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The main areas of forest in Ningxia Province lie in the Helan and Liupan mountain ranges. These forests have important ecological and economic significance. The fertility of forest soil in these areas has not been systematically studied.The objective of this study was to evaluate soil fertility under six forest types in the Su鄄Yukou forest zone of the Helan mountain range and in the Xi鄄Xia and Die鄄Diegou forest zones of the Liupan mountain range. The natural forest types were Pinus tabulaeformis 伊 Populus davidiana, Picea crassifolia 伊 Populus davidiana, Potentilla parvifolia, and Larix principis鄄 rupprechtii. The planted forest types were Quercus liaotungensis and Larix principis鄄rupprechtii. Five separate profiles ( replications) were sampled in an ' S爷 pattern for each soil type. The profiles were divided into A, B, and C horizons and then sampled, making a total of 18 soil samples. Soil physical and chemical properties were measured with conventional methods. The results were analyzed using univariate analysis of variance. Differences among forest types and soil horizons

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