霍林河流域湿地土壤碳氮空间分布特征及生态效应

对霍林河流域湿地土壤有机碳及全氮空问分布特征及其生态效应的研究表明，有机碳和全氮的水平分异和垂直分异都十分显著，干湿交替周期是引起分异的关键因子；表层土壤有机碳与全氮含量显著相关(r=0．977)，土壤碳氮比基本沿湿度梯度变化；土壤pH值对土壤表层碳氮含量及碳氮比值影响显著；流域湿地土壤与流域草原土壤碳氮比与土壤碳氮含量的相关性差异显著；其生态效应主要表现在生产效应和净化效应两方面．

Spatial distribution characteristics and ecological effects of carbon and nitrogen of soil in Huolin River catchment wetland

This paper studied the spatial distribution characteristics and ecological effects of organic carbon and nitrogen in soils of Huolin River catchment wetland in horizontal and vertical levels. The results showed that the differences of horizontal and vertical distribution of organic carbon and nitrogen were very obvious, and of all the factors such as the period of wetting and drying cycles, leaching, plant and flood etc. , the period of wetting and drying cycles was contents the critical one, which caused the differences. Soil organic carbon was significantly correlated with soil nitrogen (r = 0.977). The ratio of carbon and nitrogen(C/N) changed along with the humidity gradient, and soil pH values obviously influenced the concentration of organic carbon and nitrogen. The correlation of C/N values and organic carbon and nitrogen contents in wetland soil and in grassland soil were remarkably different, and the ecological effects mainly included production effect and clarification effect.