| 生物土壤与生态 |
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| Physiological Response and Morphological Adjustment of Haloxylon ammodendron in Different Habitats against Precipitation Variation |
| ZOU Ting1,2, LI Yan1, XU Hao1, XU Gui-qing1 |
| 1.Fukang Station of Desert Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Haloxylon ammodendron, a native dominant desert shrub, was chosen as the study object, and the variation of soil moisture content, plant physiological response and branch biomass change in sandy soil and heavy textured soil under three precipitation treatments(no, natural and double precipitation, respectively) were monitored during the growing season in 2006. The similarity and difference of physiological response and morphological adjustment of H. ammodendron to precipitation treatment were analyzed. The results indicated that the branch water potential, transpiration and photosynthetic water-use efficiency of H. ammodendron in sandy soil differed significantly under three precipitation treatments, but these parameters of H. ammodendron in heavy-textured soil did not appear a high sensitivity to precipitation variation. Under the three precipitation treatments, the branch growth rate of H. ammodendron differed significantly in heavy textured soil, but not in sandy soil. The integrated analysis of physiological response and morphological adjustment indicated that biomass allocation, or morphological acclimation at individual plant scale maintained photosynthetic stability and the survival of H. ammodendron in different textured soils under different precipitation treatments. H. ammodendron in sandy soil will be favored over those in heavy-textured soil in the natural background of climatic change.
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Received: 31 July 2010
Published: 20 March 2011
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2011, Vol. 31 
