华北盐渍化改造区农田步甲群落及其动态研究:以河北省曲周县为例

1996与1997年在河北省曲周县盐渍化改造区，采用陷阱法调查了农田中步甲的物种组成与数量分布。共记录到步甲19个种，分隶于8个属。其中婪步甲属(Harpalus)在数量上占绝对优势。总体来说，本地步甲区系组成相对简单，属与物种数较少。单齿婪步甲(Harpalus simplicidens)、毛婪步甲(H.griseus)和三齿婪步甲(H.tridens)为优势物种。从时间动态上看，步甲数量呈总体上升趋势，9月份最多，10月份下降到最低。步甲数量的季节变动在不同种植模式间不同，并在一定程度上受农田景观及农事活动的影响。农田边界是生物的避难所和聚集地，对步甲有重要的保护作用，农田边界上的步甲密度普遍比相邻农田中高，月份间步甲数量的波动幅度也较小。

Carabid community and its fluctuation in farmland of salinity transforming area in the North China Plain:a case study in Quzhou County, Hebei Province

In 1996 and 1997, a carabid community and its fluctuation were studied by the pitfall method in the salinity transforming area in Quzhou County, Hebei Province, China. The community consists of 19 species belonging to 8 genera. Harpalus is the dominant genus and ranks the first in abundance. As a whole, the carabid fauna in this area is simple, having relatively few species and genera. The dominant species are Harpalus simplicidens, H. griseus and H. tridens. Considering the monthly fluctuation of carabid abundance, it reaches a maximum in September, and falls to a minimum in October. The fluctuation of carabids differs among different crop-planting patterns, and is affected to an extent by the changes of the landscape and agricultural activities. Field margins are shelters for carabids where they tend to gather, and these margins play a pivotal role in protecting the carabids. Carabid density in field margins is higher than that in adjacent farmlands, and the monthly fluctuation range there is also narrower.