马鹿放牧对云雾山封育草地植物-土壤系统化学计量特征的影响

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关键词：马鹿放牧；典型草原；长期封育；生态化学计量中图分类号：S812 文献标识码：A 文章编号：1007-0435（2026）04-1391-12

Abstract：Investigatingthe effects of grazing on the ecological chemometric characteristics ofcarbon（C），nitro gen （N），and phosphorus（P） in the plant-soil continuum of long-term enclosed grasslands is crucial for sustainable grassand management.This study investigated a 38-year-old enclosed grassland in Yunwu Mountain， Ningxia，by systematicaly analyzing ecological-metabolic ratios and their coupling relationships at the community level （community-weighted average） for leaves and soil across four grazing intensities of Gansu Ceruus canadensis （Cerus elaphus kansuensis） ： ungrazed，light grazing，moderate grazing，and heavy grazing. Results indicated：（1） Moderate grazing most efectively promoted N and P accumulation. Plant growth shifted from P limitation under no grazing and combined N-P limitation under light/moderate grazing to N limitation under heavy grazing；（2） With increasing grazing intensity，both topsoil soil organic carbon（SOC） and C：N ratio in the topsoil （0～10cm） ） showed an initial increase followed by a decrease，peaking at moderate grazing levels at 40.40g⋅kg-1 and 12.O8，respectively.Conversely，soil N， C：P ，and N：P ratios were the lowest at light grazing levels at 3.22g⋅kg-1 ，48.15，and 4. 43，respectively. All soil parameters decreased with increasing soil depth.（3）Leaf C and ΔN contents showed negative correlations with most soil SOC，N，P，and their ratios，while leaf P content was correlated positively with these parameters. Soil depth influenced both plant leaf and soil chemical parameters，whereas grazing intensity primarily affected soil-related indicators. In summary，grazing significantly influenced the chemical-nutrient characteristics of the plant-soil system in the longterm enclosed grassland of Yunwu Mountain. Moderate grazing promoted plant growth and soil nutrient accumulation，representing a critical grazing intensity threshold for maintaining regional grassland health.These findings provide data support and theoretical basis for further optimizing grazing management and promoting the sustainable use of long-term closed-pasture grasslands.

Key words：Ceruus elaphus grazing;Steppe;Long-term fencing;Ecological stoichiometry

草地作为地球上最重要的陆地生态系统之一，不仅具有生产草畜产品的巨大经济价值，还具有维持生物多样性、固碳释氧、水土保持和调节气候等多种生态功能1，但不合理的封育管理可能带来诸多负面影响。（剩余21521字）