不同施氮水平对金菠萝苗期生长及养分吸收的影响  

Effects of Different Levels of Nitrogen Application on the Growth and Nutrient Uptake of Pineapple Variety‘MD-2’at Early Growth Stage

作　　者：韩忠钰 金鑫[1] 邓燕 赵艳[1] 吕烈武[3] 黄顺坚 李长江 HAN Zhongyu;JIN Xin;DENG Yan;ZHAO Yan;LYU Liewu;HUANG Shunjian;LI Changjiang(College of Tropical Crops,Hainan University/Hainan Provincial Key Laboratory of Sustainable Utilization of Tropical Biological Resources,Haikou,Hainan 570228,China;College of Resources and Environment,Southwest University/Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin,Beipei,Chongqing 400715,China;Hainan Provincial Soil and Fertilizer General Station,Haikou,Hainan 570203,China)

机构地区：[1]海南大学热带作物学院/海南省热带生物资源可持续利用重点试验室,海南海口570228 [2]西南大学资源环境学院/长江经济带农业绿色发展研究中心,重庆北碚400715 [3]海南省土壤肥料总站,海南海口570203

出　　处：《热带作物学报》2021年第4期1008-1013,共6页Chinese Journal of Tropical Crops

基　　金：国家自然科学基金项目(No.31860586);2019年海南省基础与应用基础研究计划(自然科学领域)高层次人才项目(No.2019RC108);海南大学科研启动基金项目(No.KYQD(ZR)1850)。

摘　　要：氮素是影响植物生长和养分吸收的重要养分之一,为深入理解菠萝氮素营养生理,本研究以金菠萝为试验对象,通过盆栽试验研究不同施氮水平(0、25、50、100、150、300mg/kg)对金菠萝苗期植株生长、叶绿素和类胡萝卜素含量以及养分吸收的影响。结果表明:随施氮水平增加,金菠萝植株的叶片数、地上部干重、根系干重和总干重都持续增加,在300 mg/kg时生长最好;D叶中叶绿素a、b和类胡萝卜素含量随施氮水平升高呈先升后降的趋势,在100mg/kg时达到最大值;施氮水平增加提高了金菠萝植株N、P、K的吸收;随施氮水平升高,茎、叶中Ca、Mg、Mn、Cu、Zn含量上升,但茎、根中Fe含量下降,除Fe以外的中微量元素吸收量呈增加趋势。因此,本试验条件下,施氮水平增加促进了金菠萝苗期生长与养分吸收。Nitrogen(N)is one of the essential macro nutrients affecting plant growth and nutrient uptake.In this study,the effects of different application levels of N(0,25,50,100,150,300 mg/kg)on plant growth,chlorophyll and carotenoid content,and nutrient uptake of pineapple variety’MD-2’at early growth stage were investigated in a pot experiment.The leaf number,above-ground dry weight,root dry weight and total dry weight of the’MD-2’pineapple plant continued to increase with the increase of N application level,and the growth was the best at 300 mg/kg.The content of chlorophyll a,b and carotenoid in D-leaf firstly increased and then decreased in response to increased N application level,reaching the maximum value at 100 mg/kg.Plant N,P and K uptake generally increased as the N application level went up.The content of Ca,Mg,Mn,Cu,and Zn increased in stem and leaves with increased N application,but the Fe content reduced,and as a result the total uptake of investigated intermediate nutrients and micronutrients except Fe increased.To sum up,under the condition of this experiment,the increase of N application level promoted the growth and uptake of most nutrients of’MD-2’pineapple.

关 键 词：金菠萝 氮素 叶绿素 养分吸收 

分 类 号：S668.3[农业科学—果树学]