[1] Department of Animal Husbandry and Veterinary, General Station of Animal Husbandry and Veterinary of Ministry of Agriculture of China (中华人民共和国农业部畜牧兽医司,全国畜牧兽医总站). Rangeland Resources of China. Beijing: China Science and Technology Press, 1996 (in Chinese) [2] Shen H-H (沈海花), Zhu Y-K (朱言坤), Zhao X (赵 霞), et al. Analysis of current grassland resources in China. Chinese Science Bulletin (科学通报), 2016, 61(2): 139-154 (in chinese) [3] Delgado-Baquerizo M, Maestre FT, Gallardo A, et al. Decoupling of soil nutrient cycles as a function of aridity in global drylands. Nature, 2013, 502: 672-676 [4] Long M, Wu HH, Smith MD, et al. Nitrogen deposition promotes phosphorus uptake of plants in a semi-arid temperate grassland. Plant and Soil, 2016, 408: 475-484 [5] Lebauer DS, Treseder KK. Nitrogen limitation of net primary productivity in terrestrial ecosystems is globally distributed. Ecology, 2008, 89: 371-379 [6] Woodmansee RG, Dodd JL, Bowman RA, et al. Nitrogen budget of a shortgrass prairie ecosystem. Oecologia, 1978, 34: 363-376 [7] Zhang B-G (张宝贵), Li G-T (李贵桐). Roles of soil organisms on the enhancement of plant availability of phosphorus. Acta Pedologica Sinica (土壤学报), 1998, 35(1): 104-111 (in Chinese) [8] Zhou L-K (周礼恺). Soil Enzymology. Beijing: Science Press, 1987: 116-206 (in Chinese) [9] Liu X, Ying Z, Han W, et al. Enhanced nitrogen deposition over China. Nature, 2013, 494: 459-462 [10] Shi Y, Sheng L, Wang Z, et al. Responses of soil enzyme activity and microbial community compositions to nitrogen addition in bulk and microaggregate soil in the temperate steppe of Inner Mongolia. Eurasian Soil Science, 2016, 49: 1149-1160 [11] Malhi SS, Harapiak JT, Nyborg M, et al. Total and light fraction organic C in a thin Black Chernozemic grassland soil as affected by 27 annual applications of six rates of fertilizer N. Nutrient Cycling in Agroecosystems, 2003, 66: 33-41 [12] Turner BL, Chudek JA, Whitton BR. Phosphorus composition of upland soils polluted by long-term atmosphe-ric nitrogen deposition. Biogeochemistry, 2003, 65: 259-274 [13] Mack MC, Schuur EA, Bretharte MS, et al. Ecosystem carbon storage in arctic tundra reduced by long-term nutrient fertilization. Nature, 2004, 431: 440-443 [14] Neff JC, Townsend AR, Gleixner G, et al. Variable effects of nitrogen additions on the stability and turnover of soil carbon. Nature, 2002, 419: 915-917 [15] Tian J, Wei K, Condron LM, et al. Impact of land use and nutrient addition on phosphatase activities and their relationships with organic phosphorus turnover in semi-arid grassland soils. Biology and Fertility of Soils, 2016, 52: 675-683 [16] Wang R, Filley TR, Xu Z, et al. Coupled response of soil carbon and nitrogen pools and enzyme activities to nitrogen and water addition in a semi-arid grassland of Inner Mongolia. Plant and Soil, 2014, 381: 323-336 [17] Hassink J, Neeteson JJ. Effect of grassland management on the amounts of soil organic N and C. The Netherlands Journal of Agricultural Science, 1991, 39: 225-236 [18] Yang S (杨 山). Effects of Water and Fertilizer Addition on Soil Microbial Characteristics in a Typical Grassland of Inner Mongolia. PhD Thesis. Shenyang: Shen-yang University, 2014 (in Chinese) [19] Yu Y-Y (于跃跃), Zhao B-Z (赵炳梓). Effect of amendment inorganic nitrogen and glucose on soil microbial biomass and activity. Acta Pedologica Sinica (土壤学报), 2012, 49(1): 139-146 (in Chinese) [20] Xu L-L (徐丽丽), Wang Q-B (王秋兵), Zhang X-Y (张心昱), et al. Effects of applying different kind fertilizers on enzyme activities related to carbon, nitrogen, and phosphorus cycles in reddish paddy soil. Chinese Journal of Applied Ecology (应用生态学报), 2013, 24(4): 909-914 (in Chinese) [21] Jia J-X (贾俊仙), Li Z-P (李忠佩), Che Y-P (车玉萍). Effects of glucose addition on N transformations in paddy soils with a gradient of organic C content in subtropical China. Scientia Agricultura Sinica (中国农业科学), 2010, 43(8): 1617-1624 (in Chinese) [22] Zhang L (张 乐), He H-B (何红波), Zhang J-X (章建新), et al. Effect of glucose addtion with different amount on extraneous nitrogen transformation in soil. Chinese Journal of Soil Science (土壤通报), 2008, 39(4): 775-778 (in Chinese) [23] Lu R-K (鲁如坤). Soil and Agro-chemistry Analysis. Beijing: China Agricultural Science and Technology Press, 2000 (in Chinese) [24] Kuo S. Phosphorus// Sparks DL, Page AL, Helmke PA, eds. Methods of Soil Analysis. Part 3: Chemical Methods. Madison, WI,USA: Soil Science Society of America, 1996: 869-919 [25] Tabatabai MA. Soil enzymes// Sparks DL, Page AL, Helmke PA, eds. Methods of Soil Analysis. Part 2: Microbiological and Biochemical Properties. Madison, WI,USA: Soil Science Society of America,1994: 775-834 [26] Tian D, Niu S. A global analysis of soil acidification caused by nitrogen addition. Environmental Research Letters, 2015, 10: 2, doi: 10.1088/1748-9326/10/2/024019 [27] Matschonat G, Matzner E. Soil chemical properties affecting NH4+ sorption in forest soils. Journal of Plant Nutrition and Soil Science, 2015, 159: 505-511 [28] Keeler BL, Hobbie SE, Kellogg LE. Effects of long-term nitrogen addition on microbial enzyme activity in eight forested and grassland sites: Implications for litter and soil organic matter decomposition. Ecosystems, 2009, 12: 1-15 [29] Ning Q-S (宁秋实). Effects of Nitrogen Addition on Soil Microbial Processes in Temperate Grassland in Inner Mongolia. PhD Thesis. Beijing: Chinese Academy of Sciences, 2016 (in Chinese) [30] Dick WA, Cheng L, Wang P. Soil acid and alkaline phosphatase activity as pH adjustment indicators. Soil Biology and Biochemistry, 2000, 32: 1915-1919 [31] Wang H (王 涵), Wang G (王 果), Huang Y-Y (黄颖颖), et al. The effects of pH change on the acti-vities of enzymes in acid soil. Ecology and Environment (生态环境学报), 2008, 17(6): 2401-2406 (in Chinese) [32] Simpson AJ, Simpson MJ, Smith E, et al. Microbially derived inputs to soil organic matter: Are current estimates too low? Environmental Science and Technology, 2007, 41: 8070-8076 [33] Geisseler D, Lazicki PA, Scow KM. Mineral nitrogen input decreases microbial biomass in soils under grasslands but not annual crops. Applied Soil Ecology, 2016, 106: 1-10 |