Yu Y W, Nan Z B, Matthew C.Population relationships of perennial ryegrass and white clover mixtures under differing grazing intensities .Agriculture, Ecosystems and Environment, 2008, 124:40-50.
[4]
Afzal M, Adams W A.Heterogeneity of soil mineral nitrogen in pasture grazed by cattle.Soil Science Society of America Journal, 1992, 56:1160-1166.
[5]
Williams P H, Haynes R J.Effect of sheep, deer and cattle dung on herbage production and soil nutrient content.Grass and Forage Science, 1995, 50:263-271.
[6]
Aarons S R, Hosseini H M, Dorling L, Gourley C J P.Dung decomposition in temperate dairy pastures II:Contribution to plant-available soil phosphorus.Australian Journal of Soil Research, 2004, 24:115-123
[7]
Powell J M, Ikpe F N, Somda Z C, Fernandez-Rivera S.Urine effects on soil chemical properties and the impact of urine and dung on pearl millet yield.Experimental Agriculture, 1998, 34:259-276.
[8]
鲁如坤.土壤农业化学分析方法.北京:中国农业科学技术出版社, 2000.
[9]
甘肃农业大学.草原生态化学实验指导书.北京:农业出版社, 1987.
[10]
Rohweder D A, Barnes R F, Jorgensen N.Proposed hay grading standards based on laboratory analyses for evaluating quality.Journal of Animal Science, 1978, 47(3):747-759.
[11]
卢德勋.乳牛营养工程技术及其应用.内蒙古畜牧科学, 2003(1):5-12.
[12]
Macdonald P, Edwards P A, Greenhoff J F D.动物营养学.赵义斌, 胡令浩, 译.兰州:甘肃民族出版社, 1992.
[13]
姜世成, 周道玮.牛粪堆积对草地影响的研究.草业学报, 2006, 15(4):1-3.
[14]
李辉霞, 王青, 陈国阶.高原牛粪:理想与生存的实证.生态经济, 2003(8):29-31.
[15]
Sakadevan K, Mackay A D, Hedley M J.Influence of sheep excreta on pasture uptake and leaching losses of sulfur, nitrogen and potassium from grazed pasturesAustralia Journal of Soil Research, 1993, 31:151-162.
[16]
Whitehead D C.Nutrient Elements in Grassland.Soil-Plant-Animal Relationships.Wallingford, UK:CAB International, 2000.
[17]
MacDiarmid B N, Watkin B R.The cattle dung patch 1.Effect of dung patches on yields and botanical composition of surrounding and underlying pasture.Journal of the British Grassland Society, 1971, 26:239-245.
[18]
Vinther F P.Biological nitrogen fixation in grass-clover affected by animal excreta.Plant and Soil, 1998, 203:207-215.
[19]
Forbes T D A, Hodgson J.The reaction of grazing sheep and cattle to the presence of dung from the same or the other species.Grass and Forage Science, 1985, 40:177-182.
[20]
Curll M L, Wilkins R J, Snaydon R W, Shanmugalingam V S.The effects of stocking rate and nitrogen fertifizer on a perennial ryegrass-white clover sward.1.Sward and sheep performance.Grass and Forage Science, 1985, 40:129-140.
[21]
Yu Y W, Fraser M D, Evans J G.Long-term effects on sward composition and animal performance of reducing fertilizer inputs to upland permanent pasture.Grass and Forage Science, 2011, 66:138-151.
[22]
MacDiarmid B N, Watkin B R.The cattle dung patch 3.Distribution and rate of decay of dung patches and their influence on grazing behaviour.Journal of the British Grassland Society, 1972, 27:48-54.
[23]
Hutchings M R, Gordon I J, Kyriazkis I, Jackson F.Sheep avoidance of faeces-contaminated patches leads to a trade-off between intake rate of forage and parasitism in subsequent foraging decisions.Animal Behaviour, 2001, 62:955-964.
Lin X W, Wang S P, Ma X Z, Xu G P, Luo C Y, Li Y N, Jiang G M, Xie Z B.Fluxes of CO2, CH4 and N2O in an alpine meadow affected by yak excreta during summer grazing periods on the Qinghai-Tibetan plateau.Soil Biology and Biochemistry, 2009, 41:718-725.