This known as a capillary lag. The plant ultimately wilts as it can not extract enough water to meet the increasing demand for water during warm seasons. A small soil moisture reserve will inhibit transpiration too. Plant transpiration during dry periods. So long as the rate of production exceeds that of respiration, the plant will grow.
Net productivity represents the amount of organic material produced by a plant.
Net productivity is closely related to a number of environmental factors like climate, soils, and available nutrients. The figure below illustrates this well. With ample rainfall and sunlight, the tropical rainforest ranks the highest in terms of organic matter production. Note that environments like the tropical rainforest exhibit huge amounts of net productivity as both light and moisture are readily available for plant growth. The biotic elements that comprise an ecosystem fall into one of several trophic levels .