Shi Xiao-dan, Li Yong, Li Da-peng, Wang Ren, Deng Meng, Huang Yong
Huan Jing Ke Xue. 2015 May;36(5):1622-9.
The response of sediment micro environment and micro intertace to physical disturbance intensity under the physical and Chironomus plumosus disturbance was investigated by means of sediment Rhizon samplers and Unisense micro sensor system. The sediment and overlying water were taken from Meiliang bay of Taihu Lake. The results showed that the OPD reached up to 12.1 mm under the high intensity (240 r · min(-1)), while it was higher than 3. 8. mm under low intensity (60 r · min(-1)). The TOE, the difference of TOE and DOE, OPD, ORP and the difference of DO spatial distribution were all positively correlated with the physical disturbance intensity. The increasing magnitude and range of pH as well as the decreasing magnitude and range of ferrous followed the same response tendency. Within the 0-6 cm sediment, the water content and porosity as well as the microbial activity at the same depth increased with the increase of physical disturbance intensity. In addition, the degree of response of the above parameters to the physical disturbance intensity was weakened with the increase of sediment depth. It was suggested that Chironomus plumosus dug more and deeper galleries under high intensity physical disturbance. Therefore, the sediment micro environment and micro interface were transformed in the vertical direction of the sediment.
利用沉积物Rhizon采样器和Unisense微传感器系统，研究了在物理扰动和羽摇蚊干扰下，沉积物微环境和微界面对于物理干扰强度的响应。沉积物和上覆水取自太湖梅梁湾。结果表明，在高强度（240 r·min(-1)）下，扰动穿透深度（OPD）高达12.1 mm，而在低强度（60 r·min(-1)）下高于3.8 mm。总氧化态（TOE）、TOE与溶解氧（DO）的差值、OPD、氧化还原电位（ORP）以及DO空间分布的差值均与物理干扰强度呈正相关。pH的增加幅度和范围以及亚铁的降低幅度和范围遵循相同的响应趋势。在0-6 cm沉积物中，相同深度处的含水量、孔隙率以及微生物活性随物理干扰强度的增加而增加。此外，上述参数对物理干扰强度的响应程度随沉积物深度的增加而减弱。研究表明，在高强度物理干扰下，羽摇蚊挖掘的虫道更多更深。因此，沉积物微环境和微界面在沉积物的垂直方向上发生了改变。
