关键词: 土壤有机碳, 毛竹, 经营措施, 化学结构, 物理分组

Abstract: A hydroponic study was conducted to investigate the biomass, root morphology, and zinc (Zn), calcium (Ca) and sulfur (S) contents of two Sedum alfredii- ecotypes under effects of different concentration calcium (Ca²⁺) addition. The results showed that with increasing exogenous Ca²⁺ concentration, the dry mass of the two S. alfrediiecotypes increased, and the shoot dry mass of hyperaccumulation ecotype increased significantly (P<0.05). The root length and root surface area of hyperaccumulation ecotype increased with increasing exogenous Ca²⁺ concentration, while those of nonhyperaccumulation ecotype were in adverse. The Zn accumulation in the root, stem and leaf of hyperaccumulation ecotype was increased with increasing exogenous Ca²⁺ concentration though the differences among Ca²⁺ treatments were not significant (P>0.05), while the Zn accumulation in the shoot of nonhyperaccumulation ecotype was significantly low (P<0.05). The Ca accumulation in the root, stem and leaf of non-hyperaccumulation ecotype had a significant positive correlation with the concentration of exogenous Ca²⁺ (P<0.05), so as the S accumulation in the root of hyperaccumulation ecotype (P<0.01). Exogenous Ca²⁺ promoted the Zn absorption and accumulation of hyperaccumulation ecotype, while inhibited the Zn accumulation of nonhyperaccumulation ecotype. Appropriate concentration of exogenous Ca²⁺ could promote the growth of hyperaccumulation ecotype S. alfredii, and improve its ability of accumulating more zinc.

Key words: Phyllostachys edulis, management measure, soil organic carbon, physical fractionation, chemical structure