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介绍了估测森林下水微生境获光量的一件简便高效的新方法。全阴天和晴天，从7：00到19：00每分钟测定针阔混交林下木16个微生境上方来自林冠之上的光合光子通量密度透过率（％PPFD）。也对3个阴天不同时间的％PPFD瞬间值进行了测定。％PPFD瞬间值之间以及与％PPFD日平均值之间呈密切正相关（P＜0．001）。结果表明，用阴天％PPFD瞬间测定值对林冠下任何微生境的％PPFD日平均值进行估测是实用的。
An easy and efficient new method for estimating the amount of light harvested from forest sewage is presented. All cloudy and sunny days, the photosynthetic photon flux density transmittance (% PPFD) from the canopy above 16 cones in a coniferous-broadleaved mixed forest was measured from 7:00 to 19:00 per minute. The% PPFD instantaneous values were also measured over three cloudy days. There was a close correlation between the% PPFD instantaneous values and daily mean% PPFD values (P <0.001). The results show that it is practical to estimate daily mean% PPFD values for any of the micro-habitats under canopy cover using the cloudy% PPFD transient measurements.