| 科尔沁沙地两种典型灌木独生和混交的根系分布规律 |
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| 引用本文： | 黄刚,赵学勇,赵玉萍,苏延桂.科尔沁沙地两种典型灌木独生和混交的根系分布规律[J].中国沙漠,2007,27(2):239-243. |
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| 作者姓名： | 黄刚 赵学勇 赵玉萍 苏延桂 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所奈曼沙漠化研究站,甘肃,兰州,730000;中国科学院研究生院,北京,100049
2. 中国科学院寒区旱区环境与工程研究所奈曼沙漠化研究站,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金;中国科学院科研基金 |
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| 摘 要： | 对比研究了科尔沁沙地黄柳、差不嘎蒿这两种典型灌木在独生和混交情况下的根系分布和根量变化。结果表明,独生情况下,黄柳根量要显著的高于差不嘎蒿。在整个剖面,黄柳总根量为30.84 kg.m-3,是差不嘎蒿的5.47倍。差不嘎蒿根系主要分布在0—20 cm的表层,黄柳根系主要分布在20—50 cm的深层土壤中。混交条件下,黄柳总根量为9.94 kg.m-3,相比于独生根量明显减少,差不嘎蒿为5.45 kg.m-3,并没有多大变化,但在距冠丛50 cm、100 cm处根量要大于独生(P<0.05),尤其是细根生物量有了显著增加。同独生相比,黄柳根系在深层和水平方向上扩展,但其总根、粗根、细根生物量均未有显著增加(P>0.05);差不嘎蒿的根系由主要在表层分布变化为在各层均匀分布。混交条件下两种植物之间的竞争是导致根系发生上述变化的原因之一。
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| 关 键 词： | 黄柳 差不嘎蒿 混交林 根系 演替 |
| 文章编号： | 1000-694X（2007）02-0239-05 |
| 收稿时间： | 2005-11-21 |
| 修稿时间： | 2005-12-07 |
Roots Distribution of Two Typical Shrubs in Single or Mixture Circumstance in Horqin Sandy Land |
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| HUANG Gang,ZHAO Xue-yong,ZHAO Yu-ping,SU Yan-gui.Roots Distribution of Two Typical Shrubs in Single or Mixture Circumstance in Horqin Sandy Land[J].Journal of Desert Research,2007,27(2):239-243. |
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| Authors: | HUANG Gang ZHAO Xue-yong ZHAO Yu-ping SU Yan-gui |
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| Institution: | 1.Naiman Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Root distribution and biomass changes of Salix gordejevii and Artemisia Halodendron on single or mixture circumstance in Horqin Sandy Land were comparatively researched. Results showed that in single circumstance, the root biomass of Salix gordejevii was significantly higher than that of Artemisia Halodendron. The total root biomass of single Salix gordejevii were 30.84 kg\5m-3 , those were 5.47 times of that of Artemisia Halodendron. Roots of Salix gordejevii mainly distributed in layer of 20—50 cm, while that of Artemisia Halodendron located in 0—20 cm depth of soil layer. Under mixture circumstance, the total root biomass of single Salix gordejevii were 9.94 kg\5m-3, which decreased significantly. The root biomass of Artemisia Halodendron was 5.45 kg\5m-3, which was similar to one of single condition, but the number of total root biomass was larger than that of single condition at 50 cm and 100 cm far away the center of shrub, particularly of fine root biomass(≤0.1 mm in diameter). Compared with single circumstance, the roots of Salix gordejevii expanded toward to deeper layers on vertical and larger extent on horizontal. But its root biomass didnt increase significantly(P>0.05). Root distribution of Artemisia Halodendron changed from clustering in up layer to distributing equally. The increasing of nutrition of soil, rising of spatial heterogeneity and intraspecific competition were responsible for the above root changes. |
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| Keywords: | Salix gordejevii Artemisia Halodendron mixed plantation root distribution succession |
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