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Chinese Journal of Ecology. 2013, (08) Core

Allocation patterns of above-and below-ground biomass of Caragana microphylla in Horqin Sandy Land,North ChinaChinese Full Text

NIU Cun-yang 1,2 ,Alamusa 1** ,ZONG Qin 2 ,LUO Yong-ming 1 ,Toshio Oshid 3 ,SUN Gui-fan 4 ,LIU Qian 4 ( 1 Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China; 2 University of Chinese Academy of Sciences,Beijing 100049,China; 3 Azabu University,Sagamihara 252-5201,Japan; 4 Wengniute Banner Forestry Bureau,Inner Mongolia,Wengniute Banner 024500,Inner Mongolia,China)

Abstract: Taking the 4-and 18-year-old artificial plantations and the natural stand of Caragana microphylla in Horqin Sandy Land as the objects,and through digging root system by layers,this paper investigated the features of C. microphylla root distribution in different vegetation zones, and studied the responses of C. microphylla in its biomass allocation,root / shoot ratio,and root distribution to dry environment. The C. microphylla tended to allocate more biomass to roots. Among the three vegetation zones,natural stand and 4 years old artificial plantation had the largest and the smallest proportion of below-ground biomass,respectively. The root biomass decreased gradually with soil depth,and the roots were mainly distributed in the 0-100 cm soil lay- er. The biomass of the absorptive roots of 4 years old C. microphylla plantation was more distributed in surface soil layer,being significantly greater than that of 18 years old plantation and natural stand （ P＜0. 05） in 0-50 cm soil layer. However,the 18 years old plantation and the natural stand had more absorptive root biomass in 50-100 cm soil layer. The conductive root biomass of natural stand in 50 -100 cm soil layer was significantly greater than that of 4- and 18-year-old plantations. The relationships between the above-and below-ground biomass allocations of C. microphylla were characterized by allometry model.
Keywords：

Horqin Sandy Land; Caragana microphylla; above- and below-ground biomass; resource utilization pattern.;

  • DOI：

    10.13292/j.1000-4890.2013.0403

  • Series：

  • Subject：

  • Classification Code：

    S793.9

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