刈割条件下松嫩平原碱化羊草草地土壤螨类群落变化特征的研究

EFFECTS OF MOWING PRACTICES ON SOIL MITE COMMUNITY IN ALKALINIZED GRASSLAND OF LEYMUS CHINENSIS IN SONGNEN PLAIN

应用类群属数、个体密度、多样性指数和MI指数等多个群落参数,研究刈割活动对松嫩平原碱化羊草草地土壤螨类群落特征的影响。本研究共捕获土壤螨类1 515只,分别隶属于3亚目61属。研究结果表明,刈割活动影响土壤螨类群落组成,其中主要是减少了隐气门亚目的个体数量;与围栏封育相比,刈割活动样地土壤螨类个体密度、群落多样性H′指数和丰富度SR指数显著下降,刈割活动明显降低土壤螨类群落结构的复杂程度和稳定性;土壤中气门亚目螨类群落结构样地间相比,刈割活动样地MI指数也显著减少,刈割活动限制了土壤捕食性螨类k选择类群比例的增长;此外,土壤甲螨群落MGP分析表明,两类处理样地间甲螨结构同样存在差异,其中刈割活动明显影响大孔低等甲螨的存在。

Effects of mowing practices on soil mite community in alkalinized grassland of leymus chinensis in the Songncn Plain were studied from May to October in 2005 ,with reference to community paraments such as generic richness, abundance,biodiversity, MI （ Mesostigmata）, and MGP （Oribatid）. A total of 1515 soil mite individuals was collected, belonging to 3 sub-orders,61 genera. The results indicated that the number of soil mite individuals was significantly lower in Treatment MP （Mowing Practice） than in Treatment FE （Fencing enclosure） , and the difference in diversity （H＇ index and SR index） between MP and FE were also significant. The results also suggested that MP mainly decreased the proportion of k-selection groups of soil mites （Mesostigmata） and obviously affected living of Macropyline group （Oribatid）.