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生态学杂志 ›› 2010, Vol. 29 ›› Issue (05): 862-868.

• 研究报告 • 上一篇    下一篇

放牧强度对草甸草原生产力和多样性的影响

王明君1;韩国栋2**;崔国文1;赵萌莉2   

  1. 1东北农业大学,哈尔滨 150030;2内蒙古农业大学,呼和浩特 010018
  • 出版日期:2010-05-10 发布日期:2010-05-10

Effects of grazing intensity on the biodiversity and productivity of meadow steppe.

WANG Ming-jun1;HAN Guo-dong2;CUI Guo-wen1;ZHAO Meng-li2   

  1. 1Northeast Agricultural University, Harbin 150030, China;2Inner Mongolia Agricultural University, Hohhot 010018, China
  • Online:2010-05-10 Published:2010-05-10

摘要: 采用比较样地法研究了不同放牧强度对羊草草甸草原群落多样性和生产力的影响。结果表明:α多样性指数随放牧强度的增加表现为先增加后降低的趋势,其值在轻度放牧区最大,支持了“中度干扰理论”;β多样性指数随放牧强度的增加而变大;不同放牧强度的草地植物种类相似性变差、草地地上净初级生产力与Alatalo均匀度指数具有显著的线性相关性(P<0.05);放牧和气候对草地地上净初级生产力均有较大的影响,但二者的互作效应不显著(P>0.05);不放牧不能持续维持草地的健康状况,但健康的草地状况可以有效地缓冲放牧和气候干扰,并能够维持较高的草地生产力和生物多样性。

关键词: 胶体矿物, 吸附, 乙酸, 酸性磷酸酶

Abstract: A series of comparative sampling plots were selected to study the effects of different grazing intensities on the biodiversity and productivity of a  Leymus chinensis meadow steppe in Inner Mongolia. It was shown that with the increase of grazing intensity, α diversity index decreased after an initial increase, and had the highest value in light grazing areas, which supported the ‘medium disturbance theory’, while β diversity index had an increasing trend. Lesser similarity of plant species was observed under different grazing intensities. There was a significant linear relationship between aboveground net primary productivity (ANPP) and Alatalo evenness index (P<0.05). Grazing and climate had larger effects on the ANPP, but their interactive effect was not significant. No grazing could not maintain grassland health, but healthy grassland could effectively buffer the disturbances of grazing and climate, and maintain its higher productivity and biodiversity.

Key words: Colloid minerals, Adsorption, Acetic acid, Acid phosphatase