[1] Hessen DO, Elser JJ. Elements of ecology and evolution. Oikos, 2005, 109: 3-5 [2] Sterner RW, Elser JJ. Ecological Stoichiometry: The Biology of Elements from Molecules to the Biosphere. Princeton, NJ, USA: Princeton University Press, 2002 [3] Wang S-Q (王绍强), Yu G-R (于贵瑞). Ecological stoichiometry characteristics of ecosystem carbon, nitrogen and phosphorus elements. Acta Ecologica Sinica (生态学报), 2008, 28(8): 3937-3947 (in Chinese) [4] Zeng D-H (曾德慧), Chen G-S (陈广生). Ecological stoichiometry: A science to explore the complexity of living systems. Acta Phytoecologica Sinica (植物生态学报), 2005, 29(6): 1007-1019 (in Chinese) [5] Belnap J. Biological soil crusts: Characteristics and distribution// Belnap J, Lange OL, eds. Biological Soil Crusts Ecology and Management. New York: Springer, 2001 [6] Zhao YG, Xu MX, Belnap J. Potential nitrogen fixation activity of different aged biological soil crusts from rehabilitated grasslands of the Hilly Loess Plateau, China. Journal of Arid Environments, 2010, 74: 1186-1191 [7] Belnap J. Nitrogen fixation in biological soil crusts from southeast Utah, USA. Biology and Fertility of Soils, 2002, 35: 128-135 [8] Barger NN, Weber B, Garcia-Pichel F, et al. Patterns and controls on nitrogen cycling of biological soil crusts// Weber B, Büdel B, Belnap J, eds. Biological Soil Crusts: An Organizing Principle in Drylands. New York: Springer, 2016: 257-285 [9] Elbert W, Weber B, Burrows S, et al. Contribution of cryptogamic covers to the global cycles of carbon and nitrogen. Nature Geoscience, 2012, 5: 459-462 [10] Zhao Y-G (赵允格), Xu M-X (许明祥), Wang Q-J (王全九), et al. Impact of biological soil crust on soil physical and chemical properties of rehabilitated grassland in Hilly Loess Plateau. Journal of Natural Resources (自然资源学报), 2006, 21(3): 441-448 (in Chinese) [11] Zhao Y-G (赵允格), Xu M-X (许明祥), Wang Q-J (王全九), et al. Physical and chemical properties of soil biocrust on rehabilitated grassland in hilly Loess Plateau of China. Chinese Journal of Applied Ecology (应用生态学报), 2006, 17(8): 1429-1434 (in Chinese) [12] Zhang G-X (张国秀), Zhao Y-G (赵允格), Xu M-X (许明祥), et al. Impacts of biological soil crusts on availability of phosphorus and phosphatase activity in hilly regions of the Loess Plateau, China. Plant Nutrition and Fertilizer Science (植物营养与肥料学报), 2012, 18(3): 621-628 (in Chinese) [13] Gao L-Q (高丽倩), Zhao Y-G (赵允格), Xu M-X (许明祥), et al. The effects of biological soil crust succession on soil ecological stoichiometry characteristics. Acta Ecologica Sinica (生态学报), 2018, 38(2): 678-688 (in Chinese) [14] Fu B-J (傅伯杰), Liu G-H (刘国华), Chen L-D (陈利顶). Scheme of ecological regionalization in China. Acta Ecologica Sinica (生态学报), 2001, 21(1): 1-6 (in Chinese) [15] Fan W-B (范文波), Li X-J (李小娟). Determine the loess soil crust bulk density by film method. Soil and Water Conservation Science and Technology in Shanxi (山西水土保持科技), 2001(3): 9-10 (in Chinese) [16] Castle SC, Morrison CD, Barger NN. Extraction of chlorophyll a from biological soil crusts: A comparison of solvents for spectrophotometric determination. Soil Biology and Biochemistry, 2011, 43: 853-856 [17] Belnap J. Factors influencing nitrogen fixation and nitrogen release in biological