Navigation Links
Drought drives decade-long decline in plant growth

Global plant productivity that once was on the rise with warming temperatures and a lengthened growing season is now on the decline because of regional drought according to a new study of NASA satellite data.

Plant productivity is a measure of the rate of the photosynthesis process that green plants use to convert solar energy, carbon dioxide and water to sugar, oxygen and eventually plant tissue. Compared with a 6 percent increase in plant productivity during the 1980s and 1990s, the decline observed over the last decade is only 1 percent. The shift, however, could impact food security, biofuels and the global carbon cycle.

Researchers Maosheng Zhao and Steven Running of the University of Montana in Missoula discovered the global shift from an analysis of NASA satellite data. The discovery comes from an analysis of plant productivity data from the Moderate Resolution Imaging Spectroradiometer on NASA's Terra satellite, combined with other growing season climate data, including temperature, solar radiation and water.

"We see this as a bit of a surprise, and potentially significant on a policy level because previous interpretations suggested global warming might actually help plant growth around the world," Running said.

Previous research found land plant productivity was on the rise. A 2003 paper in the journal Science led by scientist Ramakrishna Nemani, now a researcher at NASA's Ames Research Center in Moffett Field, Calif., showed the 6 percent increase in global terrestrial plant productivity between 1982 and 1999. The increase was traced to nearly two decades of temperature, solar radiation and water availability conditions, influenced by climate change, that were favorable for plant growth.

Setting out to update that analysis, Zhao and Running expected to see similar results as global average temperatures continued to climb. Instead, they found the negative impact of regional drought overwhelmed the positive influence of a longer growing season, driving down global plant productivity between 2000 and 2009. The team published its findings Thursday in Science.

"This is a pretty serious warning that warmer temperatures are not going to endlessly improve plant growth," Running said.

Zhao and Running's analysis showed that since 2000, high-latitude Northern Hemisphere ecosystems have continued to benefit from warmer temperatures and a longer growing season. But that effect was offset by warming-associated drought that limited growth in the Southern Hemisphere, resulting in a net global loss of land productivity.

"This past decade's net decline in terrestrial productivity illustrates that a complex interplay between temperature, rainfall, cloudiness, and carbon dioxide, probably in combination with other factors such as nutrients and land management, will determine future patterns and trends in productivity," said Diane Wickland, program manager of the Terrestrial Ecology research program at NASA Headquarters in Washington.

Researchers want to continue monitoring these trends in the future because plant productivity is linked to shifting levels of greenhouse gas carbon dioxide in the atmosphere and stresses on plant growth that could challenge food production.

"Even if the declining trend of the past decade does not continue, managing forests and crop lands for multiple benefits to include food production, biofuel harvest, and carbon storage may become exceedingly challenging in light of the possible impacts of such decadal-scale changes," Wickland said.


Contact: Steve Cole
NASA/Goddard Space Flight Center

Related biology news :

1. Common PGR helps creeping bentgrass weather drought
2. Plant hormone increases cotton yields in drought conditions
3. UC Riverside to host 3-day international meeting on drought
4. Genes for drought-tolerance, aflatoxin may mingle to boost corn production
5. VAI researchers find long awaited key to creating drought resistant crops
6. UCR plant scientists research spawns new discoveries showing how crops survive drought
7. National report shines light on lupus 50-year treatment drought
8. National Science Foundation funds systems biology study of crop drought responses
9. MU researchers create drought conditions to unearth solutions
10. Australias climate: Drought and flooding in annual rings of tropical trees
11. Synthetic chemical offers solution for crops facing drought
Post Your Comments:
Related Image:
Drought drives decade-long decline in plant growth
(Date:11/26/2015)... Research and Markets ( ) has ... - Technology and Patent Infringement Risk Analysis" report ... --> Fingerprint sensors using capacitive technology represent ... sensor vendor Idex forecasts an increase of 360% of ... and of the fingerprint sensor market between 2014 and ...
(Date:11/20/2015)... November 20, 2015 NXTD ) ... on the growing mobile commerce market and creator of ... Pereira , was recently interviewed on The RedChip ... on this weekend on Bloomberg Europe , Bloomberg ... --> NXTD ) ("NXT-ID" or the "Company"), ...
(Date:11/19/2015)...  Based on its in-depth analysis of the biometric ... the 2015 Global Frost & Sullivan Award for Product ... this award to the company that has developed the ... the market it serves. The award recognizes the extent ... customer base demands, the overall impact it has in ...
Breaking Biology News(10 mins):
(Date:11/28/2015)... South Korea (PRWEB) , ... November 28, 2015 , ... ... class of eco-friendly avian, porcine and rodent control solutions , ... as peppermint and cinnamon oil, works across all sensory modalities including visual, smell, taste ...
(Date:11/27/2015)... Kingdom , Nov. 27, 2015 /PRNewswire/--  Mallinckrodt plc ... company, announced today that it has closed the sale ... business to Guerbet (GBT- NYSE Euronext) in a transaction ... encompassed four manufacturing facilities and a total of approximately ... in the St. Louis area. ...
(Date:11/27/2015)... ... November 27, 2015 , ... ... includes over 2,000 technical presentations offered in symposia, oral sessions, workshops, awards, and ... covers a wide range of applications such as, but not limited to, biotechnology, ...
(Date:11/27/2015)... India , November 27, 2015 /PRNewswire/ ... --> Growing popularity of companion diagnostics ... in cancer biomarkers market with pharmaceutical companies ... in-demand companion diagnostic tests. ... --> Complete report on global cancer ...
Breaking Biology Technology: