围栏封育对盐池荒漠草原植被群落特征的影响

通过对盐池县不同立地类型围栏内外封育3年的荒漠草原植被数量特征及多样性研究,结果表明:围栏后,荒漠草原草本植物密度围栏内比围栏外增加了2～10株/m2、盖度增加5%～38%。草原围栏内产草量比围栏外增加了560～2 077.7 kg/hm2,固定沙地白沙蒿的减少使得围栏外产草量比围栏内高594.8 kg/hm2;围栏封育后荒漠草地植物的群落结构发生了很大的改变,围封草地上的退化指示植物逐渐从群落中退出,多年生禾本科植物增加。植物群落Shannon-Wiener指数增加,Pielou、Partrick和Simpson指数都发生了变化,群落植被的丰富度得以改善,优势植物的优势地位也逐渐明显,而且植被分布也趋向均匀稳定。

Effects of Enclosure Fencing on the Vegetation Community Characteristics of Desert Steppe in Yanchi

Study on vegetation quantitative characteristics and diversity of desert steppe inside and outside enclosure fencing for 3 years of different site types in Yanchi was carried out.The results showed that the herbaceous density inside enclosure increased 2~10 plants / m2 and cover increased 5%~38% than outside of desert steppe after fencing.Grass production of steppe inside enclosure increased 560~2 077.7 kg/hm2 than outside fence,Grass production outside the fence was 594.8 kg/hm2 higher than that of inside the fence because of numbers of sphaerocephala decreased in fixed Saudi.There was a great change in plant community composition of fencing desert grassland,degradation indicator plants gradually exited from the communities in enclosed grassland,perennial grass plants increased.The Shannon-Wiener index increased of plant communities,the Pielou evenness,Partrick and Simpson index were also changed,the richness of the vegetation communities improved,the dominant position of the dominant plant species also became clear,and vegetation distribution tended to be more uniform and stable.