黄土丘陵区不同植被根际土壤微量元素含量特征
摘要： 为了解黄土高原不同植被土壤微量元素的根际效应，分析了该地区柠条、沙棘、沙打旺、柳枝稷、阿尔泰狗娃花和茵陈蒿6种植被根际与非根际土壤中有机碳、全氮、Mn、Cu、Fe、Zn含量.结果表明： 6种植被中，柠条、阿尔泰狗娃花和茵陈蒿根际土壤的有机碳、全氮含量高于非根际土壤；除柠条和沙棘外，其余4种植被非根际土壤pH值均显著高于根际土壤.6种植被根际土壤有效Mn含量均低于非根际；柠条、沙打旺和柳枝稷根际有效Cu含量显著高于非根际，表现出强烈根际富集现象.除沙打旺外，其他5种植被根际有效Fe含量均略高于非根际.沙打旺、柳枝稷、茵陈蒿和阿尔泰狗娃花表现出强烈的有效Zn根际富集现象.根际与非根际土壤有机碳、全氮与有效Mn、有效Zn，以及有效Mn与有效Zn呈极显著正相关.根际土壤pH值与有效Mn和有效Zn呈显著负相关.由于不同植物根系的生长特征、根际pH值及微生物种类等的差异，不同植被根际的微量元素含量不同，茵陈蒿根际4种微量元素含量高于其他植被.
Abstract: To explore the rhizosphere effect of the microelements in the soils under different vegetation types in Loess Plateau, this paper analyzed the organic C, total N, Mn, Cu, Fe, and Zn contents in the rhizosphere soil and bulk soil of six vegetation types in hilly-gully region of Loess Plateau. Among the six vegetation types, Caragana korshinskii, Heteropappus altaicus, and Artemisia capillaries had higher organic C and total N contents in rhizosphere soil than in bulk soil. With the exception of C. korshinskii and H. rhamnoides, all the six vegetation types had a significantly lower pH in rhizosphere soil than in bulk soil. The six vegetation types had a lower available Mn content in rhizosphere soil than in bulk soil, and the C. korshinskii, Astragalus adsurgen, and Panicum virgatum had a significantly higher available Cu content in rhizosphere soil than in bulk soil. The six vegetation types except A. adsurgens had a slightly higher available Fe content in rhizosphere soil than in bulk soil, and A. adsurgens, P. virgatum, H. altaicus, and A. capillaries had a significant accumulation of available Zn in rhizosphere soil. There existed significant positive correlations between the rhizosphere soil and bulk soil of the six vegetation types in the relationships between the organic C and total N contents and the available Mn and Zn contents and between the contents of available Mn and Zn. In rhizosphere soil, available Mn and Zn contents were significantly negatively correlated with pH value. Due to the differences in root growth characteristics, rhizosphere pH value, and microbial structure composition, the microelements contents in the rhizosphere soil of the six vegetation types differed, with the contents of Mn, Cu, Fe, and Zn being higher in the rhizosphere soil of H. altaicus than in that of the other vegetation types.
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