Continuous automated measurement of rates of photosynthesis and respiration in an undisturbed river community1

作者：Mahlon G. Kelly, George M. Hornberger, Bernard J. Cosby · 发表于：Limnology and Oceanography · 年份：1974 · DOI：10.4319/lo.1974.19.2.0305 · 被引用次数：74 · 研究领域：Fish Ecology and Management Studies、Soil and Water Nutrient Dynamics、Freshwater macroinvertebrate diversity and ecology

A precise, continuous function (a Fourier series) describing undisturbed net community production throughout a day has been obtained from automatically recorded and processed oxygen concentration data from two stations in a river. The linear relationship found between light and productivity confirmed the precision of the method and was used to give a nearly continuous estimate of community photosynthesis, respiration, and gross productive efficiency. Respiration and efficiency may remain constant for one to several days, or may change over a few hours. Day‐to‐day variation in community photosynthesis and respiration may preclude extrapolation of a number of isolated single‐day measurements to determine seasonal or other long term trends.