黄河三角洲土壤动物群落结构特征

本文对黄河三角洲土壤动物群落结构特征进行系统分析，探讨各年代、植被类型土壤动物群落特点及演替过程．研究结果表明，黄河三角洲土壤环境条件恶劣，土壤动物无论从数量上还是从种类上均较贫乏，全区平均密度不足1万，在纲或目分类水平上仅17类群．螨类和跳虫在11个样点中均为优势类群，且每个样点中均只有这两个优势类群．A／C值全区全年平均为2．04，明显大于1．4个季度中，冬季和夏季的A／C值较大，说明螨类对低温或干旱等不利环境适应力和抵抗力强于跳虫．随成土年限或植物群落演替，土壤动物群落均未能表现出明显的演替过程，有必要对土壤动物的分类进一步细化．

STRUCTURE CHARACTERISTICS OF SOIL ANIMAL COMMUNITY IN THE YELLOW RIVER DELTA

Structure characteristics of soil animal community in the Yellow River Delta was studied intensively and systematically, and its structure characteristics and succession process were discussed from each decade and different vegetation type as well. Results show that, the geographical environment of the Yellow River Delta is simple, both species number and quantity of the soil animals are poor, average density of animal is less than 10 thousand individuals in the entire region, and only 17 classes or orders of the soil animals are obtained. Mites and Collembola are the dominant groups in all the 11 sampling sites, and they are the only two dominant groups at each site. The annual average A / C value of the whole area is 2.04, significantly greater than 1. A / C values in winter and summer are comparatively larger in the four quarters of the year, indieating that adaption and resistance of mites to low temperature or drought is stronger than that of Collembola. Succession of the soil animal community failed to show obviously along with the pedogenesis years and succession of plant community , and it is necessary to further refine the classification of soil animals.