藏西沙化草地养分特征及分布规律

Nutrient Characteristics and Distribution Law of Desertification Grassland in Western Tibet

[目的]明确藏西沙化草地养分特征及分布规律。[方法]对藏西完全沙化草地0~100 cm剖面进行样品采集,测定有机质、全氮、全磷、有效磷、全钾、速效钾的含量。[结果]在土壤剖面0~100 cm内,有机质含量为0.51~2.88 g/kg,全氮含量为0.125~0.268 g/kg,全磷含量为0.32~0.47 g/kg,有效磷含量为0.071~2.374 mg/kg,全钾含量为14.03~14.54 g/kg,速效钾含量为42.58~106.45 mg/kg;与土壤深度呈现良好线性关系的为有机质、全氮、速效磷和速效钾;有机质和全氮、全磷、速效钾间存在显著相关性。[结论]该研究为藏西沙化草原的治理提供了理论依据。

[Objective]To clear the nutrient characteristics and distribution law of desertification grassland in western Tibet.[Method]To collect the samples from 0~100 cm section of completely desertified grassland in western Tibet,measure the organic matter,total nitrogen,total phosphorus,available phosphorus,total potassium,available potassium.[Result]For the soil profile range from 0 to 100 cm,organic matter was 0.51-2.88 g/kg,total nitrogen was 0.125-0.268 g/kg,total phosphorus was 0.32-0.47 g/kg,available phosphorus was 0.071-2.374 mg/kg,total potassium was 14.03-14.54 g/kg,available potassium was between 42.58-106.45 mg/kg.The organic matter,total nitrogen,available phosphorus and available potassium had good fitting curve with soil depth.The organic matter,total nitrogen,available phosphorus and available potassium had significant correlation.[Conclusion]The results provided theoretical basis for the control of desertification grassland in western Tibet.