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《Journal of Arid Land Resources and Environment》 2015-02
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The influence of soil moisture on the succession of Artemisia ordosica community in Mu Us Sandland

YU Xiaona;HUANG Yongmei;CHEN Huiying;LI Xiaoyan;LI Liu;College of Resources Science and Technology,Beijing Normal University;  
Space-time substitution was applied to evaluate the community characteristics,biomass,gas exchange process of leaf,soil moisture content of different layers( 0-10 cm,10-20 cm,20-40 cm,40-60 cm and 60-80cm) with ECH2 O EC-TM,vertical distribution of roots and so on,under three different succession stages of Artemisia ordosica community( A. ordosica community in semi-fixed dune,A. ordosica community with biological crusts and A. ordosica + Stipa bungeana community). The succession of A. ordosica community was the result of combination of abiotic and biotic factors such as the competition of A. ordosica and herbaceous,the development of biological crusts and soil,the vertical distribution of soil moisture,and so on. With the succession development of A. ordosica community,the number of species in community,herbaceous coverage,herbaceous biomass,total community coverage gradually increased,while the number of A. ordosica individuals,A.ordosica coverage,leaf biomass of A. ordosica and the coverage of biological crusts presented the trend of increase firstly and then decreased. The root distribution presented downward trend as the development of succession,while herb roots gradually dominated in the soil layer of 0-10 cm with the development of A. ordosica community. The proportion of A. ordosica fine roots collected at 0-40 cm depth in the semi-fixed,fixed dune with biological crusts,and A. ordosica + Stipa bungeana community was 75. 69%,79. 10% and 42. 34%,respectively,but the fine roots distributed at 20-80 cm depth in A. ordosica + Stipa bungeana community was 77.87%. Soil moisture was the main driving force for the succession of A. ordosica community in Mu Us Sandland,which could affect the competitiveness by influencing the net photosynthetic rate,stomatal conductance and root vertical distribution of A. ordosica. The low soil moisture content area was different during the succession processes. The soil moisture content of A. ordosica community in semi-fixed dune was the lowest in 0-10 cm and 20-40 cm soil layers; the soil moisture content of 10-20 cm was the lowest in A. ordosica community with biological crusts; while in the A. ordosica + Stipa bungeana community,the soil moisture content of 60-80 cm was the lowest.
【Fund】: 国家杰出青年科学基金(41025001);; 长江学者和创新团队发展计划(IRT1108);; 中央高校基本科研业务费专项(2012CXQT07)资助
【CateGory Index】: Q948.1
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