摘要
【目的】本文根据高寒沼泽草地牧草生长期营养成分变化,研究了高寒草泽草地牧草刈割时间和留茬高度对牧草品质及生物量的影响,为科学合理地利用高寒沼泽草地奠定理论基础。【方法】试验设计了刈割时间、留茬高度2种处理,每种处理3个水平,分析不同刈割时间和留茬高度处理对草地牧草产量及翌年再生量的影响。【结果】高寒沼泽草地牧草生长期营养含量随着生长月份增加差异显著(P<0.05)。7-8月正是牧草营养价值最高时期,粗蛋白(CP)含量较高,为12.14%～13.91%,体外干物质消化率(IVDMD)为68.05%～57.64%,是牧草刈割的最佳时期。随着牧草的生长,沼泽草地牧草的生物量逐渐增加,但10月底草地生物量有降低趋势(P<0.05)。9月底刈割草地牧草生物量最高(P<0.05),且与次年的刈割后草地生物量差异不显著(P>0.05)。次年8、10月刈割的牧草生物量有明显的减少,减产71.5和38.45 g/m^2,分别减产23.54%和12.15%。留茬高度越高,当年产草量越低(P<0.05)。牧草留茬为2 cm时,翌年产量减少48.29%。留茬高度4 cm,当年与翌年产草量相对较高,2016年比2015年增产9.18%。天然草地采用不同的刈割处理,以每年的8月底、留茬高度4 cm的生物量最高。【结论】综合牧草季节性营养物质总产量及传统放牧中沼泽草地作为冬季草场这2个因素考虑,我们认为,当雄县沼泽草地的最佳刈割期为8月底至9月初、留茬高度4 cm时天然草地鲜草产量及质量最佳。
Science Research, TAAAS, Tibet Lhasa 850000, China）Abstract：【Objective】According to forage nutritional components change during growth period at alpine wetlands, we conducted study focusing on impact of mowing time and stubble height of alpine wetlands on forage yield,which lay a theoritical base for utilizing resource of alpine wetlands scientifically and rationally. 【Method】 Experiment designed 2 treatments ： mowing time and stubble height, and each treatment had 3 levels. We analyzed impact of different mowing time and stubble height on forage yield in next year. 【Result】 Forage nutritioncontent of alpine wetlands increased significantly with growing months（P 〈 0. 05）. Forage nutrition reached the top during August, crudeprotein（CP） content was relatively high,which was between 12. 14 % - 13. 91 % and in vitro dry matter digestibility （ IVDMD） was between 68. 05 % - 57. 64 %, suggesting that this time was the best cutting period. With forage growth in alpine wetland, the growth trend offorage yield turned over in late October. The forage yield was significantly the highest（P 〈 0. 05）in late September,which did not vary significantly （P 〈 0. 05）with that in the same period of next year. The cutting forage yields indicated a significant decline（P 〈 0. 05）in Augustand October next year, whose yield reduction was 71. 5 g / m^2（23. 54 %）and 38. 45 g / m^2（12. 15 %）, respectively. Current year yield decreased with stubble height increasing. Next year yield reduced48. 29 % when stubble height was 2 cm. Forage yield in currentand next year was relatively high when stubble height was 4 cm. Forage yield in 2016 increased by 9. 18 % compared withyield in 2015. Different cutting treatments of nature grasslandwas optimized at 4 cm of stubble height in late August in termsof the yield. 【 Conclusion】 Considering that forage nutritional production and wetland were regraded as winter pasture in traditional grazing system,we concluded that the optimal cutting period
作者
参木友
顿珠加才
鲍宇红
廖阳慈
曲广鹏
普布次仁
CAN Mu-you;DunzhuJiacai;BAO Yu-hong;LIAO Yang-ci;QU Guang-peng;Pubuciren(Barley Improvement and Yak Breeding Key Laboratory of Tibet Autonomous Region,Tibet Lhasa 85000,China;Institute of GrasslandScience Research,TAAAS,Tibet Lhasa 850000,China)
出处
《西藏农业科技》
2018年第3期1-4,共4页
Tibet Journal of Agricultural Sciences
基金
国家肉牛牦牛产业技术体系专项资金(CARS-37)
十二五国家科技支撑项目"西藏牧区‘生产生态生活’保障技术集成与示范"(2012BAD13B04)资助
