青藏高原地区不同垂穗披碱草居群营养品质研究

A study on forage nutritional quality of Elymus nutans from different populations in the Qinghai-Tibet Plateau

为探讨不同垂穗披碱草居群产量和营养品质状况,本研究分析评价了45个垂穗披碱草居群的产量性状和粗蛋白质(CP)、可溶性糖(WSC)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)4个品质性状。结果显示,居群间产量、CP、WSC、NDF和ADF含量存在极显著差异,45个垂穗披碱草居群的产量性状和品质性状近似正态分布,其变化范围为2 062.59～18 597.73kg/hm2(鲜草产量),529.42～4 682.60kg/hm2(干草产量),13.88%～23.92%(CP),1.59%～6.03%(WSC),57.34%～64.97%(NDF)和35.06%～47.23%(ADF)。各性状变异程度不同,产量性状变异均达62%以上,品质性状中WSC变异系数最大,达31.19%。相关分析表明,CP与NDF和ADF含量呈极显著负相关,ADF与NDF含量呈显著正相关,WSC含量与NDF含量呈极显著正相关,与产量和ADF呈显著负相关。根据各性状的相关关系,筛选出5个CP和WSC含量高而NDF和ADF含量低的垂穗披碱草居群。

To study forage nutritional quality of Elymus nutans from different populations in the Qinghai-Tibet Plateau,production traits,crude protein（CP）,water soluble carbohydrate（WSC）,neutral detergent fiber（NDF） and acid detergent fiber（ADF） of 45 E.nutans populations were investigated.There were significant differences in yield,CP,WSC,NDF and ADF between populations,and the four parameters were reccorded with an almost normal distribution.Fresh grass yield was 2 062.59-18 597.73 kg/h^m2,dry grass yield was 529.42-4 682.60 kg/h^m2,CP was 13.88%-23.92%,WSC was 1.59%-6.03%,NDF was 57.34%-64.97% and ADF was 35.06%-47.23%.Coefficients of variation of yields were all over 62% and that of WSC was 31.19%.There were significant negative correlations between CP and both NDF and ADF,significant positive correlations between NDF and ADF,and significant negative correlations between WSC and NDF,and between yields and ADF.Based on these correlations,five E.nutans populations with high CP and WSC but low NDF and ADF were selected for future work.