Rivkin R B, Legendre L
Ocean Sciences Centre, Memorial University of Newfoundland, St. John's, Newfoundland A1C 5S7, Canada.
Science. 2001 Mar 23;291(5512):2398-400. doi: 10.1126/science.291.5512.2398.
Food-web processes are important controls of oceanic biogenic carbon flux and ocean-atmosphere carbon dioxide exchange. Two key controlling parameters are the growth efficiencies of the principal trophic components and the rate of carbon remineralization. We report that bacterial growth efficiency is an inverse function of temperature. This relationship permits bacterial respiration in the euphotic zone to be computed from temperature and bacterial production. Using the temperature-growth efficiency relationship, we show that bacterial respiration generally accounts for most community respiration. This implies that a larger fraction of assimilated carbon is respired at low than at high latitudes, so a greater proportion of production can be exported in polar than in tropical regions. Because bacterial production is also a function of temperature, it should be possible to compute euphotic zone heterotrophic respiration at large scales using remotely sensed information.
食物网过程是海洋生物源碳通量和海洋 - 大气二氧化碳交换的重要控制因素。两个关键控制参数是主要营养成分的生长效率和碳再矿化速率。我们报告细菌生长效率是温度的反函数。这种关系使得真光层中的细菌呼吸可以根据温度和细菌产量来计算。利用温度 - 生长效率关系，我们表明细菌呼吸通常占群落呼吸的大部分。这意味着在低纬度地区比在高纬度地区，被同化的碳有更大比例被呼吸，因此在极地地区比在热带地区有更大比例的产量可以输出。由于细菌产量也是温度的函数，利用遥感信息应该能够在大尺度上计算真光层异养呼吸。
