横断山区湖泊中溶解氧的分布特征

本文是对横断山地区17个湖泊水体中溶解氧含迸的测定。其平均含货在5.86~8.35mg/L之间，最大含里可达14.54mg/L。湖泊中溶解氧含量在地域分布上随箝海拔高度升高而下降。由于受湖泊中水体运动影响，湖泊表层水中溶解氧分布较一致，但在深水湖泊中表层和底层含量即有明显差异，且随着水深加大溶解氧下降，如马湖，在水深l00m以下为无氧区，致使生物大量死亡。在深水层的温跃层附近（10—50m）溶解氧出现跃变现象。此外，湖泊中水生生物分布，以及有机质污染，对水体中溶解氧含量和分布亦有直接影响。

Dissolved Oxygen (DO) Distribution In The Lakes Of Hengduan mountain Area

This paper discribed the measurement results of the dissolved oxygen(DO) in the water bodies of seventeen lakes over Hengduanshan Mountains. The average DO content in the lakes is about 5.86 mg/L to 8.35 mg/L, and the maximum value is 14.54 mg/L. The distribution of DO content is varying with different lakes at different altitudes and the value decreases with the increasing of elevation. Because of the water movemeht, the DO content in the upper part of lake water is nearly stable. But in deep lakes, the DO content is obviously different between upper part and lower part, and the value decreases with the increasing of the water depth, for example, in the Mahu Lake there is no oxygen beneath the depth of 100 m, so no living creatures exist. Through the themocline about 10 m to 50 m beneath the water surface in some lakes, DO content decreases sharply. In addition, the DO content distribution in some lakes is also affected by aquatic plant growth and organic pollution.