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施肥梯度对甘南高寒草甸植被特征的影响 被引量:43

The effect of fertilizer gradients on vegetation characteristics in alpine meadow
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摘要 通过小区控制施肥实验,研究了施肥梯度对青藏高原东缘高寒草甸植被特征的影响.结果表明,1) 施肥使线叶嵩草、波伐早熟禾、垂穗鹅观草等禾草的高度显著增加,异针茅、瑞玲草等非禾草类的高度减少.2) 随着施肥梯度的增大,群落的总密度逐渐下降, 禾草密度在不同施肥梯度下有时增加,有时减少,无一般性规律;而非禾草物种密度一般是减少的.3) 随施肥梯度的增加,地上生物量明显提高,多样性指数逐渐下降.施肥对群落密度、地上生物量和多样性的作用都要在2年以后才表现出明显的规律. The effect of fertilizer gradients on vegetation character in alpine meadow was studied by fertilizing experiment. The results showed :1) Height of the herbage such as Kobresia capillifolia,Poa poophagorum,Roegneria nutans, et al.increased significantly along the fertilizer gradient,but the height of Stipa aliena and Saussurea nigrescens decreased significantly. 2) Community density decreased along the fertilizer gradient. Changes of the herbage density were different along the fertilizer gradient; other plant populations density commonly decreased. 3) Plant aboveground biomass increased significantly,but species diversity decreased along fertilizing gradient. Effect of the fertilizing on community density,productivity and species diversity represented distinctly only after two years.
作者 邱波 罗燕江 杜国祯 QIU Bo,LUO Yan-jiang,DU Guo-zhen(1.Laboratory of Arid Agroecology,Lanzhou University,Lanzhou 730000,China; 2.Hunan Provincial Environmental Protection Scientific Research Institute,Changsha 410004,China)
出处 《草业学报》 CSCD 2004年第6期 65-68,共4页 Acta Prataculturae Sinica
基金 国家自然科学基金,甘肃省科技攻关项目
关键词 高寒草甸 施肥梯度 植被特征 alpine meadow fertilizer gradient vegetation characteristic
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参考文献3

  • 1Bakelaar R G,Eugene O P. Community and population level responses to fertilization in an old-field ecosystem[J]. Ecology, 1978,59(4):660-665. 被引量:1
  • 2Bryan L F,Katherine L. Gross species richness in a successional grassland:Effects of nitrogen enrichment and plant litter[J]. Ecology, 1998,79(8):2593-2602. 被引量:1
  • 3Rajaniemi T K. Why does fertilization reduce plant species diversity? Testing three competition-based hypotheses [J]. Journal of Ecology, 2002,90,316-324. 被引量:1

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