氮磷营养对旱冬瓜幼苗生长的影响  

Alnus nepalensis seedling growth with N and P treatments

作　　者：付玉嫔[1] 徐亮[1] 白尚斌[2] 孟广涛[1] 祁荣频[1] 

机构地区：[1]云南林业科学院,云南昆明650204 [2]浙江林学院天目学院,浙江临安311300

出　　处：《浙江林学院学报》2008年第5期553-558,共6页Journal of Zhejiang Forestry College

基　　金：国家林业局重点实验室开放基金资助项目(2002-12);“十一五”国家科技支撑计划项目(2006BAD03A10-03)

摘　　要：采用温室盆栽试验,以Hoagland营养液为母液,其中氮(全氮)和磷(全磷)质量浓度分别为210和62 mg.L-1,通过调节营养液中氮和磷的质量浓度,设置了9种氮和磷配比营养液,对旱冬瓜Alnus nepalensis幼苗进行砂培养试验,从而探讨氮和磷营养对旱冬瓜幼苗的苗高、地径生长和生物量的变化及幼苗吸收氮和磷的影响。结果表明:①不同氮磷营养供应水平对旱冬瓜幼苗的生物量累积、地径和苗高生长量有影响,其中氮的影响达显著水平,磷的影响达极显著水平,氮和磷之间的交互作用不明显。在氮和磷营养配合处理时,只要二者之一的供应水平低于母液中的质量浓度,旱冬瓜幼苗的地上部分生长和根系生长都不如对照。②氮营养水平低于210 mg.L-1时,增加营养液中磷的质量浓度,细根/叶生物量比和地下/地上生物量比降低;氮营养水平等于210 mg.L-1时,增加营养液中磷的质量浓度,这2种生物量比增加;磷营养水平低于62 mg.L-1时,低于或高于210 mg.L-1的氮营养水平导致2种生物量比增大。③在50和210mg.L-1氮营养水平下,增加供磷质量浓度,根和茎中的氮质量分数逐渐降低,当磷水平增到62 mg.L-1时下降为最低,继续增加磷水平,则开始上升;在50 mg.L-1氮水平下,增加供磷水平,叶中的氮质量分数逐渐上升,磷供应达到62mg.L-1时最有利叶片中氮的积累;在210 mg.L-1氮水平下,同样为磷在62 mg.L-1水平时最有利于叶片中氮的积累;不论在何种供氮水平下,在供给32 mg.L-1磷水平时,不利于幼苗对磷的吸收,根、茎、叶中的磷质量分数都最低。Nitrogen （N） and phosphorus （P） are important nutrients for tree growth. There is low N and P content of mountain soil in Yunan Province. They maybe affect Alnus nepalensis seedling growth. This aim was to study Alnus nepalensis seedling growth with different N and P supply. Sand culture greenhouse experiments were used to determine the growth response of Alnus nepalensis to three N treatments （50, 210, and 420 mg·L^-1） and four P treatments （14, 32, 62, and 124 mg·L^-1）, of which the control treatment design was 210 mg·L^-1 N and 62 mg·L^-1 P. Split-plot design with 9 treatments and 5 replications was used in the experiment. Results showed： （1） There had significant changes in root biomass, shoot biomass, leaf biomass, height and diameter increments of seedlings with different N and P supply, but no interaction between N and P, of which the effect of N was remarkable （P 〈 0.05）, and P was extreme remarkable （P 〈 0.01 ）. However, when N or P supply was less than the control, seedling growth reduced. （2） With increasing P and with N lower than 210 mg·L^-1, the fine root mass/leaf mass ratio and root mass/ shoot mass ratio was reduced, whereas with N of 210 mg·L^-1 these two ratios increased. （3） Compared to the control, with N of 50 and 210 mg·L^-1 as P increased, N content of roots and shoots decreased, but leaf N increased. （4） For all N treatments, P concentration in roots, shoots, and leaves was lowest with P 32 mg·L^-1 In conclusion, there was an important effect of Alnus nepalensis seedling growth with balanced N and P supply or with increased P from a Hoagland solution. [Ch, 4 fig. 3 tab. 9 ref.]

关 键 词：植物学 氮磷营养 旱冬瓜 生物量 

分 类 号：S718.3[农业科学—林学] Q948.113[生物学—植物学]