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光照和氮交互作用对水曲柳幼苗生长、生物量和氮分配的影响

霍常富1,2;王政权1;孙海龙1;范志强1;赵晓敏1   

  1. 1东北林业大学林学院, 哈尔滨 150040; 2中国科学院成都山地灾害与环境研究所, 成都 610041
  • 收稿日期:2007-11-26 修回日期:1900-01-01 出版日期:2008-08-20 发布日期:2008-08-20

Interactive effects of light intensity and nitrogen supply on Fraxinus mandshurica seedlings growth, biomass, and nitrogen allocation.

HUO Chang-fu1,2;WANG Zheng-quan1;SUN Hai-long1;FAN Zhi-qiang1;ZHAO Xiao-min1   

  1. 1School of Forestry, Northeast Forestry University, Harbin 150040, Chin
    a; 2Institute of Mountain Hazards and Environment, Chinese Academy of Scie
    nces, Chengdu 610041, China
  • Received:2007-11-26 Revised:1900-01-01 Online:2008-08-20 Published:2008-08-20

摘要: 采用温室沙培方式,对水曲柳幼苗进行了不同光强(2个水平)和氮浓度(4个水平)处理,分析了其生长、生物量和氮分配对环境变化的响应.结果表明:与全光照处理相比,低光处理下水曲柳幼苗冠根比(S/R)和净氮吸收速率(NNUR)极显著提高(P<0.01),但相对生长速率(RGR)和净同化速率(NAR)极显著下降(P<0.01);低光处理下的幼苗根、茎、叶和整株生物量分别较全光照处理降低了36.8%(P<0.01)、1.7%、12.7%(P<0.05)和24.3%(P<0.01);低光处理使幼苗分配到根系的氮比例明显下降,而叶片的分配比例增加.无论光强大小,氮对幼苗生长都具有十分明显的促进作用,而且幼苗S/R和叶片的氮分配比例都随氮供给浓度的增加而明显提高.光强和氮浓度对水曲柳幼苗的基径、S/R、RGR和生物量(根和叶)分配比例具有显著的交互作用(P<0.05).

关键词: 紫色土, 黄壤, 油麦菜, 猪粪, 硝酸盐, 产量, 养分

Abstract: With sand culture in greenhouse, the responses of Fraxinus mandshurica seedlings growth, biomass, and N allocation to 2 levels of light intensity and 4 levels of N supply were studied. The results showed that under low light intensity, the seedlings shoot/root ratio (S/R) and net N uptake rate (NNUR) increased significantly (P<0.01), but their relative growth rate (RGR) and net assimilation rate (NAR) had a significant decrease (P<0.01). The biomass of root, stem, leaf, and total plant under low light was decreased by 36.8% (P<0.01), 1.7%, 12.7% (P<0.05), and 24.3% (P<0.01), respectively, and the N allocation to leaf increased but that to root was in adverse. At the two light levels, N supply had an obvious promotion effect on the seedlings growth, and the S/R and the N allocation to leaf were increased obviously with increasing N supply. Significant interactive effects of light and N supply were observed on the seedlings diameter, S/R, RGR, and biomass allocation.

Key words: purple soil, yellow soil, lettuce, pig manure, nitrate, yield, nutrient.