Abstract: The effects of external nitrogen (N) inputs on coastal wetland ecosystems are not independent, but combined with other environmental factors. Previous studies mainly focused on the effects of single N inputs. Limited information of multi-factor interaction is available, especially the relationship between N and other nutrients. We summarized the interactive effects of nitrogen inputs and other nutritional factors on coastal wetland ecosystems. The results showed that the heterogeneity was presented between effects of single nutrient factor and multi-factor interaction on coastal wetland ecosystems. The interactions can be divided into three types: positive, negative, and neutral. Moreover, four important research directions should be considered in future: (1) carrying out longterm positioning observation of control experiment; (2) exploring the method of transforming small-scale control experiment to large-scale application; (3) comprehensive considering the saturation threshold of nutrient elements and maximum predicted input value to scientifically set the upper line of exogenous nutrient inputs; (4) constructing the coupling model of interaction of multiple environmental factors and plant microbe soil system.

Key words: forest fire, risk assessment, climate change, possibility, vulnerability.