Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau

NWIPB OpenIR

	Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau
	Dong, SK ; Long, RJ ; Hu, ZZ ; Ding, LM ; Xu, MY
	2003-09-01
发表期刊	NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH ; Dong, SK, Long, RJ, Hu, ZZ, Ding, LM, Xu, MY. Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau. NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH,2003,46(3):175-183
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.; 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.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/45801
专题	中国科学院西北高原生物研究所
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, Dong, SK, Long, RJ, Hu, ZZ, Ding, LM, Xu, MY. Influence of grazing intensity on performance of perennial grass mixtures in the alpine region of the Tibetan Plateau. NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH,2003,46(3):175-183,2003.
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.
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 (2003).