Biologic and Abiotic Factors Regulate Dissolved Organic Nitrogen With Low and High Nutrient Concentrations on Tibetan Plateau, Respectively

Although dissolved organic nitrogen (DON) plays an important role in the dynamic processes of mineralization, fixation, and leaching, ecological driving forces DON across Tibetan Plateau remain largely unknown. Here, we measured climate, soil, plant indicators, concentration on Plateau, used “change-point” analysis to determine patterns. Then correlation was applied analyze relationship between each index. Finally, structural equation modelling (SEM) is explain overall effect environmental factors. Our results showed that two patterns were presented is, low-DON (5.43 g/mg) high-DON (16.36 In pattern, biologic factors such as microbial carbon, nitrogen, productivity main influencing concentration. strongly governed by hydrothermal synchronization superior soil environment. This study can help us have a more comprehensive understanding response mechanism soluble pool alpine ecosystems under climate change.