不同水分条件下疏叶骆驼刺(Alhagi sparifolia)生长及根系分株构型特征
收稿日期: 2012-02-22
修回日期: 2012-05-16
网络出版日期: 2012-05-16
Root Growth and Ramets Architecture Characteristics of Alhagi sparsifolia under Different Water Treatments
Received date: 2012-02-22
Revised date: 2012-05-16
Online published: 2012-05-16
以塔克拉玛干沙漠南缘优势植物种疏叶骆驼刺(Alhagi sparsifolia)为对象，在策勒荒漠草地生态系统国家野外科学观测研究站进行田间试验，对不同水分条件下疏叶骆驼刺幼苗根系生长特征、分株地上部分生长特征、分株根系构型特征进行了研究。结果表明：疏叶骆驼刺幼苗根冠比在不同水分处理之间差异不显著，根系深度随着土壤水分有效性的降低逐渐增加;分株地上部分指标均随土壤水分有效性降低显著减小，除处理B（灌溉量180 mm，灌溉1次）和处理C（灌溉量90 mm，灌溉2次）之间地上生物量差异不显著外，不同处理之间分株株高、冠幅、地上生物量差异均达到显著水平（p<0.05）;不同水分条件下疏叶骆驼刺分株种群密度、分株之间间隔物长度差异显著（p<0.05）;随着土壤水分有效性由高到低变化，分株生长格局逐步由“密集型”向“游击型”过渡，分枝角度之间差异不显著，且全部集中在90°左右;通过对分株层土壤水分含量与分株数量的分析发现，二者具有较好的相关性，分株数量随土壤含水量变化呈二次曲线变化。
关键词： 疏叶骆驼刺(Alhagi sparifolia); 克隆生长; 分株构型; 分株生长格局
张利刚1 , 2 , 曾凡江1 , 袁 娜3 , 刘 波1 , 2 , 罗维成1 , 2 , 宋 聪1 , 2 , 彭守兰1 , 2 . 不同水分条件下疏叶骆驼刺(Alhagi sparifolia)生长及根系分株构型特征[J]. 中国沙漠, 2013 , 33(3) : 717 -723 . DOI: 10.7522/j.issn.1000-694X.2013.00103
We chose the dominant plant species Alhagi sparsifolia in the south fringe of the Takelamkan Desert as object, measured and analyzed the effects of different irrigation (A, total 360 mm,twice; B, total 180 mm,once; C, total 180 mm,twice; D,total 0 mm) on the characteristics of root growth of seedlings, aboveground part growth of ramets, root architecture of ramets in Qira, Xinjiang, China. The results showed that the root-shoot ratios of A. sparsifolia seedlings were not significantly different among the four treatments, the root growth depth increased with decreasing soil moisture; the number of the abovegound part of ramets all decreased with increasing soil moisture under different treatments; the plant height, aboveground biomass of ramets under different treatments were significantly different except that aboveground biomass between treatment B and treatment C(p<0.05); the density of ramet population and the spacer between ramets under different treatments were significantly different(p<0.05); ramets growth patterns were from phalanx to guerrilla with decreasing water supply, the branching angle were about 90°, among the four treatments were not significantly different(p＞0.05); we found that the soil moisture content of the soil had good correlations with the number of ramets, the number of ramets were in a quadratic curve when the soil moisture content increased.
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