摘要
放牧干扰是草地植物群落结构和植物多样性变化的主要影响因素之一,本研究讨论了不同放牧强度对伊犁绢蒿(Seriphidium transiliense)群落结构的影响。试验在昌吉市阿什里乡的阿苇滩春秋草地上开展,比较了对照(CK)、轻牧(LG)、中牧(MG)和重牧(HG)4个梯度的伊犁绢蒿群落。结果表明,随着放牧强度的增强,群落的物种数增强,但重要值(IV)呈下降趋势。α多样性指数表明,MG组的Shannon-Wiener指数(H)和Simpson指数(D)较大,呈现MG>HG>LG>CK的规律;群落物种的均匀度指数(J)、丰富度指数(R)均呈现HG>MG>LG>CK的规律,支持中度干扰假说。由此可知,放牧对草地植被结构有着重要影响,适度放牧有利于草地植被结构的改善,增加其物种多样性。
The grazing disturbance is one of the main influence factors on grassland community structure.The effects of different grazing intensities on the Seriphidum transiliense community structure were stud- ied in the present research. The community structures of S. transiliense were analyzed within four grazing intensities, including zero grazing （CK）, light grazing （LG）, medium grazing （MG） and high grazing （HO） in Ashili Village, Changji City. The results showed that species number of community increased and the import value （IV） decreased with the grazing intensities increasing, a diversity index presented that the Shannon-Wiener index （H） and the Simpson index （D） was higher with medium grazing （MG） which showed the trend at MG^HG^LG^CK. Both evennss index （J） and richness index （R） of community species showed the trend with HG^MG^LG〉CK. All of these results supported the intermediate dis- turbance hypothesis and indicated that grazing have important effects on grassland vegetation structure. It is concluded that moderate grazing appears to be suitable for improvement of grassland regulation structure and species diversity.
出处
《草业科学》
CAS
CSCD
北大核心
2013年第12期2047-2053,共7页
Pratacultural Science
基金
国家自然基金项目(31160477
31260574)
关键词
放牧干扰
伊犁绢蒿
群落结构
grazing disturbance Seriphidum transiliense community structure
