| 垂穗披碱草/星星草混播草地优化牦牛放牧强度的研究 |
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| 引用本文： | 董全民,赵新全,马有泉,马玉寿,施建军,孙小弟,盛丽,王彦龙,杨时海.垂穗披碱草/星星草混播草地优化牦牛放牧强度的研究[J].草业学报,2008,17(5):16-22. |
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| 作者姓名： | 董全民 赵新全 马有泉 马玉寿 施建军 孙小弟 盛丽 王彦龙 杨时海 |
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| 作者单位： | 青海省畜牧兽医科学院,青海,西宁,810016;中国科学院西北高原生物研究所,青海,西宁,810001 |
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| 基金项目： | 国家科技攻关项目，青海三江源自然保护区生态保护和建设总体规划科研课题及应用推广招标项目，国家科技支撑计划重大项目 |
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| 摘 要： | 以植被和牦牛生产力变化为目标研究草地不退化的最大放牧强度,在垂穗披碱草/星星草高寒混播草地3年的牦牛放牧试验结果表明,1)优良牧草比例和牦牛个体增重的平均年度变化随放牧强度的增加而减小,牦牛个体增重和优良牧草比例的平均年度变化之间存在着正相关,因此确立了不同放牧强度下优良牧草比例的年度变化是评价高寒混播群落放牧价值的直接度量指标.2)虽然群落相似性系数和草地质量指数可以评价草场的相对变化,但相似性系数的变化与牦牛个体生产力没有显著关系,因而不能反映草场放牧价值的变化,而计算草地质量指数时,不同植物类群盖度的测定和适口性的判别受人为因素的干扰较大,因此它也不是一个很客观的指标.3)当放牧强度为9.97头/hm2时,优良牧草比例和牦牛个体增重的年度变化能维持基本不变,因此,可以认为该放牧强度是高寒人工草地生长季放牧不退化的最大放牧强度.
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| 关 键 词： | 高寒混播草地 放牧强度 优良牧草比例 牦牛生产力 |
| 收稿时间： | 1900-01-01; |
A study on optimal grazing intensity for yak in Elymus natans/Puccinellia tenuflora mixed-sown undegraded grassland in the forage growing season based on vegetation and yak productivity |
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| DONG Quan-min,ZHAO Xin-quan,MA You-quan,MA Yu-shou,SHI Jian-jun,SUN Xiao-di,SHEN Li,WANG Yan-long,YANG Shi-hai.A study on optimal grazing intensity for yak in Elymus natans/Puccinellia tenuflora mixed-sown undegraded grassland in the forage growing season based on vegetation and yak productivity[J].Acta Prataculturae Sinica,2008,17(5):16-22. |
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| Authors: | DONG Quan-min ZHAO Xin-quan MA You-quan MA Yu-shou SHI Jian-jun SUN Xiao-di SHEN Li WANG Yan-long YANG Shi-hai |
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| Abstract: | A grazing trial of yaks for three grazing seasons in an Elymus natans/Puccinellia tenuflora mixed-sown grassland showed that: 1) The average annual changes for the ratio of good quality forage and live-weight gain per yak reduced with an increase of grazing intensity,and the average annual change of live-weight gain per yak was positively correlated with the average annual change of ratio for good quality forage.Therefore,the annual change for the ratio of good quality forage was established as a direct measuring index for evaluating grazing values under different grazing intensities in alpine mixed-sown grassland;2) Although a similarity index of community and grassland quality index could evaluate relative changes of grassland,there was no obvious relationship between change of similarity index and productivity per yak,so it did not reflect the change of grazing value.Moreover,when calculating grassland quality index,the measure of different plant groups and estimate of edibility were disturbed by artificial factors,thus it was not an external index;3) A grazing intensity of 9.97 head/hm2 could maintain the annual change of the ratio for good quality forage and live-weight gain per yak,and should be considered the maximum grazing intensity for undegraded alpine artificial communities in the plant growing seasons. |
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| Keywords: | alpine mixed-sown grassland grazing intensity the ratio of good quality forage yak productivity |
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