苇状羊茅人工草地节肢动物群落结构的时序动态

Time Dynamic of Arthropod Community in Structure Artificial Tall Fescue Grassland

通过对苇状羊茅人工草地节肢动物群落的系统调查,分析了苇状羊茅人工草地节肢动物群落及各亚群落结构的时序动态。结果表明,非天敌亚群落的物种数、个体数量、优势集中性、多样性H'、均匀性、优势度和物种丰富度随时间的变化趋势与总群落一致。天敌亚群落均匀性除9月外,多表现为均匀性高于总群落及非天敌亚群落;天敌亚群落优势度在4月中旬至6月上旬均低于总群落及非天敌亚群落,而在9月居高。物种数丰富度天敌亚群落波动不大,总群落和非天敌亚群落出现低→高→低趋势,非天敌亚群落物种丰富度和天敌亚群落表现为交替变化。

The results from analyzing time dynamic of arthropod community and sub-community in artificial tall fescue grassland based on the systematic investigation showed that the variation trend of species number, individual quantity, dominant concentration, diversity index H＇, evenness, dominance and species richness of sub-communities with non-natural enemy varied with the time sequence and its variation trend accorded with that of total community. The evenness of sub-community with natural enemy was higher than that of total community and the sub-community with non-natural enemy except September. The dominant concentration of the community with natural enemy was lower than that of total community and sub-community with non-natural enemy from the middle ten-day period of April to the first ten-day period of June, but the dominant concentration of the community with natural enemy was higher than that of total community and sub-community with non-natural enemy in September. The species richness of the sub-community with natural enemy was a little fluctuation whereas the species richness of total community and sub-community with non-natural enemy presented the trend from low to high to low. There was alternative change in species richness between the sub-community with non-natural enemy and the subcommunity with natural enemy.