While it is established that dominant plant species of alpine meadows showed differential preference for N forms (ammonia, nitrate, and amino acids) under various degradation stages, the perseverance of the N-uptake preference and its affecting factors remains unknown. This is an important consideration because it determines efficacy of nutrient additions for restoration of degraded alpine meadows. An indoor pot experiment was conducted to investigate the plasticity and determinants of different plant species’ N-uptake preference using ¹⁵N-labeled inorganic N (¹⁵NH₄⁺ and ¹⁵NO₃⁻) and one of dual-labeled (¹³C-¹⁵N) amino acid (glycine). In the experiment, dominant species of alpine meadow from specific degradation status were planted in soils of alpine meadows with three different degradation status. Most species preferred to uptake nitrate in all soils, except the Kobresia humilis, Carex moorcroftii, and Aster flaccidus planted in the soil of severely degraded alpine meadow (SD-soil) that take up more ammonia. The relative abundance of different available N forms directly affects the N-uptake preferences of all species. The partial correlations between percentage uptake and availability of various N forms were different with the zero-order correlations when either soil moisture or pH was controlled. Differences in soil moisture and pH among the three alpine meadows affects the N uptake preference of the nine species through their impacts on the relative abundance of different available N forms. In conclusion, the differences in soil moisture and pH among soils of alpine meadows under different degradation statuses influence the relative abundance of various available N forms, thereby affecting the plant N uptake.

虽然高寒草甸优势植物物种在不同退化阶段对氮形态（氨、硝酸盐和氨基酸）表现出不同的偏好，但氮吸收偏好的持久性及其影响因素仍不清楚。这是一个重要的考虑因素，因为它决定了营养添加对恢复退化高山草甸的功效。采用¹⁵ N 标记无机氮（ ¹⁵ NH ₄ ⁺和¹⁵ NO ₃ ^- ）和双标记之一（ ¹³ C- ^{15 ）}进行室内盆栽实验，研究不同植物物种氮吸收偏好的可塑性和决定因素。 N) 氨基酸（甘氨酸）。试验中将特定退化状态的高寒草甸优势种种植在三种不同退化状态的高寒草甸土壤中。大多数物种都喜欢在所有土壤中吸收硝酸盐，但种植在严重退化的高寒草甸土壤（SD-土壤）中的嵩草、苔草和松菀除外，它们吸收更多的氨。不同有效氮形式的相对丰度直接影响所有物种的氮吸收偏好。当控制土壤湿度或pH值时，各种氮形态的吸收百分比和有效性之间的偏相关性与零级相关性不同。三个高寒草甸土壤湿度和 pH 值的差异通过影响不同有效氮形态的相对丰度来影响九个物种的氮吸收偏好。 综上所述，不同退化状态下高寒草甸土壤水分和pH值的差异影响着各种速效氮的相对丰度，从而影响植物对氮的吸收。