[1] Sutton MA, Reis S, Riddick SN, et al. Towards a climate-dependent paradigm of ammonia emission and depo-sition. Philosophical Transactions of the Royal Society B-Biological Sciences, 2013, 368: 20130166 [2] Yu GR, Jia YL, He NP, et al. Stabilization of atmospheric nitrogen deposition in China over the past decade. Nature Geoscience, 2019, 12: 424-429 [3] Niu GX, Wang RZ, Hasi M, et al. Availability of soil base cations and micronutrients along soil profile after 13-year nitrogen and water addition in a semi-arid grassland. Biogeochemistry, 2021, 152: 223-236 [4] Bai YF, Wu JG, Clark CM, et al. Tradeoffs and thre-sholds in the effects of nitrogen addition on biodiversity and ecosystem functioning: Evidence from Inner Mongolia grasslands. Global Change Biology, 2010, 16: 358-372 [5] Wang J, Gao YZ, Zhang YH, et al. Asymmetry in above- and belowground productivity responses to N addition in a semi-arid temperate steppe. Global Change Biology, 2019, 25: 2958-2969 [6] Fowler D, Coyle M, Skiba U, et al. The global nitrogen cycle in the twenty-first century: Introduction. Philosophical Transactions of the Royal Society B-Biological Sciences, 2013, 368: 20130165 [7] Collins SL, Knapp AK, Briggs JM, et al. Modulation of diversity by grazing and mowing in native tallgrass prairie. Science, 1998, 280: 745-747 [8] Storkey J, Macdonald AJ, Poulton PR, et al. Grassland biodiversity bounces back from long-term nitrogen addition. Nature, 2015, 528: 401-404 [9] Yang GJ, Lu XT, Stevens CJ, et al. Mowing mitigates the negative impacts of N addition on plant species diversity. Oecologia, 2019, 189: 769-779 [10] Zhou ZY, Sun OJ, Huang JH, et al. Soil carbon and nitrogen stores and storage potential as affected by land-use in an agro-pastoral ecotone of northern China. Biogeochemistry, 2007, 82: 127-138 [11] 戚德辉, 温仲明, 杨士梭, 等. 基于功能性状的铁杆蒿对环境变化的响应与适应. 应用生态学报, 2015, 26(7): 1921-1927 [Qi D-H, Wen Z-M, Yang S-S, et al. Trait-based responses and adaptation of Artemisia sacrorum to environmental changes. Chinese Journal of Applied Ecology, 2015, 26(7): 1921-1927] [12] 宾振钧, 王静静, 张文鹏, 等. 氮肥添加对青藏高原高寒草甸6个群落优势种生态化学计量学特征的影响. 植物生态学报, 2014, 38(3): 231-237 [Bin Z-J, Wang J-J, Zhang W-P, et al. Effects of N addition on ecological stoichiometric characteristics in six dominant plant species of alpine meadow on the Qinghai-Xizang Plateau, China. Chinese Journal of Plant Ecology, 2014, 38(3): 231-237] [13] Lu M, Yang YH, Luo YQ, et al. Responses of ecosystem nitrogen cycle to nitrogen addition: A meta-analysis. New Phytologist, 2011, 189: 1040-1050 [14] Du EZ, Terrer C, Pellegrini AFA, et al. Global patterns of terrestrial nitrogen and phosphorus limitation. Nature Geoscience, 2020, 13: 221-226 [15] Tian DS, Niu SL. A global analysis of soil acidification caused by nitrogen addition. Environmental Research Letters, 2015, 10: 024019 [16] Aber J, McDowell W, Nadelhoffer K, et al. Nitrogen saturation in temperate forest ecosystems: Hypotheses revisited. BioScience, 1998, 48: 921-934 [17] Niu SL, Classen AT, Dukes JS, et al. Global patterns and substrate-based mechanisms of the terrestrial nitrogen cycle. Ecology Letters, 2016, 19: 697-709 [18] Su Y, Ma XF, Le JJ, et al. Decoupling of nitrogen and phosphorus in dominant grass species in response to long-term nitrogen addition in an alpine grassland in Central Asia. Plant Ecology, 2021, 222: 261-274 [19] Sun Y, Wang CT, Chen HYH, et al. Responses of C:N stoichiometry in plants, soil, and microorganisms to nitrogen addition. Plant and Soil, 2020, 456: 277-287 [20] Dong JF, Cui XY, Wang SP, et al. Changes in biomass and quality of alpine steppe in response to N & P fertilization in the Tibetan Plateau. PLoS One, 2016, 11(5): e0156146 [21] 符义稳, 田大栓, 牛书丽, 等. 氮磷添加和干旱对高寒草甸草原优势植物叶片化学计量的影响. 北京林业大学学报, 2020, 42(5): 115-123 [Fu Y-W, Tian D-S, Niu S-L, et al. Effects of nitrogen, phosphorus addition and drought on leaf stoichiometry in dominant species of alpine meadow. Journal of Beijing Forestry University, 2020, 42(5): 115-123] [22] Tian QY, Lu P, Ma PF, et al. Processes at the soil-root interface determine the different responses of nutrient limitation and metal toxicity in forbs and grasses to nitrogen enrichment. Journal of Ecology, 2020, 109: 927-938 [23] 王常慧, 邢雪荣, 韩兴国. 草地生态系统中土壤氮素矿化影响因素的研究进展. 应用生态学报, 2004, 15(11): 2184-2188 [Wang C-H, Xing X-R, Han X-G. Advance in study of factors affecting soil N mineralization in grassland ecosystems. Chinese Journal of Applied Ecology, 2004, 15(11): 2184-2188] [24] Giese M, Brueck H, Gao YZ, et al. N balance and cycling of Inner Mongolia typical steppe: A comprehensive case study of grazing effects. Ecological Monographs, 2013, 83: 195-219 [25] Li SJ, Wang FW, Chen MF, et al. Mowing alters nitrogen effects on the community-level plant stoichiometry through shifting plant functional groups in a semi-arid grassland. Environmental Research Letters, 2020, 15: 074031 [26] Ma FF, Song B, Quan Q, et al. Light competition and biodiversity loss cause saturation response of aboveground net primary productivity to nitrogen enrichment. Journal of Geophysical Research-Biogeosciences, 2020, 125: e2019JG005556 [27] Hou SL, Freschet GT, Yang JJ, et al. Quantifying the indirect effects of nitrogen deposition on grassland litter chemical traits. Biogeochemistry, 2018, 139: 261-273 [28] Goodwillie C, McCoy MW, Peralta AL. Long-term nutrient enrichment, mowing, and ditch drainage interact in the dynamics of a wetland plant community. Ecosphere, 2020, 11: e03252 |