赤峰巴林左旗典型草原针茅属牧草最适收获期研究

Balin left banner in Chifeng optimum harvest time of Stipa grandis in typical steppe

摘要:

通过研究不同收获期针茅属牧草营养物动态的变化，为针茅属牧草适时收获提供理论参考。 试验以赤峰巴林左旗典型草原针茅(Stipa grandis)为原料，通过研究不同收获期对针茅属牧草营养含量变化的影响，利用最优母序列分析不同收获期的综合指标，筛选赤峰巴林左旗针茅属牧草的最适收获期。结果显示：相比其他收获时间，8 月 20 日收获针茅属牧草的粗蛋白质和可溶性碳水化合物含量最高，粗蛋白含量为 6. 36 %，可溶性糖含量为 4. 06%，高于其他收获期，中性洗涤纤维和酸性洗涤纤维含量适中，8 月 20 日与针茅属牧草营养价值关联度最大，为 0. 96。综合分析后发现，8 月 20 日为巴林左旗典型草原针茅属牧草的适宜收获期，此时针茅属牧草含有较高的营养价值。

Abstract:

This study investigated the dynamic changes of nutrients of Stipa grandis at different growth stages to provide a theoretical reference for the timely harvest of Stipa grandis. In this study，S. grandis was used as raw mate- rial which was collected from the typical steppe in Chifeng. The effects of harvest dates on the nutritional content of Stipa grandis were studied. The optimal mother sequence was used to analyze the comprehensive indexes of different harvest dates，and the optimal harvest dates were selected. The results showed as follows： compared with other har- vest times，with the harvest time on August 20，the crude protein and water soluble carbohydrates contents of S. gran- dis harvested were the highest and crude protein content was 6. 36 % DM，the water soluble carbohydrates content was 4. 06 % DM，which was higher than that of other harvest times. The content of neutral detergent fiber and acid detergent fiber was moderate. Based on comprehensive analysis，August 20 was the most suitable harvest time of S. grandis which had high nutritional value in the typical steppe of Balin Left Banner.