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水曲柳根系生物量、比根长和根长密度的分布格局

梅莉1;王政权1;韩有志1,2;谷加存1;王向荣1;程云环1;张秀娟1   

  1. 1东北林业大学林学院,哈尔滨 150040;2山西农业大学林学院,太谷030801

  • 收稿日期:2004-12-15 修回日期:2005-04-12 出版日期:2006-01-18 发布日期:2006-01-18

Distribution patterns of Fraxinus mandshurica root biomass,specific root length and root length density

MEI Li1;WANG Zhengquan1;HAN Youzhi1,2;GU Jiacun1;WANG Xiangrong1;CHENG Yunhuan1;ZHANG Xiujuan1   

  1. 1College of Forestry,Northeast Forestry University,Harbin 150040,China;2College of Forestry,Shanxi Agricultural University,Taigu 030801,China
  • Received:2004-12-15 Revised:2005-04-12 Online:2006-01-18 Published:2006-01-18

摘要: 采用连续钻取土芯法在生长季内对东北林业大学帽儿山实验林场17年生水曲柳人工林根系取样,研究水曲柳不同直径根系现存生物量、比根长和根长密度及垂直分布状况.结果表明,水曲柳人工林根系总生物量为1 637.6 g·m-2,其中活根生物量占85%,死根占15%.在活根生物量当中,粗根(直径5~30 mm)占的比例最高(69.95%),其次为活细根(直径<1 mm,13.53%),小根(1~2 mm)和中等直径的根(2~5 mm)比例较小(分别为7.21%和9.31%).直径<1 mm活细根的比根长为32.20 m·g-1,直径5~30 mm粗根的比根长为0.08 m·g-1.单位面积上活根的总长度为6 602.54 m·m-2,其中直径<1 mm的细根占92.43%,其它直径等级则不到活根总长度的8%.直径<1 mm的细根生物量与根长密度具显著线性关系(R2=0.923),但与比根长无显著相关关系(R2=0.134).

关键词: 镧, 根质膜透性, 根分泌物, 离子含量

Abstract: Employing soil core method,an investigation in Maoershan Experiment Station was made on the root biomass,specific root length (SRL),and root length density (RLD) of Fraxinus mandshurica plantation (17 yr) within a growth season in stand level.The results showed that the total root biomass was 1 637 g·m-2,in which,living biomass accounted for 85%,and necrotic biomass was 15%.In the living biomass,coarse roots (5~30 mm in diameter) had the highest percentage (69.95%),followed by fine roots (<1 mm in diameter) (13.53%),medium roots (2~5 mm in diameter) (7.21%),and small roots (1~2 mm in diameter) (9.31%).Among the four diameter classes,fine roots had a higher SRL (32.20 m·g-1),while coarse roots had a lower one (0.08 m·g-1).The total RLD in living biomass was 6 602.54 m·m-2 in stand level,among which,fine root accounted for 92.43%,and the others was less than 8%.Fine root biomass and RLD had a positive correlation with soil available nitrogen,while no significant correlation was found between SRL and soil available nitrogen.

Key words: Lanthanum, Membrane permeability, Root exudate, Nutrient content