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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。
Through field investigation combined with indoor analysis, the soil nutrients of Caragana korshinskii in the same level of rainfall in Shaanxi Province were studied. The results showed that the soil nutrient content was low in the study area, and the spatial variability of soil organic matter and total nitrogen in the precipitation was significant. The content of organic matter and total nitrogen in the soil profile decreased with the deepening of the soil layer, The soil profiles showed a gradual decrease from surface to heart and soil layers and a gradual increase from the soil layers to the bottom. The profile of total potassium in the profiles was opposite to that of organic matter and total nitrogen. The contents of organic matter, total nitrogen, total phosphorus and total potassium And increased with the increase of precipitation gradient. There was a significant positive correlation between organic matter and total nitrogen and total potassium, and a significant positive correlation with total phosphorus.