By taking on the exotic plant Spartina? (spartina?anglica)? The naturally declining population was added with n fertilizer, p fertilizer and np compound fertilizer at different gradient levels to analyze the differences in growth indicators of Spartina and its physiological and ecological responses. The results showed that after adding n and p, the plant height of the rice grass population increased to varying degrees, and the fertilizer effects were in order of n fertilizer, p fertilizer, and np fertilizer; the number of leaves, the number of main roots, and the total biomass all increased significantly? (p<0.05). Except for n fertilizer, the leaf area and thickness of other treatments were not significantly different from the control. The addition of the three fertilizer sources significantly increased the photosynthetic rate of the naturally declining population of Spartina? (p<0.05); Both n and np fertilizers have the most significant effect at high concentrations, but p fertilizer has the strongest effect at medium concentrations; the photosynthetic rate increases by 19.08 ¦Ìmol compared with the control? m-2? s-1, 11.23? ¦Ìmol? m-2? s-1 and 15.47? ¦Ìmol? m-2? s-1; After 14 days of fresh water flooding, the addition of fertilizer sources enhanced the sod and pod enzyme activities of the naturally declining population of Spartina; the addition of medium concentration n and medium concentration p increased the sod activity most significantly,? respectively increased by 320.74 compared to the control? unit? g-1 and 134.54? unit? g-1;? What are the uses of adding high-concentration n and high-concentration np fertilizers? pod enzyme activity increased most significantly. The addition of N fertilizer can significantly improve the growth and physiological characteristics of naturally declining Spartina populations. It can be inferred that the decline of Spartina populations is related to the limitation of N nutrients in my country's coastal soil nutrients. For futher details of this article and research, feel free to contact our team for assistance. Original research was done by Li Hongli, Zhi Yingbiao, Zhao Lei, An Shuqing, Deng Zizi, Zhou Changfang, Gu Shuping

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