学术
塔克拉玛干沙漠腹地梭梭幼苗根系分布特征对不同灌溉量的响应
单立山[1,2] 张希明[1] 花永辉[3] 魏疆[1,2] 闫海龙[1,2] 解婷婷[1,2]
[1]中国科学院新疆生态与地理研究所,乌鲁木齐830011 [2]中国科学院研究生院,北京100049 [3]新疆水利水电科学研究院,乌鲁木齐830049
摘 要:
在塔克拉玛干沙漠腹地，采用分层分段挖掘法对不同灌溉量条件下（每株每次灌水35、24．5和14妇）梭梭（Haloxylon ammodendron）幼苗根系的分布特征进行了研究。结果表明：1）随着灌溉量的减少，梭梭幼苗根系生物量的分布格局有向深层发展的趋势，在不同灌溉量条件下地下垂直各层生物量与土壤垂直深度呈显著的负对数关系；2）各灌溉量梭梭幼苗的最大水平根长为垂直根长的2倍，但不同灌溉量根系生物量的水平分布趋势一致；3）吸收根生物量的垂直分布与土壤含水量的垂直变化基本一致，均呈“单峰型”曲线，但灌溉量不同，吸收根生物量峰值在土壤中出现的位置也不同，随着灌溉量的减少，吸收根集中分布区有向深层发展的趋势；4）根长、根表面积和根体积随着土壤深度的增加均呈“单峰型”曲线，灌溉量愈小，根长、根表面积和根体积的峰值愈位于土壤的深层；5）根冠比和垂直根深与株高之比随着灌溉量的减少而呈增加的趋势。[著者文摘]
文章出处:
《植物生态学报》-2007年31卷5期 -769-776页
栏目信息:
分 类 号:
RESPONSE OF ROOT DISTRIBUTION OF HALOXYLON AMMODENDRON SEEDLINGS TO IRRIGATION AMOUNTS IN THE TAKLIMAKAN DESERT, CHINA
SHAN Li-Shan, ZHANG Xi-Ming , HUA Yong-Hui, WEl Jiang, YAN Hal-Long,XIE Ting- Ting（1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciencez, Urumqi 830011, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3.Xinjiang Institute of Water Resources and Hydropower Research, Urumqi 830049, China）
Abstract:
Aims As a primary limiting factor affecting survival and growth of plants, moisture has important effects on above- and below-ground morphological characteristics. We studied root distribution characteristics in the Tarim Desert Highway Protection Forest to provide suggestions for water management. Methods We excavated soil to study root distribution in Haloxylon ammodendron seedlings grown with different amounts of irrigation （35, 24.5 and 14 kg· ind. plant^- 1· once^- 1 ） in the Taklimakan Desert. Important findings With less irrigation, the distribution of mot biomass shifted to greater depth. Underground biomass had a significantly negative logarithmic relationship with soil depth under different irrigation amounts. Maximum horizontal spread of roots was twice that of vertical root spread, and horizontal distribution of root biomass was consistent under all irrigation amounts. The vertical distribution of absorptive roots was nearly consistent with vertical changes of soil moisture; all had a unimodal curve, but peak values of absorptive roots biomass were in different soil layers with different irrigation amounts. With smaller amounts of irrigation, absorptive roots were concentrated in deeper soil layers. Root length, root surface area and root volume all exhibited a unimodal curve under different irrigation amounts; the less irrigation, the deeper the peak values. Root-shoot ratios and proportion of vertical root depth and plant height increased as irrigation amounts decreased.[著者文摘]
Key words:
root system, root surface area, underground biomass, root-shoot ratio
基金资助:
中国科学院知识创新工程重要方向性项目（KZCX3-SW-342-02）和科技部“西部开发科技行动”重大项目（2004BA901A21-1）本研究根系挖掘工作得到中国科学院新疆生态与地理研究所塔中沙漠植物园工作人员的大力帮助,在此表示感谢
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