摘要
生活再生水含有大量植物生长所必需的营养元素,是一类城市绿地灌溉的良好水源,对于缓解城市用水紧张具有极高的利用价值。为探讨生活再生水灌溉对常见冷季型草根际土壤养分的影响,采用3种不同类型灌溉水质(分别为清水、再生水和50%清水配50%再生水混合水)对早熟禾草坪草进行了为期1年的灌溉实验。结果表明:①不同水质灌溉会导致土壤中营养元素的空间分布发生变化,全氮、碱解氮、速效钾的含量均随着土壤深度的增加呈现先降低后增加的趋势。②T0、T1、T2处理下,土壤中有机质和NO_(3)^(-)的含量均随着土壤深度的增加呈现先降低后增加的趋势,且在0~10 cm土层处,有机质含量均远高于实验期前(7.8 mg/kg),分别为12.7、13.4、13.5 g/kg;其中,再生水处理0~10 cm土层处NO_(3)^(-)含量达到27 mg/kg,远高于混合水和清水的7 mg/kg。③再生水灌溉下土壤体积含水率最低,且在90 cm土层处土壤体积含水率波动范围最小(0.218~0.268 cm^(3)/cm^(3))。与清水灌溉相比,再生水中的营养物质可被植物根系吸收,促进草坪草生长;但若长期使用再生水灌溉或不控制再生水浓度,水中大量化学物质会影响土壤孔隙度,对土壤造成一定的影响。
Domestic reclaimed water contains a large number of nutrient elements necessary for plant growth,which is a good water source for urban green space irrigation and has a high utilization value for alleviating urban water shortage.In order to reveal the impact of domestic reclaimed water irrigation on the rhizosphere soil nutrients of common cold-season grasses,this study used three types of water quality(i.e.,fresh water,reclaimed water,and mixed water composed of 50%of fresh water and 50%of reclaimed water)for turf grass(Poa pratensis)irrigation in an entire year.The results showed as follows:①Irrigation with different water quality changed the vertical distribution of nutrient elements in the soil,and the total nitrogen,the contents of alkali-hydrolyzable nitrogen and available potassium first decreased and then increased with the increase of soil depth.②Under T0,T1 and T2 treatments,the contents of organic matter and NO3-in the soil decreased first and then increased with the increase of soil depth,and the contents of organic matter in 0~10 cm soil layer were much higher than before(7.8 mg/kg),which were 12.7 g/kg,13.4 g/kg and 13.5 g/kg,respectively.Among them,the NO3-content in 0~10 cm soil layer treated by reclaimed water reached 27 mg/kg,which was much higher than 7 mg/kg of mixed water and clean water.③Under reclaimed water irrigation,the soil volumetric water content was the lowest,and the fluctuation range of soil volumetric water content at 90 cm layer was the lowest(0.218 cm3/cm3 to 0.268 cm3/cm3).Compared with irrigation with clean water,nutrients in reclaimed water could be absorbed by plant roots to promote the growth of turfgrass.However,if the reclaimed water is used for long-term irrigation or the reclaimed water concentration is not controlled,a large number of chemical substances in the water will affect the soil porosity and have a certain impact on the soil.
作者
肖雨霄
邓凌云
裴宏伟
李雅丽
吕圣薇
刘孟竹
胡锦娟
肖捷颖
XIAO Yu-xiao;DENG Ling-yun;PEI Hong-wei;LI Ya-li;LÜSheng-wei;LIU Meng-zhu;HU Jin-juan;XIAO Jie-ying(College of Environmental Sciences and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Zhangjiakou Ecological Environment Monitoring Center of Hebei Province,Zhangjiakou 075000,Hebei Province,China;Department of Municipal and Environmental Engineering,Hebei University of Architecture,Zhangjiakou 075000,Hebei Province,China;Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources,Zhangjiakou 075000,Hebei Province,China)
出处
《节水灌溉》
北大核心
2022年第5期60-64,70,共6页
Water Saving Irrigation
基金
河北省自然科学基金项目(D2020404001)
河北省科技厅大学生科技创新能力培育专项项目(190)。
关键词
不同水质
混合水
生活再生水
中水
城市绿地
草坪灌溉
根区
土壤养分
different water quality
mixed water
domestic reclaimed water
reclaimed water
urban green land
the lawn irrigation
root zone
soil nutrients