soil crusts// Belnap J, Lange OL, eds. Biological Soil Crusts Ecology and Management. New York: Springer, 2001: 241-261 [18] Dong J-W (董金伟), Li Y-P (李宜坪), Li X-K (李新凯), et al. Effects of vegetation types on biocrusts and underlying soil nutrients in Us sandland. Research of Soil and Water Conservation (水土保持研究), 2019, 26(2): 112-117 (in Chinese) [19] Zhao Y-G (赵允格), Xu M-X (许明祥), Belnap J. Response of biocrusts photosynthesis to environmental factors: A possible explanation of the spatial distribution of biocrusts in the Hilly Loess Plateau region of China. Acta Ecologica Sinica (生态学报), 2010, 30(17): 4668-4675 (in Chinese) [20] Zhang X-R (张向茹), Ma L-S (马露莎), Chen Y-N (陈亚南), et al. Ecological stoichiometry characteristics of Robinia pseudoacacia forest soil in different latitudes of Loess Plateau. Acta Pedologica Sinica (土壤学报), 2013, 50(4): 818-825 (in Chinese) [21] Hyvnen R, Persson T, Andersson S, et al. Impact of long-term nitrogen addition on carbon stocks in trees and soils in northern Europe. Biogeochemistry, 2008, 89: 121-137 [22] Zeng Q-C (曾全超), Li X (李 鑫), Dong Y-H (董扬红), et al. Ecological stoichiometry of soils in the Yanhe Watershed in the Loess Plateau: The influence of different vegetation zones. Journal of Natural Resources (自然资源学报), 2016, 31(11): 1882-1891 (in Chinese) [23] Wei X-R (魏孝荣), Shao M-A (邵明安). The distribution of soil nutrients on sloping land in the gully region watershed of the Loess Plateau. Acta Ecologica Sinica (生态学报), 2007, 27(2): 603-612 (in Chinese) [24] Yao C-Z (姚春竹). Accumulation of soil organic matter and nitrogen with biological soil crusts in the Hilly Loess Plateau Region. Journal of Northwest A&F University (Natural Science) (西北农林科技大学学报: 自然科学版), 2014, 42(6): 197-204 (in Chinese) [25] Shaver GR. Plant nutrient-acquisition strategies change with soil age. Trends in Ecology & Evolution, 2008, 23: 95-103 [26] Qin H-L (秦海龙), Fu X-X (付旋旋), Lu Y (卢 瑛), et al. Soil C:N:P stoichiometry at different altitudes in Mao’er Mountain, Guangxi, China. Chinese Journal of Applied Ecology (应用生态学报), 2019, 30(3): 711-717 (in Chinese) [27] Zhu Q-L (朱秋莲), Xing X-Y (邢肖毅), Zhang H (张 宏), et al. Soil ecological stoichiometry under different vegetation area on loess hilly-gully region. Acta Ecologica Sinica (生态学报), 2013, 33(15): 4674-4682 (in Chinese) [28] Cui G-Y (崔高阳), Cao Y (曹 扬), Chen Y-M (陈云明). Characteristics of nitrogen and phosphorus stoichiometry across components of forest ecosystem in Shaanxi Province. Chinese Journal of Plant Ecology (植物生态学报), 2015, 39(12): 1146-1155 (in Chinese) [29] Barger NN, Castle S, Dean GN. Denitrification from nitrogen-fixing biologically crusted soils in a cool desert environment, southeast Utah, USA. Ecological Processes, 2013, 2: 16 [30] Root HT. A field guide to biological soil crusts of wes-tern U.S. drylands. The Bryologist, 2001, 116: 224-225 [31] Harper KT, Belnap J. The influence of biological soil crusts on mineral uptake by associated vascular plants. Journal of Arid Environments, 2001, 47: 347-357 [32] Yan D-R (闫德仁). The effects of biological crusts on the nutrient absorption of vascular plants. Journal of Arid Land Resources and Environment (干旱区资源与环境), 2009, 23(10): 177-181 (in Chinese) |