鱼菜共生水体溶解氧时空变化规律及其影响因素研究

为明确鱼菜共生系统中水体溶解氧分布特征，采用室内搭建的鱼菜共生系统，利用多点采样装置以及物联网传感系统对系统中水质参数、气象数据和生物量信息进行提取，通过相关性分析对该鱼菜共生系统中溶解氧时空变化规律以及光照强度与喂食量对其时空变化的影响进行了研究。结果表明，溶解氧在鱼池中随垂直深度增加而减小，相关系数范围为-0.9～-0.7时，鱼池溶解氧空间变化量与喂食量呈显著线性关系，相关系数为0.9294，方差分析中F值为126.94。溶解氧在水培槽中随水平距离增加而减小，相关性范围为-0.9～-0.8时，水培槽溶解氧空间变化量与光照强度呈显著线性关系，相关系数为0.8158，方差分析中F值为39.7954。溶解氧日变化受到各环节空间变化影响，白天波动下降，夜间平缓上升。研究结果为鱼菜共生系统溶解氧研究提供了一定理论依据。

Temporal and Spatial Variability of Water Dissolved Oxygen with Influence Factors in Aquaponics System

In order to clarify the distribution characteristics of dissolved oxygen in water in symbiosis system, the water quality parameters, meteorological data and biomass information of the system were extracted by using the multi-point sampling device and the networking sensor system. The influence of light intensity and feed intake on the spatiotemporal variation of dissolved oxygen in the symbiosis system was studied by correlation analysis method. On the one hand, the results showed that dissolved oxygen levels decreased with the increase of vertical depth in the fish pond, the correlation was between -0.9 and -0.7. The dissolved oxygen was changed at 9:00, and there was obvious correlation between the logarithm and vertical depth of dissolved oxygen with correlation coefficient value r=0.9894 and the value of the variance analysis F=126.94. On the other hand, the dissolved oxygen decreased with the horizontal increase of the water culture tank following the correlation coefficient from -0.9 to -0.8. A significant linear relationship reached 0.89 between the dissolved oxygen content and the horizontal distance. In addition, there was the logarithmic relationship between the dissolved oxygen content of hydroponic tank and light intensity, in which the correlation coefficient was 0.8158. According to the monitoring during different time, the diurnal variation of dissolved oxygen was affected by the spatial variation. The fluctuation values of dissolved oxygen content decreased during the daytime and increased during the nighttime which might be mainly related to the change of light intensity, feeding operation and consumption. As a result, the study provides a theoretical basis for the study of dissolved oxygen in the symbiosis system.