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土壤水分动态对胡杨幼苗生长分配策略的影响

张现慧 钟悦鸣 谭天逸 吕爽 王健铭 李景文

张现慧, 钟悦鸣, 谭天逸, 吕爽, 王健铭, 李景文. 土壤水分动态对胡杨幼苗生长分配策略的影响[J]. 北京林业大学学报, 2016, 38(5): 92-99. doi: 10.13332/j.1000-1522.20150369
引用本文: 张现慧, 钟悦鸣, 谭天逸, 吕爽, 王健铭, 李景文. 土壤水分动态对胡杨幼苗生长分配策略的影响[J]. 北京林业大学学报, 2016, 38(5): 92-99. doi: 10.13332/j.1000-1522.20150369
ZHANG Xian-hui, ZHONG Yue-ming, TAN Tian-yi, WANG Jian-ming, LI Jing-wen, . Effect of soil moisture dynamics on growth and allocation strategy of Populus euphratica seedlings[J]. Journal of Beijing Forestry University, 2016, 38(5): 92-99. doi: 10.13332/j.1000-1522.20150369
Citation: ZHANG Xian-hui, ZHONG Yue-ming, TAN Tian-yi, WANG Jian-ming, LI Jing-wen, . Effect of soil moisture dynamics on growth and allocation strategy of Populus euphratica seedlings[J]. Journal of Beijing Forestry University, 2016, 38(5): 92-99. doi: 10.13332/j.1000-1522.20150369

土壤水分动态对胡杨幼苗生长分配策略的影响

doi: 10.13332/j.1000-1522.20150369
基金项目: 

国家自然科学基金项目(3157061031070553)、林业公益性行业科研专项(201404304-6)

详细信息
    作者简介:

    张现慧。主要研究方向:生物多样性。Email:zhangxianhui0627@163.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,博士,教授。主要研究方向:生物多样性。Email:lijingwen@bjfu.edu.cn 地址:同上。

Effect of soil moisture dynamics on growth and allocation strategy of Populus euphratica seedlings

  • 摘要: 分析土壤水分对幼苗地上及地下部分生长及其分配策略是阐明自然生境中胡杨种子更新困难以及人工培育成活率低的重要途径。本文以2年生胡杨幼苗为研究材料,采用不同土壤水分处理试验,监测幼苗地上部分生长指标(地径、冠幅、株高、叶片数)以及地下部分生长指标(总根长、总根表面积、单位平方米土壤总根长、总根体积),分析不同水分处理及水分梯度对幼苗生长的影响。结果表明:对于胡杨幼苗地上部分的生长,在连续给水处理时,25%含水量更有利于地上部分的生长;而断续给水处理时,最适土壤含水量为30%;胡杨幼苗地下部分生长在不同给水处理下存在显著差别,而25%的含水量要显著区别于其他水分梯度,更有利于根系的生长。一定程度的干旱胁迫后,断续给水比连续给水更有利于根系的生长,且水分梯度在20%~25%之间最有利于根系生物量的积累,地下生物量的积累大于地上生物量,这种地上与地下生长权衡作用有利于幼苗纵向生长的养分、水分获取。在根系构型方面,在土壤水分条件好的情况下则有利于幼苗根系的横向扩展。

     

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出版历程
  • 收稿日期:  2015-10-26
  • 修回日期:  2015-10-26
  • 刊出日期:  2016-05-31

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