氮、磷添加对青藏高寒草甸土壤碳氮磷化学计量特征影响的Meta分析

为了解青藏高原高寒草甸土壤碳(Carbon，C)、氮(Nitrogen，N)、磷(Phosphorus,P)化学计量特征对氮、磷添加的响应，提高养分管理水平及草地生态系统的养分平衡。本研究严格筛选出21篇文章(612项数据)进行Meta分析，通过亚组分析分析了不同施肥方式(氮添加、磷添加、氮磷添加)、不同施肥强度(轻度、中度、重度)对青藏高原草地土壤C，N，P化学计量特征的影响。研究结果表明：养分添加显著增加了青藏高原草地土壤C，N，P含量；氮添加对土壤的增加效应随施肥强度增加而增加，磷轻度施肥(20g·m^-2以下)处理、氮磷添加轻度施肥处理下的土壤C，N，P含量及化学计量比增加效果最好。本研究结果总体反映出氮、磷添加对青藏高原高寒草甸土壤产生积极影响，研究结果可为青藏高原草地生态系统的保护提供科学依据。

Meta-Analysis of the Effects of Nitrogen and Phosphorus Addition on the Stoichiometric Characteristics of Soils Carbon,Nitrogen and Phosphorus in Tibetan Alpine Meadow

To understand the response of soil C,N,and P stoichiometric characteristics to N and P addition in alpine meadows on the Tibetan Plateau and improve nutrient management and nutrient balance of grassland ecosystems,21 articles (612 data items) were rigorously selected for Meta-analysis in this study,and the effects of different fertilization methods (N addition,P addition,N+P addition) and different fertilization intensities (light,moderate,and heavy) on soil C,N,and P stoichiometric characteristics of Qinghai-Tibet Plateau meadows were developed through subgroup analysis. The results showed that nutrient addition significantly increased soil C,N,and P contents in Tibetan plateau grassland;the effect of N addition on soil increased with fertilizer application intensity,and the best increase in soil C,N,and P stoichiometric characteristics was observed under light application of phosphorus alone (less than 20 g·m^-2) and the combination of nitrogen and phosphorus. Overall,it reflected that N and P additions had positive effects on alpine meadow soils,and the results of the study provided a scientific basis for the conservation of grassland ecosystems in the Qinghai-Tibet Plateau.