Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau
文献类型：期刊论文
| 作者 | Dong, SK; Long, RJ; Hu, ZZ; Ding, LM; Xu, MY |
| 刊名 | new zealand journal of agricultural research
 |
| 出版日期 | 2003-09-01 |
| 卷号 | 46期号:3页码:175-183 |
| 关键词 | improved pastures yields leaf characteristics herbage DM yield species composition |
| 合作状况 | 其它 |
| 中文摘要 | effects of grazing intensity on leaf photosynthetic rate (pn), specific leaf area (sla), individual tiller density, sward leaf area index (lai), harvested herbage dm, and species composition in grass mixtures (clinelymus nutans + bromus inermis, elymus nutans + bromus inermis + agropyron cristatum and elymus nutans + clinelymus nutans + bromus inermis + agropyron cristatum) were studied in the alpine region of the tibetan plateau. four grazing intensities (gi), expressed as feed utilisation rates (ur) by tibetan lambs were imposed as follows: (1) no grazing; (2) 30% ur as light grazing; (3) 50% ur as medium grazing; and (4) 70% ur as high grazing. leaf pn rate and tiller density of grasses increased (p < 0.05), while sward lai and harvested herbage dm declined (p < 0.05) with the increments of gi, although no effect of gi on sla was observed. with increasing gi, elymus nutans and clinelymus nutans increased but bromus inermis and agropyron cristatum decreased in swards, lai and dm contribution. whether being grazed or not, elymus nutans + clinelymus nutans + bromus inermis + agropyron cristatum was the most productive sward among the grass mixtures. thus, two well-performed grass species (elymus nutans and clinelymus nutans) and the most productive mixture of four species should be investigated further as the new feed resources in the alpine grazing system of the tibetan plateau. light grazing intensity of 30% ur was recommended for these grass mixtures when swards, lai, herbage dm harvested, and species compatibility were taken into account. |
| 英文摘要 | effects of grazing intensity on leaf photosynthetic rate (pn), specific leaf area (sla), individual tiller density, sward leaf area index (lai), harvested herbage dm, and species composition in grass mixtures (clinelymus nutans + bromus inermis, elymus nutans + bromus inermis + agropyron cristatum and elymus nutans + clinelymus nutans + bromus inermis + agropyron cristatum) were studied in the alpine region of the tibetan plateau. four grazing intensities (gi), expressed as feed utilisation rates (ur) by tibetan lambs were imposed as follows: (1) no grazing; (2) 30% ur as light grazing; (3) 50% ur as medium grazing; and (4) 70% ur as high grazing. leaf pn rate and tiller density of grasses increased (p < 0.05), while sward lai and harvested herbage dm declined (p < 0.05) with the increments of gi, although no effect of gi on sla was observed. with increasing gi, elymus nutans and clinelymus nutans increased but bromus inermis and agropyron cristatum decreased in swards, lai and dm contribution. whether being grazed or not, elymus nutans + clinelymus nutans + bromus inermis + agropyron cristatum was the most productive sward among the grass mixtures. thus, two well-performed grass species (elymus nutans and clinelymus nutans) and the most productive mixture of four species should be investigated further as the new feed resources in the alpine grazing system of the tibetan plateau. light grazing intensity of 30% ur was recommended for these grass mixtures when swards, lai, herbage dm harvested, and species compatibility were taken into account. |
| WOS标题词 | science & technology ; life sciences & biomedicine |
| 学科主题 | 农业科学 |
| 类目[WOS] | agriculture, multidisciplinary |
| 研究领域[WOS] | agriculture |
| 关键词[WOS] | subtropical conditions ; competition ; frequency ; regrowth ; prairie ; tillers |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000186252800002 |
| 公开日期 | 2009-12-10 |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/1406]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 作者单位 | 1.Beijing Normal Univ, Inst Environm Sci, State Joint Key Lab Environm Simulat & Pollut Con, Beijing 100875, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Xinjing 810001, Peoples R China 3.Gansu Agr Univ, Grassland Sci Coll, Lanzhou 730070, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, SK,Long, RJ,Hu, ZZ,et al. Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau[J]. new zealand journal of agricultural research,2003,46(3):175-183. |
| APA | Dong, SK,Long, RJ,Hu, ZZ,Ding, LM,&Xu, MY.(2003).Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau.new zealand journal of agricultural research,46(3),175-183. |
| MLA | Dong, SK,et al."Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau".new zealand journal of agricultural research 46.3(2003):175-183. |
入库方式： OAI收割
来源：西北高原生物研究所
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