Few systemic assessments have evaluated the success of these afforestation programs in alpine semiarid desert ecosystems in the Qinghai‐Tibet Plateau. In this study, we investigated the influences of three Salix cupularis plantation age classes (6, 18, and 34 years) on the carbon (C), nitrogen (N), and phosphorus (P) storages and stoichiometry of the soil–plant ecosystem. The consequences of S. cupularis plantation induced soil spatial heterogeneity. The soil–plant ecosystem C storage increased after the plantation. The N storage showed an increasing trend from 6 to 18 years and then slightly decreased. The P storage presented a continuously declining trend. The result indicated that the imbalance in soil N, P, C occurred with plantation age because of the imbalance of their inputs. The N and P uptakes from subsoil and redistribution to topsoil by S. cupularis may contribute to meet N and P demands for the understory plants. Leaf N:P ratios varied from 8.3 to 17.5. These results imply that N and P status are the main factors limiting plant growth in the alpine‐cold desert ecosystem. Thus, we recommend adding N and P fertilizers during plant growth.

中文翻译：

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高山半干旱沙漠生态系统中柳柳人工造林对碳，氮和磷的影响

很少有系统的评估来评估这些造林计划在青藏高原的高山半干旱沙漠生态系统中的成功。在这项研究中，我们调查了三种柳柳人工林年龄等级（6、18和34岁）对土壤-植物生态系统的碳（C），氮（N）和磷（P）贮藏量和化学计量的影响。S的后果。 库珀利斯人工林引起的土壤空间异质性。种植后土壤-植物生态系统的碳储量增加。氮存储量从6年到18年呈增加趋势，然后略有下降。磷储量呈现持续下降的趋势。结果表明，土壤氮，磷，碳的失衡是由于人工林输入的失衡引起的。S从下层土壤吸收N和P并重新分配到表层土壤。 铜绿可能有助于满足林下植物对氮和磷的需求。叶片N：P比率从8.3到17.5。这些结果表明，氮和磷的状态是限制高寒沙漠生态系统植物生长的主要因素。因此，我们建议在植物生长期间添加氮和磷肥料。