甘南不同退化程度高寒草甸土壤持水能力与化学计量特征研究

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中图分类号：S155.4十7 文献标识码：A 文章编号：1007-0435（2026）01-0107-11

Abstract：To investigate the relationship between soil water-holding capacity and chemical characteristics，as wellas the influencing factors，this study took the high-altitude cold meadows of Gannanas theresearch object， and analyzed the soil water-holding capacity，soil organic carbon（SOC），nitrogen （N），phosphorus（P），soil organic carbon storage（SOCS），total nitrogen storage（TNS），total phosphorus storage（TPS），and stoichiometric ratios.The results indicated that soil water-holding capacity decreased with increasing degradation severity，with the most significant changes in the surface layer；SOC，N，P，SOCS，TNS，carbon-phosphorus ratio（C：P），and nitrogen-phosphorus ratio （N： P） decreased with increasing degradation severity; Soil waterholding capacity was extremely significantly positively correlated with vegetation cover，biomass，height，capil lary porosity，total porosity， SOC，N，P，C：P，N： P，SOCS，and TNS，and extremely significantly negatively correlated with soil bulk density.Monte Carlo tests indicated that soil bulk density had the highest explanatory power for water-holding capacity （81.8%） ，and vegetation cover，soil porosity，SOC，C：P，TN， and TP were significant influencing factors. Therefore，in the ecological restoration and management of alpine meadows，vegetation and soil improvement measures should be optimised in a coordinated manner to simultaneously enhance water retention capacity and ecological functions.

Key words：Alpine meadows;Degradation;Soil water-holding capacity;CNP stoichiometric characterization

土壤持水能力作为土壤基本物理性质之一，是评估水分调节功能和土壤水源涵养功能的重要参数，对生态群落的恢复和重建有重要影响[1]。（剩余20260字）