Response of soil mites to organic cultivation in an ultisol in southeast Brazil
Response of soil mites to organic cultivation in an ultisol in southeast Brazil
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DOI：
10.1007/s10493-004-0201-y
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发表时间：
2004-01-01
影响因子：
2.2
通讯作者：
Correia, MEF
中科院分区：
文献类型：
--
作者：
Badejo, MA;De Aquino, AM;Correia, MEF
于1998年4月、12月和1999年12月对4个有机管理小区的土壤螨类进行了调查。将它们的种群与附近牧场和森林中的螨类种群进行了比较。据观察，无论以前的有机投入如何，只要一块地块被开辟和机械干扰以准备耕作，土壤螨类的数量和表层形态的活动总是会最初减少。随着时间的推移，在有机管理下，螨类的密度和活动都会恢复。与革马斯虫和放线螨类相比，尿足类和甲形螨类从有机管理中受益更多。在有新鲜牛粪的香蕉下，尿样螨类大量增加。在土壤湿润、温度较低的有机地块中，甲螨种类以诺氏甲螨和古甲螨为主。在土壤较干燥、温度高于环境的有机地块中，原生生物占主导地位。Galumna是所有样地中最活跃的甲壳虫分类群，在maracuja和牧场样地中记录到的活动最高。结果表明，随着有机田土壤螨类密度和活动的增加，甲螨的群落结构和补充期也发生了变化。有机样地甲螨多样性高于牧场，但低于森林，Belba sp.在有机小区和牧场中，出现了许多Eemobelboid短柄线虫属，但没有。
Soil-dwelling mites of four plots under organic management were investigated in April and December 1998 and in December 1999. Their populations were compared with mite populations in a pasture and forest in the vicinity. It was observed that there was always an initial reduction in the populations of soil mites and in the activity of the epigeic forms whenever a plot was opened up and disturbed mechanically in preparation for cultivation, irrespective of previous organic inputs. With time, the densities and activities of mites recovered under organic management. The uropodine and oribatid mites in particular benefited more from organic management than gamasine and actinedid mites. Uropodine mites increased tremendously under banana where there was fresh cow dung manure. Oribatid mite species Nothrus seropedicalensis and Archegozetes magnus were dominant in organic plots where the soil was moist and temperatures were lower than the ambient. Protoribates rioensis was dominant in organic plots where the soil was drier and temperatures were higher than the ambient. Galumna was the most active oribatid taxon on the floor of all plots, with the highest activity recorded under maracuja and in pasture plots. The results suggest that while densities and activities of soil mites increased in the organic plots, the community structure and recruitment period of oribatid mites were altered. Oribatid mite diversity was higher in the organic plots than in the pasture but lower than in the forest, where Belba sp. and many Eremobelboid brachypiline genera were present, but absent in the organic plots and pasture.