摇蚊幼虫扰动对沉积物-水界面结构特征的影响

Bioturbation effects of Chironomus plumosus on structural characteristics of sediment-water interface

以摇蚊幼虫为研究对象,通过对不同时段摇蚊幼虫扰动下沉积物的测定,探讨生物扰动下沉积物-水界面含水率和烧失量的变化规律以及粒径垂向分布规律。结果表明:在实验初期,摇蚊幼虫的扰动改变了沉积物的含水率,到了实验的中后期,摇蚊幼虫的活动趋于稳定,含水率变化较小;摇蚊幼虫的扰动增加了沉积物的有机质质量百分比;摇蚊组实验前后沉积物颗粒的粒径变化较大,其中黏粒分布变化最大。

Targeting at Chironomus plumosus as study object, this paper probed into the variation rule of the water content rate of sediment-water interface and loss on ignition as well as the vertical distribution of particle size through measuring the sediment under Chironomus plumosus disturbance in different time periods. Results showed that at the beginning of the experiment, the disturbance of Chironomus plumosus altered the water content rate of sediment, and then at later stage in the experiment, the activities of Chironomus plumosus tended to be stable with the results of little change in water content. The disturbance of Chironomus plumosus increased the organic content in the sediment. Moreover, the particle size of sediments varied greatly before and after Chironomus plumosus group conducted the experiment, especially big changes happened to the clay particle distribution.