不同施氮条件下再生水灌溉对土壤理化性质及脲酶活性的影响  

Changes in Soil Physicochemical Properties and Urease Activity as Affected by Reclaimed Water Irrigation and Nitrogen Fertilization

作　　者：莫宇 高峰[1,3] 王宇[4] 马欢欢 张茜[1,2] 胡超 崔丙健 刘春成[1,3] MO Yu;GAO Feng;WANG Yu;MA Huanhuan;ZHANG Qian;HU Chao;CUI Bingjian;LIU Chuncheng(Farmland Irrigation Research Institute,Chinese Academy of Agricultural Sciences,Xinxiang 453002,China;Graduate University of Chinese Academy of Agricultural Sciences,Beijing 100081,China;Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources,Chinese Academy of Agricultural Sciences,Xinxiang 453002,China;Henan Xinxiang Hydrological and Water Resources Survey Bureau,Xinxiang 453000,China)

机构地区：[1]中国农业科学院农田灌溉研究所,河南新乡453002 [2]中国农业科学院研究生院,北京100081 [3]中国农业科学院农业水资源高效安全利用重点开放实验室,河南新乡453002 [4]河南省新乡市水文水资源勘测局,河南新乡453000

出　　处：《灌溉排水学报》2022年第1期95-100,共6页Journal of Irrigation and Drainage

基　　金：国家重点研发计划项目(2017YFC0403503-2);河南省科技攻关项目(202102110264);河南省科技攻关项目(192102110094);河南省自然科学基金青年项目(202300410552);中国农业科学院农业科技创新工程项目(ASTIP202104)。

摘　　要：【目的】探讨不同施氮条件下再生水灌溉对土壤理化性质和脲酶活性的影响。【方法】采用盆栽试验种植上海青,以清水灌溉为对照,上海青出苗后灌水4次,每次1 L,研究了不同施氮条件下(0、120、150、180 mg/L)再生水灌溉对土壤氮素分布和脲酶活性的影响。【结果】与清水灌溉相比,再生水灌溉降低了土壤pH值,对有机质量、全氮量、铵态氮量无显著影响,显著降低了土壤EC值和水溶性Na+量,显著增加土壤硝态氮、水溶性K+量和0~10cm土层脲酶活性。土壤理化性质与脲酶活性相关性分析表明,0~5cm土壤脲酶活性与全氮和水溶性Na+呈显著负相关,与水溶性K+显著正相关。【结论】再生水灌溉条件下施120 mg/kg氮素更有利于提升土壤养分水平。【Objective】Using treated wastewater as a supplementary water resource for irrigation is one solution to helping relieve the pressure resulting from water shortage in many regions around the world.Since reclaimed wastewater is rich in nutrients and elements that are beneficial and harmful to crops and soil microbial communities,the impact of reclaimed water irrigation on microbial activity and physicochemical properties of soil is likely to vary with other agronomic practices,which remains poorly understood.The purpose of this paper is to address these issues.【Method】The experiments were conducted in pots repacked with soil.The irrigation amount was the same in all pots,and every pot was irrigated four times after emergence and each time irrigated 1 L water,with nitrogen fertilization varying only(0,120,150,180 mg/L).Clean water irrigation was taken as the control.During the experiment,we measured the change in nitrogen distribution and urease activity in each pot.【Result】Compared with the control,reclaimed water irrigation did not show significant effect on soil organic mass(SOM),total nitrogen(TN),ammonium,but reduced soil pH,electrical conductivity(EC)and water-soluble Na+content.It also increased soil nitrate,water-soluble K+and urease activity in the 0~10 cm soil layer,all at significant level.Soil physicochemical properties and urease activity in the 0~5 cm soil were negatively correlated with TN and water-soluble Na+,while positively correlated with water-soluble K+,all at significant level.【Conclusion】For all treatments we compared,reclaimed water irrigation coupled with 120 mg/kg of nitrogen fertilization was most beneficial to increasing soil nutrients and urea activity in the soil.

关 键 词：再生水灌溉 理化性质 氮素 脲酶 

分 类 号：A[哲学宗教—马克思主义哲学]