平原水网水体富营养化的限制因子研究

Study on limiting factors of water eutrophication of the network of rivers in plain.

研究了光照、温度、营养 (N,P)对平原水网水体藻类生长的影响 .结果表明 :在 10 0 0～ 5 0 0 0 lx光强范围内 ,藻类的生长数量随光强的增加而呈对数关系增加 ,4 0 0 0 lx是最适宜的培养光照 .在 15～30℃区间内 ,藻类的生长数量也随着温度升高而增加 ,30℃是较适宜的温度 .且温度的影响大于光照 .水中 T- P在 0 .1～ 0 .75 mg/ L范围内 ,随 T- P浓度的提高 ,藻类数量呈对数关系增加 ,而水中 T- N浓度的变化对藻类生长的影响不是很明显 .当水中 T- P>0 .5 mg/ L、T- N>1.0 mg/ L时 ,就能满足藻类大量增殖的需要 。

Influences of light intensity, temperature and nutrients (N, P) on algal growth in the water of network of rivers in plain were studied in this test. It is shown that amount of algae increased logarithmically with increase in light intensity in the range of 1 000 5 000 luxes and with rise in temperature from 15 ℃ to 30 ℃, and 4 000 luxes and 30 ℃ is most favorable. But the influence of temperature was more obvious than that of light intensity. When consistency of T P was 0.1 0.75 mg/L in water, the algal increases logarithmically with the consistency growing up, but it didn't happen with the T N. The specific growth is the highest when the consistency of T P>0.5 mg/L, T N>1.0 mg/L, and the influence of P is greater than N.