刈割时间与留茬高度对羊草草甸草产量和品质的影响

Effects of cutting time and stubble height on hay yield and quality of Leymus chinensis meadow

为揭示刈割时间与留茬高度对羊草（Leymus chinensis）草甸草产量和干草品质的影响,确定适宜刈割时间与合理留茬高度,本研究以吉林省大安市姜家甸羊草草甸为研究对象,于2014年通过刈割时间与留茬高度两个因素,各设3水平进行随机区组试验研究。结果表明,在8月1日至9月1日间,随刈割时间的推迟,群落盖度呈明显的递增趋势（P〈0.05）,群落和羊草干草粗蛋白（CP）含量呈显著的下降趋势（P〈0.05）,0-10、10-20和20-30 cm三个土层深度的群落根系生物量呈现出由增到减的变化过程,而羊草根系生物量在10-20 cm土层呈减少。8月15日刈割,群落和羊草产量均最高;留茬高度8 cm处理群落产量最高,留茬高度2cm处理羊草产量最高,但在2~8 cm留茬高度范围内,群落和羊草营养成分含量均无显著变化。吉林省西部羊草草甸8月15日刈割、留茬高度2 cm,可收获当年最高羊草产量和干草品质。

The effects of different cutting time and stubble height on hay yield and quality of Leymus chinensis meadow in the western of Jilin Province were studied during the period of August 1 to September 1 in 2014. The results showed that with the delay of cutting time, the coverage of community significantly increased （P〈 0.05）, while the crude protein（CP） content of both community and L. chinensis significantly decreased, the change of root biomass of community in the soil depth of 0- 10, 10- 20 and 20- 30 cm the presented the process of increasing to decreasing, while the change of rhizome biomass of L. chinensis in 10-20 cm soil depth presented the process of decreasing. The hay yield of both community and L. chinensis were the highest when cutting time was August 15. The hay yield of community was the highest in stubble height of 8 cm, and that of L. chinensis was the highest in stubble height of 2 era. The nutrient content of community and L. chinensis did not significantly change in stubble height of 2～8 cm. The highest yield and fine forage quality were achived when the cutting time was August 15 and stubble height at 2 cm in L. chinensis meadow in the western of Jilin Province.