摘要:为探究内蒙古包头黄河湿地土壤空间分布特征、生态化学计量学特征及其指示意义，以黄河包头段沿线从东到西的3种典型类型共6块湿地为研究对象，对其不同土层土壤碳（C）、氮（N）和磷（P）化学计量特征及环境因素进行研究分析。结果表明：1）SOC、TN和TP平均值分别为11.20、0.42、0.98 g/kg，SOC、TN含量随土层深度增加而垂直波动减小，TP含量垂直方向上差异不显著。2）土壤C/N、C/P、N/P平均值分别为25.39、9.26、0.37，与中国淋溶土、干旱土和沼泽湿地土壤相比，包头市黄河湿地土壤TN含量、C/P和N/P较低，TP含量较高。3）相关性分析结果显示，土壤TN与SOC、TP、N/P和C/P具极显著正相关（P<0.01），与C/N相关性不显著；土壤TP与SOC、TN、C/N和C/P呈极显著正相关（P<0.01），与N/P相关性不显著，TP含量高但有效性较低，TN含量及其有效性可能是限制包头黄河湿地土壤碳、氮、磷等元素循环及其生态化学计量特征的关键因子。研究结果将为包头黄河湿地的植被重建、生态修复和科学管理提供理论依据。



Abstract:To explore the spatial distribution characteristics and ecological stoichiometric characteristics of the Yellow River wetland in Baotou, Inner Mongolia, we collected the soil samples in different depths of six wetlands of three typical types from east to west along the Baotou section of the Yellow River in this study. We analyzed soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), and the relationship between ecological stoichiometry characteristics and environmental factors. The results indicated that: 1)the average values of the SOC, TN and TP in soil of the wetland were 11.20 g/kg、0.42 g/kg and 0.98 g/kg, respectively. The contents of SOC and TN in the vertical direction had a decreasing trend with increasing soil depth. There's no significant difference of the contents of TP in different soil layers. 2) The average values of soil C/N, C/P, and N/P were 25.39, 9.26, and 0.37, respectively. Compared with alfisols and aridisols in China and other marsh wetlands, the contents of TN, the values of C/P and N/P in Yellow River wetland of Baotou were lower, and the content of TP was higher. 3) The correlation analysis showed that soil total nitrogen was significantly positively correlated with soil organic carbon, total phosphorus, N/P and C/P (P<0.01), but not significantly correlated with C/N. The soil total phosphorus was significantly positively correlated with soil organic carbon, total nitrogen, C/N, and C/P (P<0.01), but not significantly correlated with N/P. TP content was higher but its effectiveness was lower. Soil total nitrogen content and its availability may be the main factor limiting the carbon, nitrogen, phosphorus, and other elements circulation and ecological stoichiometric characteristics in the Yellow River wetland in Baotou. Our results will provide the theoretical basis for vegetation reconstruction, ecological restoration, and scientific management of the Yellow River wetland in Baotou.





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