| 生物土壤与生态 |
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| Environmental Effects on Distribution and Composition of Desert Vegetations in Alxa Plateau:Ⅲ. Correlation between plant functional type's diversity and environmental factors |
| HE Ming-zhu |
| Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract According to ecotypes (including xerophyte, mesophyte and hygrophyte), life forms (including shrub, subshrub, perennial grass and biennial or annual plants) and photosynthetic pathway (including C3 and C4), investigated plants are divided into different plant functional types(PFTs), which provides analytic foundation for understanding the structure, function and process of desert ecosystems. PFTs are relatively simple is an important trait for desert vegetation in Alxa, which is mainly induced by simple ecotypes of xerophyte. The dominant PFTs in Alxa are sorted from high to low as: PFTs1(xerophytic C3 annual and biennial grass), PFTs2 (xerophytic C3 perenial grass), PFTs3 (xerophytic C3 shrub), PFTs4 (xerophytic C3 subshrub), PFTs5 (xerophytic C4 annual and biennial grass), PFTs7 (xerophytic C4 shrub) and PFTs8 (xerophytic C4 subshrub). The distribution of PFTs is controlled by climate and soil physical-chemical indices, among which annual precipitation and moisture coefficient control the distribution of ecotypes and life form along horizontal zonality, also affect the distribution of C3 and C4 along the altitudinal zonality; soil bulk weight and percentage of sand and silt determine the characteristics of plant life forms, and content of pH, Cl－, SO2-4 and Ca2+ affect the distribution of ecotypes. These results imply the different responding mechanisms of arid plants to stressed environment, which is a scientific and ecological interpretation for understanding mechanisms of maintaining biodiversity and sustainable development under the extreme environmental conditions.
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Received: 12 July 2008
Published: 20 March 2010
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2010, Vol. 30 
