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生态学杂志 ›› 2010, Vol. 29 ›› Issue (08): 1488-1492.

• 研究报告 • 上一篇    下一篇

追施氮肥对尾巨桉叶片主要营养元素浓度及贮量变化的影响

周 桦1,宇万太1**,马 强1,徐永刚1,陈进宁2,陈桂金2,李俊真2,张日华2   

  1. 1中国科学院沈阳应用生态研究所,沈阳 110016;2广西南宁市高峰林场,南宁 530001
  • 出版日期:2010-08-06 发布日期:2010-08-06

Effects of topdressing nitrogen fertilization on the concentration and storage of major nutrients in eucalyptus leaves.  

ZHOU Hua1, YU Wan-tai1, MA Qiang1, XU Yong-gang1, CHEN Jin-ning2, CHEN Gui-jin2, LI Jun-zhen2, ZHANG Ri-hua2   

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China|2Gaofeng Forest Farm of Nanning in Guangxi, Nanning 530001, China
  • Online:2010-08-06 Published:2010-08-06

摘要: 采用田间定位试验方法,研究了追施氮肥对尾巨桉叶片养分浓度与贮量及内外循环的影响。结果表明:桉树落叶时质量损26%,此时若以单位质量计算叶片养分浓度往往与实际情况不符,因此应以单位叶面积为基础表征养分浓度;与生长叶相比,桉树凋落叶中灰分和有机质含量分别下降33%和25%,表明一些可水解运输的有机物质在叶片凋落前已回输至树体;桉树叶片对N的利用率高达44%,表明存在氮的奢侈吸收。桉树叶片中N、P、K养分以内循环模式为主,内循环比例均在70%以上;Ca则以外循环为主,外循环比例约为90%;Mg、Si和灰分的内循环能力相当,外循环比例略高于内循环。

关键词: 黑土, CH4排放, 微生物生物量C, 土壤呼吸

Abstract: A field experiment was conducted to investigate the effects of topdressing nitrogen on the concentrations and storage of major nutrients and their internal and external fluxes in  Eucalyptus urophylla × E. grandis  leaves. The mass loss of the fallen leaves was 26%, and thus, to characterize the nutrients concentration by per unit mass was not correspondent with reality, while the nutrients concentration per unit area was a correct characterization. Comparing with those in living leaves, the ash and organic matter contents in fallen leaves decreased by 33% and 25%, respectively, suggesting that some hydrolyzable organic matter was transferred back to the trees before leaf fallen. The nitrogen use efficiency of eucalyptus leaves was up to 44%, showing the luxury absorption of N. The trunk and branch recovered more than 70% of N, P, and K in fallen leaves, indicating that the three elements were mainly cycled in internal flux. Calcium was mainly in external flux, with the scale being about 90%. The internal fluxes of Mg, Si, and ash were almost the same, and their external flux scale was slightly higher than their internal flux scale.

Key words: Black earth, CH4 emission, Microbial biomass, Soil respiration