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    王力朋, 李吉跃, 王军辉, 何茜, 苏艳. 指数施肥对楸树无性系幼苗生长和氮素吸收利用效率的影响[J]. 北京林业大学学报, 2012, 34(6): 55-62.
    引用本文: 王力朋, 李吉跃, 王军辉, 何茜, 苏艳. 指数施肥对楸树无性系幼苗生长和氮素吸收利用效率的影响[J]. 北京林业大学学报, 2012, 34(6): 55-62.
    shu
    WANG Li-peng, LI Ji-yue, WANG Jun-hui, HE Qian, SU Yan. Effects of exponential fertilization on seedling growth and nitrogen uptake and utilization efficiency of Catalpa bungei clones[J]. Journal of Beijing Forestry University, 2012, 34(6): 55-62.
    Citation: WANG Li-peng, LI Ji-yue, WANG Jun-hui, HE Qian, SU Yan. Effects of exponential fertilization on seedling growth and nitrogen uptake and utilization efficiency of Catalpa bungei clones[J]. Journal of Beijing Forestry University, 2012, 34(6): 55-62.
    shu

    指数施肥对楸树无性系幼苗生长和氮素吸收利用效率的影响

    Effects of exponential fertilization on seedling growth and nitrogen uptake and utilization efficiency of Catalpa bungei clones

      摘要
    • 摘要: 为探求楸树不同无性系的生长和氮素吸收利用规律，2011年3—8月，在甘肃省天水市小陇山林科所以2年生楸树无性系1-4、7080和015-1组培苗为试验材料，尿素设置CK、6、10、14 g/株 4个处理，研究指数施肥对3个楸树无性系生长和氮素吸收利用效率的影响。结果表明： 1）3个无性系的苗高、地径和总生物量均随施氮量的增加而先升高后下降， 尿素在10 g/株达到峰值； 苗高分别为142.1、120.0、142.0 cm，比CK上升49%、67%、67%；地径为16.94、16.13、18.28 mm，比CK提高18%、36%、30%；总生物量为193.13、188.91、230.71 g/株， 比CK上升65%、57%、66%。2）3个无性系的氮质量分数和氮含量均表现为叶＞根＞茎， 氮质量分数和氮含量的最大值分别为13.45～27.87 g/kg、0.72～2.07 g/株，比CK上升100%～145%、133%～390%。3) 无性系0151的表观吸收效率、施肥效率、生物量收获指数和氮素收获指数分别为56.92%、43.23 g/g、52.62 g/g、86.05%， 是无性系1-4和7080的1.09～1.26倍；氮素吸收利用参数均随施氮量的增大而显著减小。综合分析得出，指数施肥对楸树无性系的生长、氮质量分数和氮含量具有显著的促进作用，无性系015-1的生长和氮素吸收利用效率高于无性系1-4和7080，3个无性系的最佳施肥量为尿素10～14 g/株。

       

      Abstract: In order to study the regularity of the growth and nitrogen absorption and utilization of different Catalpa bungei clones, an exponential fertilization trial was conducted with four nitrogen dose levels (applying a total of CK, 6 ,10, 14 g/plant), and used two-year-old C. bungei clones 1-4,7080 and 015-1 tissue culture seedlings as experimental material to research the effects of exponential fertilization on seedling growth and nitrogen uptake and utilization efficiency of C. bungei clones from March to August 2011 in Xiaolongshan Mountain Forestry Science and Technology Research Institute, Tianshui City of Gansu Province, northwestern China. Results showed that: 1) The height of seedling, ground diameter and total biomass of C. bungei clones first increased and then decreased with increasing amount of nitrogen, peaking in the urea 10 g/plant. The height of seedlings was 142.1, 120.0, 142.0 cm, rising by 49%, 67%, 67% than CK. The ground diameter was 16.94, 16.13, 18.28 mm, rising by 18%, 36%, 30% than CK. The total biomass was 193.13, 188.91, 230.71 g/plant, rising by 65%, 57%, 66% than CK. 2) The nitrogen concentration and nitrogen content of three C. bungei clones were expressed as leaf root stem. The maximum of nitrogen concentration and nitrogen content were 13.45-27.87 g/kg,0.72-2.07 g/plant, and increased by 100%-145%, 133%-390% respectively compared with CK. 3) The apparent absorption efficiency , fertilization efficiency, biomass harvest index and nitrogen harvest index of clone 015-1 were 56.92%, 43.23 g/g, 52.62 g/g and 86.05%, which were 1.09-1.26 times of clones 1-4 and 7080. Nitrogen uptake and utilization parameters were significantly reduced with increasing amount of nitrogen. Comprehensive analysis showed that the effects of exponential fertilization on growth, nitrogen concentration and nitrogen content of C. bungei clones had a significant role in promoting. The growth and nitrogen uptake and utilization efficiency of clone 015-1 were greater than clones 1-4 and 7080. The optimum fertilization of three clones was urea 10-14 g/plant.

       

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