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极端干旱区胡杨细根的垂直分布和季节动态

夏延国 董芳宇 吕爽 王键铭 井家林 李景文

夏延国, 董芳宇, 吕爽, 王键铭, 井家林, 李景文. 极端干旱区胡杨细根的垂直分布和季节动态[J]. 北京林业大学学报, 2015, 37(7): 37-44. doi: 10.13332/j.1000-1522.20150082
引用本文: 夏延国, 董芳宇, 吕爽, 王键铭, 井家林, 李景文. 极端干旱区胡杨细根的垂直分布和季节动态[J]. 北京林业大学学报, 2015, 37(7): 37-44. doi: 10.13332/j.1000-1522.20150082
XIA Yan-guo, DONG Fang-yu, WANG Jian-ming, JING Jia-lin, LI Jing-wen, . Vertical distribution and seasonal dynamics of fine roots in Populus euphratica plantation in the extremely drought area[J]. Journal of Beijing Forestry University, 2015, 37(7): 37-44. doi: 10.13332/j.1000-1522.20150082
Citation: XIA Yan-guo, DONG Fang-yu, WANG Jian-ming, JING Jia-lin, LI Jing-wen, . Vertical distribution and seasonal dynamics of fine roots in Populus euphratica plantation in the extremely drought area[J]. Journal of Beijing Forestry University, 2015, 37(7): 37-44. doi: 10.13332/j.1000-1522.20150082

极端干旱区胡杨细根的垂直分布和季节动态

doi: 10.13332/j.1000-1522.20150082
基金项目: 

国家自然科学基金项目(310575332)、林业行业公益重大专项(201404304)

详细信息
    作者简介:

    夏延国。主要研究方向:生物多样性。Email:xiayanguowh@126.com 地址:100083北京市清华东路35号北京林业大学林学院。

    责任作者:

    李景文,教授,博士生导师。主要研究方向:生物多样性。Email: lijingwen@bjfu.edu.cn 地址:同上。

Vertical distribution and seasonal dynamics of fine roots in Populus euphratica plantation in the extremely drought area

  • 摘要: 以额济纳胡杨天然林为研究对象,用Minirhizotron方法对胡杨细根的垂直分布和季节动态进行了研究。研究结果表明: 1)总体上,0~20cm土层中胡杨细根的根长密度和根表面积密度最大,且与其他各层存在显著差异(P<0.05); 2)在生长季,0~40cm土层胡杨细根的生长率和生死之比均大于40~80cm土层; 3)胡杨细根的根长密度、根表面积密度和生长率均表现出单峰的季节变化趋势;死亡率在生长季呈逐渐增大的趋势;生死之比在生长季呈现出逐渐减小的季节变化趋势,而且仅在末期小于1,说明胡杨细根的季节动态是一个以生长占优势的生死交织的过程; 4)生长率和死亡率均与土壤温度存在极显著正相关性(P<0.01);生长率与土壤含水量存在极显著正相关性(P<0.01),而死亡率与土壤含水量的相关性均不显著(P>0.05)。

     

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出版历程
  • 收稿日期:  2015-04-17
  • 修回日期:  2015-04-17
  • 刊出日期:  2015-07-31

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