论文部分内容阅读
本研究通过采用氮的K边X光吸收近边结构(XANES)技术来了解森林土壤有机氮,以此深入研究土壤中有机氮种类与其转化的定量关系。土壤样品采自台湾中部的云杉、铁杉林与草地。结果表明,氮的 XANES 可以揭示样品中不同的氮的种类。在土壤腐植质、可溶性氮及本体土壤中胺态及吡咯氮占了主要的比率。然而不同处理及植被下的土壤样品氮的种类分布是不同的。云杉与铁杉土壤可溶性有机氮在402.3 eV 能量处有显著的差异。在A层土壤中,吡啶类氮含量要显著高于O层土壤,说明氮在不同土层中的转化率存在极大的差异,这种变化对于氮在森林土壤中的循环将起重要作用。图3表1参8。
In this study, by using nitrogen X-ray absorption near edge structure (XANES) technology to understand the soil organic nitrogen, in order to further study the quantitative relationship between soil organic nitrogen species and its conversion. Soil samples were collected from spruce, hemlock and meadow in central Taiwan. The results show that nitrogen XANES can reveal the different nitrogen species in the sample. Amounts of ammonium and pyrrolopyron have predominated in soil humus, soluble nitrogen, and bulk soils. However, the distribution of nitrogen in soil samples under different treatments and vegetation is different. Spruce and hemlock soil soluble organic nitrogen at 402.3 eV energy at significant differences. In layer A soil, the content of pyridine nitrogen was significantly higher than that of layer O, which indicated that the conversion of nitrogen in different soil layers had a great difference, which would play an important role in the nitrogen cycle in forest soil. Figure 3 Table 1 reference 8.