刈割对大针茅草原产量和牧草营养品质的影响

Effects of Cutting Regime on Yield and Nutritional Value of Stipagrandis Steppe

刈割是大针茅草原的利用方式之一,为揭示刈割对大针茅草原的影响,确定适宜刈割时间与刈割强度,以内蒙古锡林郭勒盟大针茅草原为研究对象,通过不同留茬高度和刈割时间(8月1日、8月16日、8月31日)双因素随机区组实验,分析了刈割对大针茅草原产量和营养品质的影响。结果表明:刈割显著降低牧草产量,中重度刈割牧草营养品质显著增高。随刈割时间延后,牧草产量增加,但牧草品质下降。综合产量和牧草品质,大针茅草原以8月中旬刈割,留茬5cm为宜。

Cutting is one of the utilization methods of Stipagrandis steppe.The major objectives of the present study were to(i)evaluate the effect of cutting regime on Stipagrandis steppe and(ii)determine the appropriate cutting time and cutting intensity.An experiment was conducted on the Stipasteppe of Xilin gol League in Inner Mongolia.The research was arranged in a completely randomized design with different stubble heights and cutting time(Aug 1,Aug 16 and Aug 31),the yield and nutritional value of Stipagrandis were analyzed.The results showed that the cutting significantly reduced the forage yield,and moderate and heavy cutting significant increased the nutritional value of the forage.With the delay of cutting time,the forage yield increased,but the forage quality decreased.For comprehensive yield and forage quality,it was suggested that the best cutting regime for Stipasteppe was to cutting in mid-August with a stubble height of 5cm.