Production efficiency - ecosystem, Biology

Production Efficiency - Ecosystem

The maximum amount of solar energy harvested by plants is about 5 per cent but the average for green plants, on the whole is only a small fraction of sunlight, i.e., 0.02 per cent reaching the atmosphere. The production efficiency that is the ratio of net primary production to gross primary production (of green plants) is on the average rather high. It varies between 40 to 85 per cent. The most efficient are those plants which have low maintenance requirement due to minimum non-photosynthetic (non green) tissues, such as in grasses, algae and phytoplankton. Algae and crops like corn have an efficiency of about 80 to 85 per cent, submerged aquatic plants 60 to 75 per cent, deciduous forests about 42 per cent. Different ecosystems have different productivities.

Productivity of ecosystems depends on a variety of factors such as sunlight, temperature, rainfall and the availability of nutrients. Those situations that provide the best circumstances for plant growth are the most productive. Warm, moist, sunny areas with high levels of nutrients in the soil are ideal. Some areas have low productivity because one of the essential factors is missing. Deserts have low productivity because water is scarce, arctic areas too have low productivity because temperature is low, and open oceans also have low productivity because nutrients are in short supply. Coral reefs and tropical rain forests have high productivity. Marshes and estuaries are-highly productive since waters running into them are rich in the nutrients and they also get enough light.

Posted Date: 1/19/2013 1:30:31 AM | Location : United States







Related Discussions:- Production efficiency - ecosystem, Assignment Help, Ask Question on Production efficiency - ecosystem, Get Answer, Expert's Help, Production efficiency - ecosystem Discussions

Write discussion on Production efficiency - ecosystem
Your posts are moderated
Related Questions
Q. What is Impaired Glucose Tolerance? Glucose tolerance is assessed by taking the fasting blood sugar value. An oral glucose load of 75 grams glucose is administered and blood

Class of Crustacea - Branchiura Branchiura involves only around 130 species of ectoparasitic crustaceans living mostly on the integument and gill cavities of freshwater and ma

1. By direct measurement of the activity of the thyroid gland in several patients who had received 131 I for diagnostic purposes, it was observed that the biological elimination h

Suppose that a portion of double-stranded DNA in the middle of a large gene is being transcribed by an RNA polymerase. As the polymerase moves through the sequence of six bases sho

Q. What do you mean by Congenital Long QT Syndrome? There is a rare group of young patients who suddenly pass out due to a spontaneous ventricular tachycardia and often have fa

what are the organs of respiration in lower forms of animals?

Discovery of Plant Hormones To date, five major classes of plant hormones have been discovered namely auxins, gibberellins, cytokinins, abscisic acid and ethylene. It is possi

Q. Describe Shunts? Detection, localization and quantification of intracardiac shunts are one of the most important exercises in cardiac catheterization. In most cases a prelim

An increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads to A. increased binding of calcium ions

What is Microbodies ? Microbodies : Microbodies are formed by pinching off of vesicles from rough endoplasmic reticulum. They are not found in every cell, but are present a