供氮水平对水稻抽穗期植株根系形态及养分吸收的影响  

Effect of nitrogen supply levels on root morphology and nutrient absorption of rice plants at heading stage

作　　者：戴含 王小卉 邓莹萍 李绪孟[1] DAI Han;WANG Xiaohui;DENG Yingping;LI Xumeng(College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China)

机构地区：[1]湖南农业大学农学院,湖南长沙410128

出　　处：《排灌机械工程学报》2021年第7期727-732,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：湖南省教育厅科学研究重点项目(18A115);湖南农业大学双一流建设项目(SYL2019001);湖南省自然科学基金青年项目资助项目(2018JJ3227);国家重点研发计划项目(2017YFD0301507)。

摘　　要：为了研究供氮水平(设置了5个不同处理CK,N1,N2,N3和N4,氮质量浓度分别为0,25,50,75和100 mg/L)对抽穗期水稻植株根系形态及养分吸收的影响,以黄华占和晶两优1468两种水稻为研究对象,采用水培方式进行盆栽试验,并探讨了供氮水平对水稻抽穗期植株根系形态及养分吸收的影响.结果表明:处理N2下,黄华占总根长、总根体积和总根表面积分别增加4.62%,189.58%和36.63%;晶两优1468总根长、总根体积和总根表面积分别增加13.84%,55.76%和54.17%.黄华占和晶两优1468根茎叶干质量分别增长71.51%,39.94%,104.04%,以及90.38%,46.53%,67.07%.因而黄华占和晶两优1468的总根长、总根体积和总根表面积以及根茎叶干质量随培养液氮浓度增加均呈先上升后下降的趋势,其变化规律符合二次函数关系,供氮水平为50 mg/L时最适宜黄华占和晶两优1468两种水稻生长.In order to study the effects of different nitrogen supply levels(5 different treatments named CK,N1,N2,N3 and N4 with nitrogen concentration of 0,25,50,75 and 100 mg/L were set)on the root morphology and nutrient absorption of rice plants at heading stage.In this study,Huang Huazhan and Jingliangyou1468 were used as the research objects.The pot experiments were conducted by hydroponics,and the effects of nitrogen supply level on the morphology and nutrient absorption of rice roots at the heading stage were discussed.The results show that the percentage of total root length,total root volume and total root surface area of Huanghua increase by 4.62%,189.58%and 36.63%,respectively,under N2 treatment.The total root length,total root volume and total root surface area of Jingliangyou1468 increase by 13.84%,55.76%and 54.17%,respectively.The dry mass of roots,stems and leaves of Huang Huazhan and Jingliangyou1468 increase by 71.51%,39.94%,104.04%,and 90.38%,46.53%,and 67.07%,respectively.Therefore,the total root length,total root volume and total root surface area of Huang Huazhan and Jingliangyou1468,as well as the dry mass of roots,stems and leaves,all increase first and then decrease with the increase in the concentration of the culture liquid nitrogen.The variation law is in accordance with the quadratic function relationship.When the nitrogen supply level is 50 mg/L,Huang Huazhan and Jingliangyou1468 are the most suitable for rice growth.

关 键 词：水稻 供氮水平 根系形态 抽穗期 水培养分 黄华占 晶两优1468 

分 类 号：S143.1[农业科学—肥料学] S565.1[农业科学—农业基础科学]