The molecular oxygen dissolved in water is called dissolved oxygen and is usually labeled D0. The amount of dissolved oxygen in surface water is 5-10mg/L. When there are strong winds and waves, the dissolved oxygen in the water can reach 14mg/L. Dissolved oxygen saturation = measured value of dissolved oxygen/dissolved oxygen saturation under measured conditions * 100%, that is, 90% and above, the measured value is above 7.5 mg/L, and the minimum is 2 mg/L.
Low-oxygen water will pass through plants and remove oxygen from the root system. Likewise, it will deplete the oxygen in the soil. Healthy plants and healthy soil flora need oxygen in these two parts.
Lack of dissolved oxygen in the water can also cause other problems. For example, nematodes like hypoxic soil. Irrigating plants with low-oxygen water will bring them close to the surface and easily damage the roots of the plants.
Studies have shown that reducing the concentration of dissolved oxygen in the root environment of plants will reduce the ability of plants to absorb nitrogen and water. Lack of oxygen can damage the roots. In the process of adapting to low concentrations of dissolved oxygen, the metabolism of plants has changed. Hypoxia inside the plant is called internal hypoxia. One of the consequences is the degradation of sucrose, and plants turn to energy-saving methods to compensate for the lack of oxygen.
The photosynthesis of phytoplankton is the main source of oxygen in ponds, generally accounting for 56%-80% of the oxygen source; the rest comes from wind blowing and waves, so that the oxygen in the air is directly dissolved into the water. Advantageous 12-14mg/L
Heilongjiang: A 600-square-meter tanning pond can increase the water temperature by 3 to 4 degrees and increase grain production by 6%.