Navigation Links
Drought-exposed leaves adversely affect soil nutrients, study shows
Date:4/5/2011

WEST LAFAYETTE, Ind. - Chemical changes in tree leaves subjected to warmer, drier conditions that could result from climate change may reduce the availability of soil nutrients, according to a Purdue University study.

Jeff Dukes, an associate professor of forestry and natural resources, found that red maple leaves accumulate about twice as much tannin when exposed to hot, droughtlike conditions. Those tannins, which defend leaves from herbivores and pathogens, were shown to interfere with the function of common enzymes in soil.

"When the leaves are particularly water-stressed by drought or drought with higher temperatures, we see more protective compounds, more tannins and a change in the chemistry of the tannins," said Dukes, whose findings were published in the early online version of the journal New Phytologist. "This suggests that when these leaves fall, they may slow down soil processes such as decomposition and nutrient cycling. This could, in turn, affect plant growth and nutrient uptake."

The findings are the first for the Boston Area Climate Experiment, a National Science Foundation-funded project that Dukes directs. Plants on several field plots are exposed to various future climate scenarios using heaters and other means to control conditions.

"We've basically built a big time machine that moves different plots of land into different possible futures by changing temperatures and precipitation levels," Dukes said.

The increase in leaf tannins observed in this experiment could cause leaves to decompose more slowly and also interfere with critical soil enzymes, leaving fewer nutrients for plants. The tannins in the red maple leaves also were chemically different, making them interact more strongly with the soil enzymes.

Dukes said the tannin issue could effect a sort of tug-of-war in the carbon cycle. With fewer nutrients, plants would take carbon dioxide out of the air more slowly. But if fallen leaves are decomposing slower, then the carbon would be released back to the atmosphere more slowly.

"This is an issue that could affect many natural processes," Dukes said. "We just don't know what the net result will be."

In this experiment, leaves were removed from the experiment plots and tested in laboratories. Dukes said he would next test other plants' leaves exposed to similar conditions to see how their tannins are affected. He also will test his findings in the field to see how an increase in tannins affects soil in a natural setting.


'/>"/>

Contact: Brian Wallheimer
bwallhei@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert  

Related biology news :

1. Its good to have a shady side: sun and shade leaves play different roles in tree canopies
2. The lifeblood of leaves: Vein networks control plant patterns
3. Love ballad leaves women more open to a date
4. Can the morphology of fossil leaves tell us how early flowering plants grew?
5. Seeing the forest through the trees and seeing the trees through the leaves
6. Intensive land management leaves Europe without carbon sinks
7. Sun or shade: Pecan leaves photosynthetic light response evaluated
8. Bird flu leaves the nest -- adapting to a new host
9. Why are autumn leaves red in America and yellow in Europe?
10. The hepatitis healing power of blueberry leaves
11. A win-win: U-pick pumpkin farms recycle urban leaves
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Drought-exposed leaves adversely affect soil nutrients, study shows
(Date:4/4/2017)... NEW YORK , April 4, 2017   ... solutions, today announced that the United States Patent and ... The patent broadly covers the linking of an iris ... the same transaction) and represents the company,s 45 th ... our latest patent is very timely given the multi-modal ...
(Date:3/30/2017)... , March 30, 2017 Trends, opportunities and ... and behavioral), by technology (fingerprint, AFIS, iris recognition, facial ... and others), by end use industry (government and law ... financial and banking, and others), and by region ( ... , Asia Pacific , and the ...
(Date:3/24/2017)... -- The Controller General of Immigration from Maldives Mr. ... have received the prestigious international IAIR Award for the most innovative high ... ... Maldives Immigration Controller ... (small picture on the right) have received the IAIR award for the ...
Breaking Biology News(10 mins):
(Date:6/19/2017)... , ... June 19, 2017 , ... ... all service activities supporting EDETEK’s products including training, implementation, support, and client process ... his new role. He has previously held leadership roles for service providers and ...
(Date:6/19/2017)... King of Prussia, PA (PRWEB) , ... June 19, 2017 , ... ... by life sciences companies for over 50 years. One of the biggest challenges faced ... environment. Joining the firm’s regulatory affairs services team is Kati Abraham , who ...
(Date:6/16/2017)... ... June 16, 2017 , ... Cognition Corporation , ... two more sessions of its “From the Helm” Webinar Series. , The ... online templates for design control exercises. Led by David Cronin, Cognition’s CEO, the ...
(Date:6/16/2017)... (PRWEB) , ... June 16, 2017 , ... CTNext ... Entrepreneur Innovation Awards (EIA), held at The LOFT at Chelsea Piers in Stamford. , ... ideas to a panel of judges for an opportunity to secure $10,000 awards to ...
Breaking Biology Technology: