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在水产养殖过程中,由于投饵施肥量高,水质肥,有机质丰富,水中耗氧因子增大,倘若对水质控制不好,很容易引起水质恶化,造成鱼缺氧浮头。池塘溶解氧的变化,相当程度地反映了池塘养鱼的生产能力和生产水平。水中溶解氧的含量因此成为池塘养殖中水质管理的重要指标。水体中的氧气含量与大气相比,含量较小,并且随着水温、气压和水生生物活动等因素影响而变化。池塘中90%的溶氧量来自浮游植物的光合作用,当白天光合作用旺盛时,上层水中的溶氧量可达到饱和,而下层水因受上下水层间的热阻力影响而无法扩散到底层,
In the process of aquaculture, due to the high fertilization rate of fertilization, water and fertilizer, rich in organic matter, oxygen consumption factor in water increases, if the water quality control is not good, it is easy to cause deterioration of water quality, causing fish hypoxia floating head. Changes in pond dissolved oxygen, to a considerable extent, reflects the production capacity of fish ponds and production levels. The dissolved oxygen content of water has therefore become an important indicator of water quality management in pond aquaculture. The oxygen content in water body is smaller than the atmosphere, and it changes with the influence of water temperature, air pressure and aquatic biological activities. 90% of dissolved oxygen in the pond comes from the photosynthesis of phytoplankton. When the photosynthesis is good during the day, the amount of dissolved oxygen in the upper water reaches saturation, while the lower water can not diffuse to the bottom due to the thermal resistance between the upper and lower water layers ,