三峡库区消落带云阳段土壤养分含量及分布特征

Soil Nutrient Content and Distribution Characteristics in Fluctuation Zone of Three Gorges Reservoir Area in Yunyang

为探索消落带水土环境的变化及相互影响,为水库消落带生态系统的进一步研究奠定基础,以三峡库区云阳段消落带为研究区,通过野外采样和室内分析,对消落带土壤的有机质、TP及TN含量特征进行了分析。结果表明:土壤有机质含量处于一级,为60～110g/kg,平均80g/kg,其含量随海拔减少呈下降趋势;土壤总磷含量大多数处于三、四级,为0.2～0.8g/kg,平均0.54g/kg,其含量随海拔减少呈下降趋势淹水有利于有机质和总磷的解析;土壤总氮含量差异较大,为0.4～1.6g/kg,平均0.93g/kg,其含量随海拔降低有上升的趋势。结论,表层土壤的有机质与总氮含量高于深层土壤,表层土壤的全磷含量低于深层土壤。

By field sampling and laboratory analysis,the author studied the organic matter,TP and TN in soil of fluctuation zone of Three Gorges Reservoir area in Yunyang to explore the water and soil environment variation and their interaction,and provide a basis for further studying the ecosystem.The result indicated that soil organic matter content was 60~110 g/kg with an average of 80 g/kg,which was in level one.The majority of TP content was 0.2~0.8 g/kg with an average of 0.54 g/kg,which was in level three or four.With the elevation decreasing,the content of organic matter and TP declined.So flooding was conducive to parsing for organic matter and TP.The TN content of the soil in the study area was quite different.Its content was 0.4 ~ 1.6 g/kg and the mean value was 0.93 g/kg.The organic matter and TN of surface soil were higher than the deep soil,but the TP of surface soil was lower than the deep soil.