放牧强度对小叶章草甸植物生长和地上生物量的影响

在东北三江平原小叶章草甸,研究了不同放牧强度下小叶章、苣荬菜、小蓟、垂梗繁缕、蒲公英五个主要植物种群的生长以及地上生物量的季节动态。结果表明:小叶章、苣荬菜、小蓟随放牧强度增大生长速度减缓,中度放牧更能刺激垂梗繁缕的生长,放牧对蒲公英生长影响较小。地上总生物量高峰值在7月,最低值在9月,轻度放牧、中度放牧、重度放牧与不放牧比较,总生物量分别减少了26.85%、28.37%和44.64%。放牧对不同植物种群地上生物量的影响不一致。

Effect of Different Grazing Intensity on Plant Growth and Above-ground Biomass on Deyeuxia angustifolia Meadow in Sanjiang Plain

The growth and the seasonal changes of aboveground biomass of Deyeuxia angustifolia,Sonchus brachyotus,Cirsium setosum,Stellaria radians and Taraxacum officinale on Deyeuxia angustifolia meadow in Sanjiang Plain under different grazing intensity were studied.The results showed that the growth of Deyeuxia angustifolia,Sonchus brachyotus and Cirsium setosum were decreased with the grazing intensity increasing,the growth of Stellaria radians was stimulated under moderate grazing,and the influence of different grazing intensity on Taraxacum officinale was less.The total biomass was the maximal at July,and the lowest at September.The total biomass under light grazing,moderate grazing and heavy grazing was reduced by 26.85%,28.37% and 44.64% respectively compared with no grazing.There was non-uniformity influence of grazing on the aboveground biomass of different plant populations.