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在青海柴达木盆地选择6个重要的唐古特白刺(Nitraria tangutorum)分布区域,通过测定不同白刺居群的土壤p H、有机质(OM)、全氮(N)、全磷(P)、全钾(K)、碱解N、有效P和速效K含量,对比不同白刺居群间的土壤养分差异,分析其空间变异性以及与地理位置的相关关系。结果表明:1土壤养分含量存在显著空间变异性,土层深度对土壤养分含量有显著影响,但各养分指标含量随土层深度变化规律不明显。2 3个土层深度(0~15,15~30,30~45cm)土壤p H、OM、全N、全P、全K、碱解N、有效P、速效K含量平均值变化范围分别是:8.37~9.21、3.34~20.68、0.18~1.21、0.35~0.75、16.12~22.04、5.13~553.28、1.10~52.54 g/kg和103.83~562.28 mg/kg。3 3个土层深度的各土壤养分含量平均值之间相关性分析结果表明,土壤养分含量之间存在不同程度的相关性。4 3个土层的土壤OM和全N含量纬度、经度和海拔分别呈显著正相关、负相关和负相关,表层土壤(0~15 cm)有效P和速效K含量与纬度、经度和海拔分别呈显著正相关、负相关和负相关,经度和海拔还显著影响30~45 cm深土壤速效K含量。此外,综合分析各养分含量发现怀头他拉镇白刺居群土壤肥力最高,而茶卡镇和乌兰柯柯镇肥力相对较低。
Six important Nitraria tangutorum regions were selected in Qaidam Basin, Qinghai Province. Soil P H, OM, N, , Total potassium (K), alkaline hydrolysis N, available P and available K, and compared the differences in soil nutrients among different populations. The spatial variability and its correlation with the geographical position were analyzed. The results showed that: 1 There was a significant spatial variability of soil nutrient content, soil depth had a significant effect on soil nutrient content, but the content of each nutrient index was not obvious with the soil depth. The ranges of p H, OM, total N, total P, total K, alkaline hydrolysis N, available P, available K content of soil in 23 soil depths (0-15, 15-30, 30-45cm) : 8.37 ~ 9.21,3.34 ~ 20.68,0.18 ~ 1.21,0.35 ~ 0.75,16.12 ~ 22.04,5.13 ~ 553.28,1.10 ~ 52.54 g / kg and 103.83 ~ 562.28 mg / kg. The results of the correlation analysis of the average values of soil nutrient contents in the three soil depths showed that the soil nutrient contents had different degrees of correlation. The soil OM and N contents of 4 soil layers were positively and negatively related to the latitude, longitude and altitude, respectively. The available P and available K contents of topsoil (0 ~ 15 cm) and latitude, longitude and altitude were respectively There were significant positive correlations, negative correlations and negative correlations. Longitudes and altitudes also significantly affected soil available K content in the depths of 30-45 cm. In addition, a comprehensive analysis of the nutrient content found that the population of the Baijian population in Huitou Tala was the highest, while the fertility of Chaka and Ulan Koko townships was relatively low.