摘要
【目的】研究不同溶解氧含量的增氧水对壤土土壤矿化作用和硝化作用的影响,分析增氧水输入提高土壤的供氮能力的作用机制。【方法】以壤土为供试土壤,采用室内土壤培养方法,选取常规水(RCK)、自然空气供氧曝气增氧(RD_(1))、33%增氧供氧曝气增氧(RD_(2))和90%增氧供氧曝气增氧(RD_(3))4个不同浓度增氧水输入,测定不同培养时间下不同浓度增氧水输入下壤土土壤的NH_(4)^(+)-N和NO_(3)^(-)-N含量,计算土壤净氮矿化量、净氮矿化速率、硝化率和硝化速率以及拟合各处理条件下土壤NH_(4)^(+)-N含量与培养时间t的回归公式以及模型特征值,分析不同处理的输入效果。【结果】与达到最大消耗速率所用时间的变化趋势相反,4个不同处理中初始消耗速率V 0和最大消耗速率V _(max)的趋势变化均为RCK<RD_(1)<RD_(2)<RD_(3),初始消耗速率V 0的最大值(8.9501 mg/(kg·d)),最大消耗速率V _(max)的最大值(13.0198 mg/(kg·d))和达到最大消耗速率所用时间T V _(max)的最小值(1.5021 d)均是RD_(3)处理;相同增氧浓度条件下,壤土土壤净氮矿化量和硝化率随时间的增加呈现上升趋势,而壤土土壤净氮矿化速率和净硝化速率随时间的增加呈现下降趋势;在同一培养时间时期下,壤土土壤净氮矿化量、净氮矿化速率、硝化率以及净硝化速率的变化趋势均呈RCK<RD_(1)<RD_(2)<RD_(3)处理的关系。【结论】增加输入水氧浓度会加速壤土氮素转化,增强土壤的矿化作用和硝化作用,改善土壤微生物的活动及矿物质的转化,提高土壤的供氮能力。
【Objective】The effects of oxygenated water with different dissolved oxygen contents on mineralization and nitrification of irrigated loam soil were studied to provide reference for exploring the response of oxygenated water input to soil fertility.【Methods】With loam as the test soil,the contents of NH_(4)^(+)-N and NO_(3)^(-)-N in loam soil under different concentrations of oxygenated water input at different cultivation time were determined by using indoor soil culture test method,including conventional water(RCK),natural air oxygenated aeration(RD_(1)),33%oxygenated aeration(RD_(2))and 90%oxygenated aeration(RD_(3)).The soil net nitrogen mineralization,net nitrogen mineralization rate,nitrification rate and nitrification rate were calculated,and the regression formula and model eigenvalue of soil NH_(4)^(+)-N content and incubation time t under different treatment conditions were fitted,and then the input effects of different treatments were analyzed.【Results】Contrary to the change trend of the time used to reach the _(max)imum consumption rate,the trend changes of the initial consumption rate V 0 and the _(max)imum consumption rate V _(max) in the four different treatments were all RCK<RD_(1)<RD_(2)<RD_(3).The _(max)imum value of the initial consumption rate V 0(8.9501 mg/(kg·d)),the _(max)imum value of the _(max)imum consumption rate V _(max)(13.0198 mg/(kg·d))and the minimum value of the time used to reach the _(max)imum consumption rate T V_(max)(1.5021 d)were all RD_(3) treatments.Under the same oxygen concentration,soil net nitrogen mineralization and nitrification rate increased with time,while soil net nitrogen mineralization rate and nitrification rate decreased with time.At the same incubation period,the variation trends of soil net nitrogen mineralization,net nitrogen mineralization rate,nitrification rate and net nitrification rate were all in the relationship of RCK<RD_(1)<RD_(2)<RD_(3).【Conclusion】Increasing the oxygen concentration of input water can enhance soil mineralization
作者
王红燕
付彦博
王治国
扁青永
冯耀祖
饶晓娟
WANG Hongyan;FU Yanbo;WANG Zhiguo;BIAN Qingyong;FENG Yaozu;RAO Xiaojuan(College of Resources and Enviroment,Xinjiang Agricultural University,Xinjiang Shayibake Urumqi 830052,China;Institute of Soil Fertilizer and Agricultural Water Conservation,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China;Center for Transformation of Scientific and Technological Achievements of Xinjiang Academy of Agricultural Sciences,Urumqi,830091,China;Baicheng Agricultural Experimental Station of Xinjiang Academy of Agricultural Sciences/National Soil Quality Aksu Observation Experimental Station,Xinjiang Aksu 843000,China;Xinjiang Agricultural Vocational and Technical College,Changji,Xinjiang 831100,China)
出处
《新疆农业科学》
CAS
CSCD
北大核心
2022年第11期2601-2613,共13页
Xinjiang Agricultural Sciences
基金
国家自然科学基金(41867018)
新疆农业科学院青年科技骨干创新能力培养项目(xjnkq-2020016)
2018年度新疆农业职业技术学院课题(XJNZYKJ201809)。
关键词
增氧输入
硝化
矿化
壤土
oxygen input
nitrification
mineralization
loam
