few researches are related to the key factors. In this study, we aimed to explore the impact of treated waste water quality on soil hydraulic characteristic. The repellent and wettable clay loam were collected at a soil depth of 0-5 cm and 10-20 cm in grapefruit orchard at Kibbutz Berry, Isreal. The repellent and wettable sand were collected at a soil depth of 0-5 cm and 10-20 cm in oranges orchard at Kibbutz Magen, Isreal. The orchards irrigated with treated wasted water about 20 years. The repellency level of clay loam and sand were moderated and severed respectively. Treated waste water and tap water were obtained in a domestic sewage treatment plant. The water sampling locations were catchment, anaerobic pool, oxidation pool, sedimentation pool and outlet of reused water. Each treatment had 4 replicates. The soil moisture characteristic curves were measured with a high-speed centrifuge. The experiment was conducted in the Key Laboratory of Agricultural Soil and Water Engineering, Ministry of Education, at Northwest A&F University on August 2017. The van Genuchten-Mualem model was fitted to obtain the hydraulic parameters with RETC software. The comprehensive water quality index was obtained by principal component analysis. The impact of comprehensive water quality indicators on soil water characteristic curve, the cumulative pore size distribution, specific water capacity, soil moisture parameters was analyzed in this paper. The result showed with the imporvement of comprehensive water quality indicators, the soil water characteristic curve of the water-repellent and hydrophilic clay loam shifted to the left. Under the same suction condition, the soil moisture of repellent and wettable clay loam decreased with the increase of comprehensive water quality index, while the soil moisture of repellent and wettable sand changed little. There was no significant difference in saturated soil moisture and residual soil moisture between different water quality for repellent and wettable clay loams. The reciprocal of air entry value was significantly different among different water quality for repellent and wettable clay loams. There was a linear negative correlation between comprehensive water quality index and air entry value soil and (R2 was 0.94 and 0.78). The air entry value the repellent soil was less than that of the wettable soil under the same water quality condition. In the low suction stage, the specific water quality curve with higher comprehensive water quality indexes was above the low water quality comprehensive indicator. That is, the high comprehensive water quality index caused the water content to become higher. In the high suction section, the specific water capacity curves of the various water qualities almost coincided. The value was small and closed to 0. With the increase of comprehensive water quality index, the extreme pores in the water repellent and wettable clay loam decreased, the medium and large pores increased. There was no significant difference on micropores and small pores among the water quality. The cumulative percentage less than a certain equivalent pore size increased with the increase in the comprehensive water quality index increase. For water-repellent and wettable clay loams, the field capacity, wilting coefficient, effective water, unavailable water and ratio of easily available water decreased with the comprehensive water quality index increased. But the field capacity and the ratio of easily available water were not significantly decreased to meet the irrigation requirements. The research outcome can provide the theory support for reclaimed water irrigation and management. |
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| Keywords: | soils water quality treated waste water water characteristic curve water repellency |
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