阿拉善荒漠草地8种牧草营养物质季节动态及营养均衡价评价

探讨了阿拉善荒漠草地珍珠柴(Salsola passerina)、霸王(Zygophyllum xanthoxylon)、红砂(Reaumuria soon-gorica)、绵刺(Potaninia mongolica)、梭梭(Haloxylon ammodendron)、盐爪爪(Kalidium foliatum)、沙鞭(Psammochloavillosa)和牛心朴子(Cynanchum komarovii)8种牧草营养物质含量的季节动态,并以粗蛋白质对其营养均衡价进行了比较。结果表明:8种牧草的粗蛋白质、粗脂肪、无氮浸出物、钙含量和钙磷比随着牧草的生长期呈先增加后降低的趋势,粗蛋白质含量6月最高,为7.86%~19.18%,1月最低,为5.25%~9.24%;粗脂肪、无氮浸出物、钙含量及钙磷比分别为0.81%~9.63%,26.19%~52.58%,0.12%~1.93%和0.86%~16.00%。粗纤维含量随植物生长呈降低趋势,且8种牧草的含量差异性较大,范围为9.56%~43.01%;粗灰分含量随生长期没有明显的季节动态规律;磷含量随牧草的生长而降低,范围0.04%~0.20%。牧草营养均衡价的评价表明:8种牧草营养均衡价(NB)依次为:梭梭绵刺珍珠柴霸王红砂盐爪爪牛心朴子沙鞭。

The Seasonal Dynamics of Nutrient Contents and the Nutrition Balanced Values in the Eight Forage Species in the Alxa Desert Grassland

The seasonal dynamics of nutrient contents and the nutrition balanced values(NB)with crude protein (CP)as the evaluative criterion in S.passerine,Z.xanthoxylon,R.soongrica,P.mongolica,H ammodendron,K. foliatum,P.villosa and C.komarovii in the Alxa desea grassland were investigated.The results showed that the contents of crude protein(CP),crude fat(EE),calcium(Ca),nitrogen free extract(NFE)and Ca/P in the eight forages increased firstly,and then decreased;the contents of CP reached the highest value in June with the content range of 7.86%～19.18%,and reached the smallest value in January with the content range of 5.25%～9.24%:The content range of EE,NFE,Ca and Ca/P were 0.81%～9.63%,26.19%～52.58%,0.12%～1.93%and 0.86～16.00,respectively.By contrast,the crude fibre(CF)decreased as the plant grew and had a significant difference in eight forages,the content range was 9.56%～43.01%.The contents of crude ash(Ash)showed no significant changes.The phosphorus(P)content decreased as the plant grew,the content range was 0.04%～0.20%.The NB of the eight forges followed the order of:H ammodendron>P.mongolica>Z.xanthoxylon>R.soongrica>K.foliatum>C.komarovii>P.villosa.