张军红, 吴波, 雷雅凯, 李秀梅, 何季, 高达布希拉图. 毛乌素沙地油蒿植株形态与结构特征分析[J]. 西南林业大学学报, 2011, 31(5): 6-9. DOI: 10.3969/j.issn.2095-1914.2011.05.002
引用本文: 张军红, 吴波, 雷雅凯, 李秀梅, 何季, 高达布希拉图. 毛乌素沙地油蒿植株形态与结构特征分析[J]. 西南林业大学学报, 2011, 31(5): 6-9. DOI: 10.3969/j.issn.2095-1914.2011.05.002
ZHANG Junhong1, WU Bo1, LEI Yakai1, LI Xiumei1, HE Ji1, GAO Dabuxilatu2. Analysis of Artemisia ordosica Plant Morphology and Structure Characteristics in Mu Us Sandland[J]. Journal of Southwest Forestry University, 2011, 31(5): 6-9. DOI: 10.3969/j.issn.2095-1914.2011.05.002
Citation: ZHANG Junhong1, WU Bo1, LEI Yakai1, LI Xiumei1, HE Ji1, GAO Dabuxilatu2. Analysis of Artemisia ordosica Plant Morphology and Structure Characteristics in Mu Us Sandland[J]. Journal of Southwest Forestry University, 2011, 31(5): 6-9. DOI: 10.3969/j.issn.2095-1914.2011.05.002

毛乌素沙地油蒿植株形态与结构特征分析

Analysis of Artemisia ordosica Plant Morphology and Structure Characteristics in Mu Us Sandland

  • 摘要: 毛乌素沙地除夏季外,其他3季主导风向均为西北风。受此影响,壮龄油蒿植株形态与结构出现方向上的差异,西北方向油蒿植冠半径显著短于其他3个方向,而东南、东北和西南3个方向上植冠半径无显著差异。距植株根部相同距离处,东南方向叶面积指数显著大于西北方向,而天空可见度显著小于西北方向,西南、东北方向叶面积指数与天空可见度均无显著差异,且值介于东南、西北方向之间。主导风向不但影响油蒿植冠半径,而且影响不同方向上植株枝叶密度,造成与主导风向相对的西北方向油蒿枝条稀疏、叶片稀少。对油蒿植株形态与结构影响最大的3个因素分别是:冬季风向频率×风速、冬季风向频率、春季风向频率×风速。

     

    Abstract: The dominant wind was northwest in Mu Us sand land area except summer. There were differences in morphological and structural characteristics of the muture Artemisia ordosica plants in different orientation because of the dominant wind aspect. The crown radius in the northwest direction was significantly shorter than that of in the rest three directions, while there were no significant differences in the crown radius among the other three directions. The LAI value in the southeastern direction was significantly greater than that of in the northwestern within the same distances from the plant roots, while the DIFN value in the southeastern direction was significantly lower than the northwestern direction. There were no significant differences in either LAI or DIFN values between the southwest and northeast directions, whose values were between the southeastern and northwestern directions. The study showed that the dominant wind influenced upon not only the crown radius but also the foliage densiy in different directions, causing sparser branches and less leaves in the windward northwestern direction. The most important three factors affecting the morphological and structural characteristics of Artemisia ordosica plants were the wind frequency × wind speed in the winter season, the frequency of wind directions in the winter and the wind frequency× wind velocity in the spring season.

     

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