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不同温度条件下杉木、桤木和火力楠细根分解对土壤活性有机碳的影响

刘艳1,2;汪思龙1;王晓伟1,2;于小军1;杨跃军3   

  1. 1中国科学院沈阳应用生态研究所会同森林生态实验站, 沈阳 110016;
    2中国科学院研究生院, 北京 100039;
    3国家林业局调查规划设计院, 北京100714
  • 收稿日期:2006-01-11 修回日期:2006-12-07 出版日期:2007-03-18 发布日期:2007-03-18

Effects of tree species fine root decomposition on soil active organic carbon

LIU Yan1,2; WANG Si-long1; WANG Xiao-wei1,2; YU Xiao-jun1; YANG Yue-jun3   

  1. 1Huitong Experimental Station of Forest Ecology, Institute of Applied Ecology, Chinese Academy
    of Sciences, Shenyang 110016,China;
    2Graduate University of Chinese Academy of Sciences, Beijing 100039, China;
    3Academy of Forest Inventory and Planning, State Forestry Administration, Beijing 100714, China
  • Received:2006-01-11 Revised:2006-12-07 Online:2007-03-18 Published:2007-03-18

摘要: 通过室内培养试验,研究了不同温度(9 ℃、14 ℃、24 ℃和28 ℃)条件下桤木、杉木和火力楠细根分解对土壤活性有机碳的影响.结果表明,不同树种细根的分解率不同,树种间差异显著,大小依次为火力楠>桤木>杉木.细根分解率随着培养温度的增加而增大,随着培养时间的延长而降低.添加细根的种类、培养温度和培养时间均对实验系统中土壤微生物碳和水溶性有机碳的含量产生影响.3个树种细根分解使土壤微生物碳和水溶性有机碳含量显著高于对照,大小依次为火力楠>桤木>杉木>对照; 培养中期以及中等培养温度条件下细根分解对应着较高的土壤微生物碳和水溶性有机碳含量.细根分解对土壤易氧化碳含量无显著影响.

关键词: 荒漠植物, 生物量, 估算, 冠丛特征

Abstract: With incubation test, this paper studied the effects of fine root decomposition of Alnus cremastogyne, Cunninghamia lanceolata and Michelia macclurei on the content of soil active organic carbon at 9 ℃, 14 ℃, 24 ℃ and 28 ℃. The results showed that the decomposition rate of fine root differed significantly with test tree species, which was decreased in the order of M. macclurei> A. cremastogyne > C. lanceolata. The decomposition rate was increased with increasing temperature, but declined with prolonged incubation time. Fine root source, incubation temperature, and incubation time all affected the contents of soil microbial biomass carbon and water-soluble organic carbon. The decomposition of fine root increased soil microbial biomass carbon and water-soluble organic carbon significantly, and the effect decreased in the order of M. macclurei> A. cremastogyne > C. lanceolata. Higher contents of soil microbial biomass carbon and water-soluble organic carbon were observed at medium temperature and middle incubation stage. Fine root decomposition had less effect on the content of soil readily oxidized organic carbon.

Key words: Desert plant, Biomass, Estimation, Crown characteristic