<b>Threshold response </b><b>of arbuscular mycorrhizal mycelial respiration to </b><b>a nitrogen </b><b>addition gradient in an alpine </b><b>grassland</b>

The raw data of all indicators under six levels of N additions treatments are given in the dataset, and the data provided can be directly used for mapping and analysis of variance. In every sheet, 0 g N m-2 year-1 (N0, control), 2 g N m-2 year-1 (N2), 4 g N m-2 year-1 (N4), 8 g N m-2 year-1 (N8), 16 g N m-2 year-1 (N16), 32 g N m-2 year-1 (N32). datasets included: Fig. 1 is a conceptual model figure and does not include any data. Fig. 2：The raw data of RAMF, RAMF/Ra and RAMF/Rs. Fig. 3：The raw data of Plant richness, Plant coverage, Aboveground biomass and Root biomass. Fig. 4：The raw data of AMF biomass, OTU richness, Shannon diversity and the relative abundance of AMF families. Fig. 5-6：The raw data of RAMF, Moisture, pH, SIN, Plant richness, Root biomass, Plant coverage, AMF biomass, Shannon diversity and Glomeraceae. Fig. S1 are the experimental design of N addition plots and does not include any data. Fig. S2： The raw data of Rs. Fig. S3：The raw data of soil temperature and moisture. Fig. S4：The raw data of RAMF, Moisture, pH, SIN, Plant richness, Root biomass, Plant coverage, AMF biomass, Shannon diversity and Glomeraceae. Table S1: The raw data of pH, TC, TN, TP, SIN, MBC and MBN. Raw data: the raw data for all indicators in the article. These raw data are used to evaluate the relationships between various variables.