松嫩草原中度退化草地不同植被恢复方式下土壤螨类群落特征的差异

Difference in soil mite community characteristics among different vegetation restoration practices in the moderatly degraded pasture of Songnen grassland

应用类群数、个体密度、多样性指数和MI指数等多个群落参数,研究不同植被恢复方式下松嫩草原中度退化草地土壤螨类群落特征的差异。研究结果表明,与过度放牧样地相比,种植苜蓿和围栏封育样地的土壤环境相对优越,它们拥有较高的土壤螨类类群数、个体密度和群落多样性以及中气门螨类MI指数。在土壤螨类群落结构所有参数中,多样性指数(H′)和中气门螨类MI指数,种植苜蓿和围栏封育样地均明显高于过度放牧样地,这些差异反映了种植苜蓿和围栏封育对中度退化草地土壤螨类的群落结构具有明显改善作用。然而研究结果也显示,围栏封育样地土壤螨类群落多样性指数(H′)和中气门螨类MI指数尽管明显高于过度放牧样地,但是依然显著低于种植苜蓿样地,表明选择种植苜蓿较围栏封育可能更利于松嫩草原中度退化草地土壤螨类群落的恢复与重建。

Data on the soil mites living under different vegetation reclamation conditions in the moderately degraded grasslands were collected in Songnen between May to October in 2005. Community parametem such as generic richness, abundance, divemity index, and MI index were described, and community structure and its seasonal changes were studied. The results showed that planting alfalfa, and fencing enclosures, substantially improved soil mite communities after five yearn reclamation. Soil mite diversity and MI index were also significantly higher after planting alfalfa than after fencing enclosures. The results suggested that planting alfalfa may more favourably restore soil mite communities than fencing enclosures in the moderately degraded grasslands of Songnen .