降水梯度序列下柠条林地土壤养分的空间变异

通过野外实地调查结合室内分析,研究陕西省境内不同降雨条件下的黄土高原同级树龄柠条林地土壤养分。结果表明,研究区土壤养分含量低,养分中有机质和全氮在降水梯度上的空间变异性显著;有机质和全氮含量在土壤剖面上表现为随着土层的加深逐渐减少,全磷含量在土壤剖面上表现为从表层到心土层逐渐降低,从心土层到底层逐渐增加;全钾含量在剖面上的规律与有机质和全氮相反;有机质、全氮、全磷、全钾含量均随着降水梯度的增加而增加;有机质含量与全氮、全钾呈现极显著正相关,与全磷呈现显著正相关关系。

Spatial Variation of Soil Nutrients in Caraganakorshinskii Soil under Precipitation Gradient Sequence

Based on field survey combined with laboratory analysis,spatial variability of soil nutrient in Caraganakorshinskii soil under different precipitation conditions in the loess plateau, Shanxi Province, China was researched. Results show that soil nutrient content in the research district is low, and organic matter and full nitrogen have significant spatial variability under the precipitation gradient. Contents of organic matter and full nitrogen in soil profile reduce with increasing deep of the soil; and full phosphorus content in soil profile gradually reduces from surface to deep layer, and gradually increases from deep layer to the bottom. The distribution law for full potassium content in soil profile is in contrast to organic matter and full nitrogen. The organic matter, full nitrogen, full phosphorus and full potassium contents increase under the precipitation gradient. The organic matter has highly significant positive correlation with full nitrogen and full potassium, and has significant positive correlation with full potassium.