What causes NPP to vary in ecosystems?

Net primary productivity varies among ecosystems and depends on many factors. These include solar energy input, temperature and moisture levels, carbon dioxide levels, nutrient availability, and community interactions (e.g., grazing by herbivores) 2.

What causes changes in NPP?

There are multiple researches analyzing the impact factors of NPP, such as precipitation, temperature and atmospheric carbon dioxide concentration (Melton et al. 2013). Some researchers conclude that soil moisture is the dominant factor controlling NPP compared with annual rainfall (Raich et al. 1991).

Why do some ecosystems have higher NPP than others?

Production forests are comparatively stable ecosystems, experiencing a longer growth cycle than food and energy crops. Food and energy crops are usually harvested at the end of a relatively short rapid growth phase, leading to a higher average NPP per unit area.

What makes an ecosystem have a high NPP?

solar energy utilization

About 40 to 85 percent of gross primary productivity is not used during respiration and becomes net primary productivity. The highest net primary productivity in terrestrial environments occurs in swamps and marshes and tropical rainforests; the lowest occurs in deserts.

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Why does primary productivity vary in different ecosystem?

It depends upon the type of plant species associated with an ecosystem, photosynthetic capacity of these plants and nutrient availability. This is the reason why it varies in different types of ecosystems.

Why does the NPP increase over time?

the NPP will increase over time because plants undergo metabolic process which increase the # of cells and cell products which can be used as energy for the next trophic level.

How does climate change affect NPP?

(2002) have indicated that climate change reduces climatic constraints on the plant growth and increases NPP in large parts of the earth, while Zhao and Running (2010) concluded that the NPP value had declined in recent decades.

What biomes have high NPP low NPP Why?

Biomes with more vegetation have higher NPP levels (tropical rainforest has the most). Important because it can be an indicator for studying health of diff plants.

How does NPP differ from GPP?

Gross primary production (GPP) is the total rate at which material is produced and net primary production (NPP) is the rate at which material is accumulated in excess of respiration. In other words, NPP is GPP minus respiration. … Net primary production is directly related to ecosystem conditions.

What biome has the highest NPP?

Tropical forests have the highest biodiversity and primary productivity of any of the terrestrial biomes. Net primary productivity ranges from 2–3 kg m2 y1 or higher.

What are the four factors important for NPP?

Four principal abiotic factors usually limit the amount of NPP on land – light, water, temperature, and mineral nutrients – and all these abiotic factors are changing rapidly as a result of human activity, with highly uncertain impli- cations for global and local NPP.

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What areas have higher NPP and why?

Main points

  • Tropical rain forests have high NPP and the highest biodiversities of any terrestrial ecosystems. …
  • In rain forests, plants have constant high levels of water and light (at canopy level) and the nutrient supply is as high as possible, due to rapid decomposition.

What 3 ecosystems have the lowest NPP?

The two most productive are estuaries, swamps and marshes, and tropical rain forests. The two least productive are open ocean, tundra, and desert.