Synergistic impacts of climate change and human activities on spatiotemporal organic nitrogen burial variation in a plateau lake in southwest China

The concentration and sources of organic nitrogen (ON) in lake sediment significantly affect the cycle. However, influencing factors contributors to ON accumulation rate (ONAR) are unclear. In this study, three cores from northern, eastern, southern Dianchi Lake (DC-N, DC-E, DC-S, respectively), sampled July 2014, were used study effects autochthonous allochthonous on ON. results showed that ONAR increased 2.4–5.1 2.6–4.8 times, respectively, 1900 2000, especially since 1980s, at which point algal blooms occurred more frequently. contents decreased order: DC-S > DC-N whereas values followed suggesting was influenced by content as well depositional environmental conditions. total concentrations n-alkanes (n-C12 n-C34) ranged 4719 ng g-1 61,960 cores, each exhibited different characteristic variation with vertical depth. mainly (soil erosion terrestrial plants) (algal aquatic DC-N, they primarily mixed planktonic DC-E. Using stochastic impacts regression population, affluence, technology (STIRPAT) model further examine revealed a 1% increase air temperature fertilizer could be correlated stimulation 23%–33% 20%–79% basin, urban land area reduction 2%–11%, DC-N. Therefore, our suggests warmer wetter climate combined increasing chemical application influences spatial temporal sedimentary Lake.