热带次生林刀耕火种过程中土壤节肢动物群落结构及多样性的变化

通过模拟刀耕火种过程，对热带次生林土壤节肢运动群薄结构及多样性在刀耕火种过程中变化进行了初步研究，结果表明，火烧1周后，土壤节肢运行类群数和个体数从次生林地的14类，564头降为7类，164头，并且在群落组成上发生了较大变化，膜翅目的烧后1天成为突出优势类群，蜱蟥目在烧后1周成为唯一的优势类群，而在多样性方面，土壤节肢运动群落类群数（丰度），个体数（多度）和DG多样性指数在刀耕火种过程中均降低，土壤节肢运动的垂直分布因刀耕火种干扰发生了很大变化，尚存土壤节肢运动随干扰强度的加剧，出现逐步由土壤表层向深层迁移的现象，一些土壤节肢运动在土层间做垂直迁移活动，说明土壤层在一定程度上减轻了刀耕火种对它们的破坏作用，维持了某些类群数量及群落多样性。

Change in structure and diversity of soil arthropod communities after slash-and-burn of secondary forest in Xishuangbanna, Yunnan Province

The change in structure and diversity of soil arthropod communities of secondary forest after the simulated process of slash and burn was studied in Xishuangbanna. The results showed that colonies and individuals of soil arthropod communities declined from 14 colonies, 564 individuals in secondary forest to 7 colonies, 164 individuals in slash and burn fields one week after burning. The composition of soil arthropod communities was also changed. The proportion of individuals of Hymenoptera (ants) in burned remnants was greatly increased on the first day after burning, and this was obviously the dominant group in the soil arthropod community. The proportion of individuals of Acari was greatly increased during the first week after burning, and it was the only dominant group of the soil arthropod community in the field. The diversity of the soil arthropod community was decreased and the vertical structure of the community was disrupted by slash and burn. After the slash and burn process, there were many more colonies and individuals of soil arthropod in the lower soil than in the surface soil. The destruction by slash and burn of soil arthropod communities was reduced to a certain extent in deeper soil layers. Some soil arthropods can keep their numbers and species by moving lower in the soil during the slash and burn process.