青海湖流域草地土壤碳氮含量及密度空间分布特征研究

打开文本图片集

中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2026）01-0203-14

Abstract：In this study，there were 163 selected sampling sites with a totalof 489 sampling plots in the grassland of Qinghai Lake Basin.And the spatial distribution characteristics of soil total carbon（TC），soil organic carbon（SOC），total nitrogen（TN） content and density（TCD，SOCD and TND） in different grassand types were studied by means of field sampling and experimental analysis，mathematical statistics and spatial analysis methods. Results showed that the soil average TC content in the 0-10cm ， 10-20cm and 20-30cm layers were 5.60% ， 4.72% and 4.30% ，respectively. Corresponding SOC content averaged 4.40% ， 3.70% ，and 3.34% ； TN content were O. 46% ， 0.37% ，and 0.30% . The average values of TCD in the cor responding soil layers were 5.75kg⋅m-2 ， 6.07kg.m-2 and 6.01kg⋅m-2 ，respectively.The average values of SOCD were 4.53kg⋅m-2 ， 4.75kg*m-2 and 4.67kg⋅m-2 ，respectively. The average values of TND were 0.46kg.m-2 ， 0.46kg.m-2 and 0.42kg⋅m-2 ，respectively.Alpine meadow soils exhibited the highest carbon and nitrogen contents，whereas alpine desert soils showed the lowest. Spatiall，the content and density of soil TC，SOC and TN were lower in the northwestern of the basin，on the northern shore of Qinghai Lake，in the headwaters of Buha river and Shaliu river，and higher in the middle reaches of allrivers.Soil cumulative SOC and TN contents and densities in the O-30 cm depths were collectively influenced by annual mean precipitation， vegetation coverage， and ecosystem gross primary productivity.

Key words：Soil carbon and nitrogen content; Soil carbonand nitrogen density; Spatial distribution; Qinghai Lake Basin

土壤是地球表层系统各圈层间进行物质循环和能量交换的纽带，在维持生物多样性、保障生态系统稳定性及调节气候等众多方面发挥着重要作用[1-3]。（剩余22358字）