Primary productivity in forests often increases during the early stages of stand development and then decreases again as the forest ages and standing biomass increases.

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This is known as the age-related decline in productivity, where younger forests are able to photosynthesize more efficiently and generate more biomass while older, mature forests have already accumulated a lot of biomass and are limited by factors such as light and nutrient availability.

Primary Productivity in Forests Often Increases During the Early Stages