Data from: Low nitrogen addition amplifies the positive effect of grazing exclusion on plant diversity and community stability

That data is the average value from 2021 to 2024.SOC: Soil organic carbon; TN: Soil total nitrogen; TP: Soil total phosphorus; MBC: soil microbial biomass carbon; MBN: Soil microbial biomass nitrogen; MBP: Soil microbial biomass phosphorus; SWC: Soil water content; NH₄⁺-N: Ammonium nitrogen; NO₃^--N: Nitrate nitrogen; PTC: Plant total carbon; PTN: Plant total nitrogen; PTP: Plant total phosphorus; DOC: Dissolved organic carbon; DON: Dissolved organic nitrogen; DOP: Dissolved organic phosphorus; AP: Soil available phosphorus; and AGB: Plant aboveground biomass.