牦牛放牧强度对高寒草甸暖季草场植被的影响
Effects of yaks stocking pates on aboveground and belowground biomass in kobrecia parva alpine meadow
查看参考文献18篇
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文摘
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暖季草场2年的放牧试验结果表明：随着放牧强度的提高，优良牧草盖度降低，杂草盖度增加，而且优良牧草盖度的年度变化与放牧强度呈极显著负相关，杂草盖度的年度变化与放牧强度呈极显著正相关；经过1年的放牧，不同放牧强度下植物群落发生了变化，进一步回归分析，相似性系数的年度变化与放牧强度呈极显著的负相关；地上生物量的变化基本呈“S”型变化，而且随着放牧强度的加重，地上生物量趋于减小，优良牧草的比例减少，杂草比例增加；优良牧草比例的年度变化与放牧强度呈极显著负相关，而杂草比例的年度变化与放牧强度呈极显著正相关。 |
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其他语种文摘
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Stocking rates of yaks had obvious effects on aboveground and belowground biomass in Ko-brecia parva alpine meadow. There was significant difference between biomass of grasses and sedges, total biomass and different stocking rates(P < 0. 05), and ratio of sedges and grasses decreased, ratio of palatable weeds and toxic weeds increased with the rise of stocking rates. The yearly changes of bi-omass composition for desirable herbage were negatively correlated with stocking rates(P < 0. 01), and the yearly changes of biomass composition for weeds were positively correlated with stocking rates (P<0. 01). The absolute growth ratio of aboveground biomass reached to the maximum in July in 1999? but in 1998? it reached to the maximum in cold-season pastureland in August, and as for warm-season pastureland, it reached to the maximum for control and light grazing in July, in August for moderate and heavy grazing. There was an obviously decreasing trend on the belowground biomass of every soil stratum with the increase of stocking rates. Belowground biomass of 0-10cm, 10-20cm and 20-30cm amounted to 88.04-89.37%, 7.14-9.34% and 2.25-3.5% of 0-30cm total below-ground biomass respectively in warm-season pastureland, and 88.01-91.14%, 5.44-8.04% and 3.42-3.94% in cold-season pastureland respectively. There were negative correlation relationships between aboveground biomass, belowground biomass for different soil stratums and stocking rates, and their linear regression equation as follows: Y = a - bx (b > O)It was a positive correlation relation-ship between aboveground biomass and belowground biomass, and regression equation as follows: Y = a + bx (b > 0). |
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来源
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草业科学
,2004,21(2):48-53 【扩展库】
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关键词
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放牧强度
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高寒草甸
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群落结构
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地上生物量及其组成
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地址
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1.
青海省畜牧兽医科学院, 青海, 西宁, 810003
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中国科学院西北高原生物研究所, 青海, 西宁, 810002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-0629 |
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学科
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畜牧、动物医学、狩猎、蚕、蜂 |
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基金
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青海省“九五”科技攻关项目
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文献收藏号
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CSCD:1359673
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