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The stable nitrogen isotopic ratios of particulate organic matter (δ15NPOM) was used to elucidate the seasonal variation and vertical characteristics of the different dissolved inorganic nitrogen sources and autochthonous biogeochemistry processes in two lakes (Hongfeng and Baihua) in Guizhou Province, China. The δ15N values of surface POM seasonally varied from 3.7‰ to 14.9‰ in Lake Hongfeng and from 1.3‰ to 8.7‰ in Lake Baihua. It indicated that source of POM was greatly varied in these two lakes during study period. In Lake Hongfeng, the higher δ15N POM values appeared in winter (February, 2004) and summer (September, 2003). The highest δ15N POM values in winter were attributted to the input of high contents and 15N-enriched inorganic nitrogen from industry wastes. During spring, the δ15N POM values decreased when phytoplankton uptake 14N-enriched inorganic nitrate generated by nitrification in the interior Lake Hongfeng. The variation of δ15N values in surface POM coincided well with the variation of δ15N values of inorganic nitrogen sources. It suggestted that the variation of δ15NPOM mainly influenced by inorganic nitrogen sources, which might resulted from the impact of allochthonous human activities. In Lake Baihua, the higher values of δ15NPOM appeared in summer (September, 2003) while the values were low during winter season. These high and low values were possibly aroused by the growth of primary production and large 15N-depleted organic particles input from sewage respectively. In addition, the combination of δ15NPOM and C/N values in the vertical profile can be used to trace some special biogeochemistry processes in lacustrine ecosystem.

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Seasonal variation and vertical characteristics of the δ&lt;sup&gt;15&lt;/sup&gt;N of particulate organic matter in Lake Hongfeng and Lake Baihua, Guizhou Province