古尔班通古特沙漠4种草本植物叶片与土壤的化学计量特征

Leaf and soil stoichiometry of four herbs in the Gurbantunggut Desert,China

在荒漠极端环境下,对2种短命植物（角茴香和土大戟）和2种类短命植物（簇花芹和弯花黄芪）叶片与土壤化学计量特征及其相互关系进行研究.结果表明：每个物种所有样地的各土壤因子之间均无显著差异;土壤氮（N）含量（0.18-0.22 mg·g^-1）远低于土壤磷（P）含量（1.58-1.62 mg·g^-1）,N/P仅为0.12-0.15,表现出严重的土壤N缺乏.4种植物叶片N、P含量及N/P之间均有显著差异,其中,弯花黄芪最大,分别为57.36 mg·g^-1、2.46 mg·g^-1及23.43,角茴香其次,分别为34.05 mg·g^-1、1.98 mg·g^-1及17.56,土大戟分别为27.07 mg·g^-1、1.87 mg·g^-1及14.51,簇花芹分别为28.63 mg·g^-1、2.20 mg·g^-1及13.10.各物种N、P含量之间均具有显著的相关性,但绝大部分土壤因子与叶片化学计量值之间没有显著相关性.

The leaf and soil stoichiometric characteristics and their relationships of two ephemeral plants（ Hypecoum erectum and Euphorbia turczaninowii） and two ephemeroid plants（ Ferula meyeri and Astragalus flexus） were analyzed in extreme desert environment. There was no significant difference among each soil factor in different sampling plots of each species. Soil nitrogen（ N） content（ 0.18-0.22 mg·g^-1） was far lower than soil phosphorus（ P） content（ 1.58-1.62 mg·g^-1）,and the N / P only ranged 0.12-0.15,indicating a serious lack of soil N. N,P and N / P all represented significant difference among the four species,in which A. flexus had the highest values with 57.36mg·g^-1,2.46 mg·g^-1and 23.43,followed by H. erectum with 34.05 mg·g^-1,1.98 mg·g^-1and17.56,the values for E. turczaninowii were 27. 07 mg · g^-1,1.87 mg·g^-1and 14. 51,and the values for F. meyeri were 28.63 mg·g^-1,2.20 mg·g^-1and 13.10,respectively. N and P contents showed significant correlation of each species,while most soil factors did not show significant correlation with leaf stoichiometric values.