Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS

Plant Coefficient Variation and Adaptability Evaluation of Different Succession Communities on the Loess Plateau

  • 1. Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2007-12-04

  Revised date: 2008-04-30

  Online published: 2008-09-28


Many studies has been taken on calculating the vegetation ecological water requirement using plant coefficient(Kp)and potential evapotranspiration(PET),while attention is rarely paid to restriction of soil water deficit and very little information is available on Kp of different communities especially on the Loess Plateau. According to the succession sequence of vegetation in Ziwuling forest region of the Loess Plateau, herbaceous community, shrub community, early forest community and climax forest community were selected to investigate the water consumption and ecological adaptability of different succession stage, considering the soil water stress simultaneously. Using the data getting from long-term experiments in situ, plant coefficients of different communities were calculated in this study, the actual evapotranspiration(ETa)and mean soil water contents during the growing stage for five representative communities were compared, and the impacts of soil water change on water absorption of plant roots and soil water availability were analyzed.The results showed that,in different succession stages of vegetation,ETa of communities was mainly influenced by precipitation, with no notable distinction among different communities(P>0.05); soil water content of the early stage of forest community was significantly higher than other communities, and that of the herbaceous community was clearly higher than the two shrub communities(P<0.05); the plant coefficients of the shrub communities were the highest, that of herbaceous community was the second and that of climax community was higher than early stage of forest community; the two forest communities had significantly higher soil water availability than the herbaceous and shrub communities (P<0.05),which might consume more soil water and aggravate the drought of soil.Therefore, not only the plant coefficients but also the soil water availability should be considered in vegetation construction. And the soil water restriction factor should not be ignored in the calculation of vegetation ecological water requirement and the adaptability evaluation.

Cite this article

WU Yuan-zhi, HUANG Ming-bin, ZHAO Shi-wei . Plant Coefficient Variation and Adaptability Evaluation of Different Succession Communities on the Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2008 , 23(5) : 849 -857 . DOI: 10.11849/zrzyxb.2008.05.012


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