| 生物土壤与生态 |
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| Ecophysiological Characteristics of Artemisia ordosica Community Succession in Mu Us Sandy Grassland |
| ZHANG Jun; HUANG Yong-mei; JIAO Hui-jing; XIA Xian-dong |
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Abstract As a common species in semi-arid sandland, Artemisia ordosia constitutes the dominant community in Mu Us sandy grassland. It is necessary to clarify the ecophysiological mechanism of community succession for the vegetation reconstruction in semi-arid region. Field observation and experiment showed significant differences in adaptive capacity to the environment and other ecophysiological characteristics of three succession stages of Artemisia ordosia community, i.e., the open stage, blooming stage, and fading stage. Accompanying with the increasing community coverage, the soil water content increased at 0\_20 cm depth while decreased at 20\_80 cm depth. Lower net photosynthesis rate, light saturation point, and light energy and water utilization rate thus happened for Artemisia ordosia in fading stage than in open and blooming stages. It was also shown that the stomatal conductivity of Artemisia ordosia was linearly dependent on the leaf water potential in each of the three stages, with the highest slop in the fading stage. Based on the relations between stomatal conductivity and water circulation, the main driving factors of the succession was also discussed in the paper.
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Received: 01 January 1900
Published: 20 November 2007
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2007, Vol. 27 
