Productivity and nutritive value of some cultivated perennial grasses and mixtures in the alpine region of the Tibetan Plateau
Productivity and nutritive value of some cultivated perennial grasses and mixtures in the alpine region of the Tibetan Plateau
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DOI：
10.1046/j.1365-2494.2003.00382.x
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发表时间：
2003-09-01
影响因子：
2.4
通讯作者：
Pu, XP
中科院分区：
文献类型：
--
作者：
Dong, SK;Long, RJ;Pu, XP
本文报道了几种多年生栽培禾本科牧草无芒雀麦（B）、西伯利亚雀麦（S）、欧洲雀麦（E.在青藏高原高寒地区，研究了垂穗冰草（N）、冰草（A）、喜冷早熟禾（P）及其混合物B + N、S + A、B + S + A、S + B + N、N + S + A、B + S + N + A、B + N + A + P、B + S +A + P和S + N + A + P的生长状况。E. nutans和E.结果表明，西伯利亚苜蓿和B + S + N + A、B + S +A + P和S + N + A + P的混合物产量最高，第二年干物质产量在11000 ~ 14000 kg（-1）之间。随着牧草成熟度的增加，酸性洗涤纤维（ADF）含量增加（P < 0.05），粗蛋白（CP）含量和可溶性DM降解率降低（P < 0.05）。基于这些物种和混合物的草地有可能成为青藏高原种植的主要选择，因为它们比其他草种和混合物产生更多的营养。8月下旬（优势牧草开花期）是最佳收获期，瘤胃可降解CP产量最高，DM产量相对较高，DM降解率较好。
The productivity and nutritive value of some cultivated perennial grasses, Bromus inermis (B), Elymus sibricus (S), E. nutans (N), Agropyron cristatum (A), Poa crymophila (P) and mixtures B + N, S + A, B + S + A, S + B + N, N + S + A, B + S + N + A, B + N + A + P, B + S +A + P and S + N + A + P, in the alpine region of the Tibetan Plateau were investigated. Elymus nutans and E. sibricus and the mixtures, B + S + N + A, B + S +A + P and S + N + A + P, were most productive with yields of dry matter (DM) of between 11 000 and 14 000 kg(-1) of biomass annually in the second harvest year. Acid-detergent fibre (ADF) concentrations increased (P < 0.05), and crude protein (CP) concentrations and in sacco DM degradability values decreased (P < 0.05) with the maturity of the cultivated grasses. Swards, based on these species and mixtures, have the potential to be the main choices for cultivation in the Tibetan Plateau because they produce more nutrients than other grass species and mixtures. Late August (flowering stage of dominant grasses) is the optimum time for harvesting as the yield of rumen-degradable CP is highest that of DM relatively high and the DM degradability is satisfactory.