施用氮素对高寒地区混播人工草地的影响

Effects of Nitrogen on Cultivated Grassland in Alpine Region

【目的】研究施用氮素对高寒地区混播人工草地生产性能的影响,为在同类地区建立高产人工草地提供理论和实践依据。【方法】以昭苏马场前山丘陵地带建植第二年的人工草地为对象,通过测定不同施肥梯度条件下的牧草产量、物种丰富度、营养成分等,确定最佳的氮素使用量。【结果】最佳的施肥量为7.5 g/m^2;最佳的割草时期为盛花期,即7月底至8月初,此时能够得到最高产量,为4 997.21 kg/hm^2。【结论】施用氮素能够大幅增加单位面积牧草产量,并保证牧草的营养成分不受影响。

[ Objective ] This research studied the effects of nitrogen on the productivity of cultivated grassland in an alpine region, and the conclusion will helpful for the study of cultivated grassland. [ Method ] The cultivated grassland in the hills of Zhaosu Horse Farm of Yili was studied in this research. There were different usage amounts of urea on different soils. Outputs, different kinds of weeds and percents of nutriment of them were compared in this research as well, and then the best usage amount of urea was obtained. [ Result]The best usage amount of urea is 7.5 g/m2, and the best time of harvest is at autumn, between the last days in July and the earliest days in August. Following what is said above, the most output can be obtained, that is 4 997.21 kg/hm2. [ Conclusion ] Using nitrogen in soil can increase the outputs of the cultivated grassland, and can insure the quality of pastures out of affection.