藻－菌生态系统代谢功能的生态学研究

在室内模拟条件下，研究了一些生态因子对藻－菌（Ａ＋Ｂ）生态系统代谢有机碳（Ｃ６Ｈ１２Ｏ６）、ＮＨ３－Ｎ和无机磷（ＩＰ）的影响．研究结果表明，当藻－菌生态系统中藻（Ａ）或菌（Ｂ）的起始数量一定时，其代谢Ｃ６Ｈ１２Ｏ６的速率，随与之组合的Ｂ或Ａ的起始数量增加（数量比则相应降低）而增加．在光照和黑暗条件下，Ａ＋Ｂ系统代谢上述３种营养物质的速率均有一定的差异．黑暗下Ｃ６Ｈ１２Ｏ６的平均代谢速率较光照下高１２．３％（Ｐ＜０．０５），ＩＰ和ＮＨ３－Ｎ的平均代谢速率则分别较光照下低１４．４％（Ｐ＜０．０５）和１６．２％（Ｐ＜０．００１）．在Ａ＋Ｂ系统和Ａ、Ｂ单培养物中，３种营养物质的代谢速率均随有机负荷量增加而增加，而且Ａ＋Ｂ系统的代谢速率分别高于单培养的Ａ和Ｂ，其中ＮＨ３－Ｎ代谢尤为显著．文章还就生态系统结构与功能的关系问题进行了讨论．

Ecological study on metabolic function of algae-bacteria ecosystem

Effects of ecological factors on metabolic rate of organic carbon(C6H12O6), NH3-N and inorganic phosphorus (IP) in an algae-bacteria ecosystem (A B) are studied under simulated conditions.The results show that the metabolic rate of C6H12O6 in A B ecosystem increases with decreasing ratio of bacteria (B)/algae (A) or algae/bacteria, and those ofC6H12O6,NH3-N and lP are different in light and dark experiments. The average metabolic rate of C6H12O6 in dark is 12.3% higher than in light, while those of IP and NH3-N in light are respectively 14. 4% and 16.2% higher than in dark.The average metabolic rate of these three nutrient matters are all increased with increasing load of organic carbon in A B,A and B cultures, especially in case of NH3-N.The relationship between structure and function of algae-bacteria ecosystem is also discussed in this paper.