Sentences with phrase «photosynthesis rates in»

But these models exhibit biases over tropical continents, showing peak evaporation and photosynthesis rates in the wrong season, as well as rain too early in the day.

Not exact matches

By comparing those disparate years to simulations of a year without tropical cyclone events, Lowman was able to calculate the effect tropical cyclones have on the rates of photosynthesis and carbon uptake in forests of the southeastern United States.

Photosynthesis — the process green plants use to convert energy from the sun that plants use to grow — from tropical forests, plays a huge role in determining global atmospheric CO2 concentration, which is closely linked the global temperature and rate of climate change.

For many crops more carbon dioxide means a rise in the rate of photosynthesis and, therefore, in growth; and with increased carbon dioxide some plants» use of water is more efficient, according to studies done in conventional glass greenhouses.

It's long been known that as levels of CO2 in the atmosphere rise, plants can increase their rate of photosynthesis.

Not well, according to this paper: when top and bottom leaves are placed in the same low light, the lower canopy leaves showed lower rates of photosynthesis.

Seagrasses also undergo a high rate of photosynthesis that may serve to buffer changes in ocean chemistry that affect shell - building organisms.

They found that photosynthesis rates were higher during the day in tanks containing fish, probably helped by the fish's fin strokes wafting away water containing high levels of oxygen.

«That's a rate that is comparable to the rate of this reaction in natural photosynthesis, per catalytic site,» Concepcion said.

Eventually, however, terrestrial red and green algae and the first lichens developed on land and the final big rise in oxygen may have been caused by the «greening of the continents from around 800 million years ago,» when these simple early lifeforms on land steadily spread and broke down rocks that sustained a higher rate of erosion and led to the release of more nutrients into the oceans that stimulated even more photosynthesis by more newly evolved algae as well as older cyanobacteria (Nick Lane, New Scientist, February 10, 2010).

Because silver damages key enzymes involved in energy metabolism, even low concentrations can cut photosynthesis and growth rates by a half in just 15 minutes.

The researchers, noting they only looked at one species, said the work suggests that the organisms could double their rate of photosynthesis and calcium uptake in carbon dioxide concentrations around double the current level of 380 parts per million.

The rate of photosynthesis increases as the irradiance level is increased; however at one point, any further increase in the amount of light that strikes the plant does not cause any increase to the rate of photosynthesis.

[Response: Our rate of mining CO2 from the Earth and putting it in the atmosphere is small compared to the back - and - forth rates of photosynthesis and dissolution / exsolution from the ocean.

So it is quite likely that plant photosynthesis (including that happening in the ocean from phytoplankton) could well be constrained by CO2 concentration at 280 ppmv, with a slightly higher input from animal respiration plus emissions from the Earth's interior balancing out the natural decay rate.

Was this «decay rate» offset in the past by slightly higher animal respiration than plant photosynthesis, plus unknown CO2 emissions from submarine volcanoes and fissures in Earth's crust?

It also suggests that water availability is a more important factor in the rate of photosynthesis.

Research suggests that when there's more carbon dioxide in the air, trees grow more quickly because the rate of photosynthesis speeds up.

Experiments scientists have carried out in temperate forests and greenhouses suggest that when there's more carbon dioxide in the air, trees can grow more quickly because their photosynthesis rate speeds up.

Elevated CO2 could benefit crops yields in short term by increasing photosynthesis rates, however, there is big uncertainty in the magnitude of the CO2 effect and that interactions with other factors.

So, consistent with previous research, the study finds that trees can use water more efficiently when there's more carbon dioxide in the air, which makes their rate of photosynthesis increase.

There are two primary externalities that result from our emissions of carbon dioxide into the atmosphere — 1) an enhancement of the greenhouse effect, which results in an alteration of the energy flow in the earth's climate and a general tendency to warm the global average surface temperature, and 2) an enhancement of the rate of photosynthesis in plants and a general tendency to result in more efficient growth and an overall healthier condition of vegetation (including crops).

you may observe that at around 400 ppmv, the net rate of photosynthesis in ideal greenhouse conditions begins to gain much less per additional unit of CO2; we've already hit the point of diminishing returns and by Liebig's Law of the Minimum can say with some confidence that experiments could find that additional CO2 on plants in the wild may be net detrimental right now.

Of course, we do know that the rate of photosynthesis (the rate - limiting step in the growth of most plants) depends on temperature.

While lots of carbon cycles in and out of the atmosphere from photosynthesis and decay (most of that 95 % figure), the planet has a (comparably) very slow rate of removing carbon from the atmosphere and oceans for geological timescales — only enough to roughly cancel out volcanoes and other proportionally very small «old carbon» sources.

[Response: Your argument misses the point in three different and important ways, not even considering whether or not the Black Hills data have any general applicability elsewhere, which they may or may not: (1) It ignores the point made in the post about the potential effect of previous, seasonal warming on the magnitude of an extreme event in mid summer to early fall, due to things like (especially) a depletion in soil moisture and consequent accumulation of degree days, (2) it ignores that biological sensitivity is far FAR greater during the warm season than the cold season for a whole number of crucial variables ranging from respiration and photosynthesis to transpiration rates, and (3) it ignores the potential for derivative effects, particularly fire and smoke, in radically increasing the local temperature effects of the heat wave.

C (or methane hydrates / clathrates, in case that isn't considered geologic)-RRB-, Halting all marine photosynthesis and letting respiration / decay continue at the same rate (it would actually decay over time as less organic C would be available) would result in an O2 decrease at a rate of about 0.011 % per year, but it could only fall at that rate for about 3 weeks, with a total O2 decrease of about 0.000675 % (relative to total O2, and not counting organic C burial, which wouldn't make a big difference); Halting all land photosynthesis and letting respirationd / decay proceed at the same rate would cause O2 to fall about 0.027 % per year for about 19 years, with a total drop of about 0.52 %.

You said, «Halting all marine photosynthesis and letting respiration / decay continue at the same rate (it would actually decay over time as less organic C would be available) would result in an O2 decrease at a rate of about 0.011 % per year, but it could only fall at that rate for about 3 weeks, with a total O2 decrease of about 0.000675 %»

As more carbon dioxide dissolves into the water column, phytoplankton are able to increase their rate of photosynthesis, resulting in the production of more dissolved organic matter and the release of various nutrients.