Table of Contents
Why does the open ocean have such a low NPP?
The average NPP of the ocean is so low because the ocean’s volume (mostly open space) in comparison to the amount of producers is massive.
What causes high NPP?
Net Primary Productivity is affected by temperature, water availability, carbon dioxide, and nutrients, all of which are abiotic factors. In Tropical Rainforests, water, sunlight, and high temperatures are consistent and a dense concentration of plants is present, causing both the GPP and NPP to be very high.
Why do oceans have low productivity than land?
Decrease in rate of photosynthesis decreases the growth of aquatic plants and animals. Minerals and nutrients can also be a retarding factor based on location of the oceans.So, there will be less productivity than land which is 170 billion tons compared to 55 billion tons ion oceans.
Does the ocean have high NPP?
NPP is high in coral reef since the high light intensity and warm water allow rapid photosynthesis….Main points.
| ecosystem | Net primary production – dry (g m-2year-1) | Area (106km) |
|---|---|---|
| Open ocean | 125 | 332 |
| Continental shelf | 350 | 27 |
| Coral reef & estuaries | 2,000 | 2 |
What part of the ocean has the highest NPP?
Higher chlorophyll concentrations and in general higher productivity are observed on the equator, along the coasts (especially eastern margins), and in the high latitude ocean (Figure 4a and b).
What is a high NPP?
Basic ideas – NPP in terrestrial ecosystems 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 does high NPP mean?
NPP is the net energy available after respiration. The higher the net primary production, the more animals can be supported per unit area. In most natural ecosystems, high net primary production is generally accompanied by a highly diverse plant and animal community.
What two main factors determine ocean productivity?
Ocean Productivity. Abiotic factors like solar radiation and nutrients, and biotic factors like zooplankton predation may affect ocean primary productivity. Productivity varies with the season, and also locally and globally.
Where is NPP the highest?
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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