刈割时间和留茬高度对大针茅产草量和营养品质的影响

Effects of stubble height and mowing date on the forage yield and nutritional quality of Stipagrandis

为研究刈割对典型草原建群植物大针茅产草量和营养品质的影响,通过随机区组实验,在测定大针茅性状(生殖高度、营养枝高度、产量)和种群营养物质含量(粗蛋白含量、酸性洗涤纤维含量、中性洗涤纤维含量)基础上,对不同留茬高度和刈割时间下大针茅产草量和营养品质的变化进行研究。结果表明:刈割显著降低大针茅产草量,在各刈割处理中,大针茅在中度刈割时产量最高;刈割显著增高大针茅粗蛋白,中低留茬大针茅品质较好;随刈割时间推后,大针茅产草量显著上升,但大针茅粗蛋白显著下降;建议大针茅8月中旬刈割,留茬5cm。

In order to study the effect of mowing on the forage yield and nutritional quality of S.grandis,the characters of S.grandis（reproductive height and nutrition height,forage yield）and nutrient content（crude protein content,acid detergent fiber content and neutral detergent fiber content）were determined.The above data were used to study the effect of stubble height and cutting time on the forage yield and nutritional quality of S.grandis.The results showed that mowing significantly reduced the forage yield of S.grandis,and the highest forage yield of S.grandis in moderate mowing.The mowing Significantly increased the content of crude protein in S.grandis,good quality of the middle and low stubble of S.grandis,with the mowing time postponed,the production of S.grandis significantly increased,but the crude protein of S.grandis significantly decreased;it is suggested that mowing and 5 cm stubble of S.grandis in the middle of August