Navigation Links
No convincing evidence for decline in tropical forests
Date:1/7/2008

have not spotted.

Dr Grainger first examined data published every 10 years by the United Nations Food and Agriculture Organization (FAO) since 1980. These cover all forest in the humid and dry tropics and appear to indicate decline. FAO's Global Forest Resources Assessment 2000, for example, showed that all tropical forest area fell from 1,926 million hectares to 1,799 million hectares between 1990 and 2000. Ten years earlier, however, FAOs previous report said that tropical forest area fell from 1,910 million ha to 1,756 million ha for the same 90 countries between 1980 and 1990.

Owing to corrections to the earlier study, the 1990s trend was just like a 're-run' of that in the 1980s, said Dr Grainger. The errors involved in making estimates for forest area could easily be of the same order as the forest area reported cleared in the previous 10 years. Even if you take enormous care, as FAO does, I argue that large errors are inevitable if you produce global estimates by aggregating national statistics from many countries. This has important implications for the many scientists who rely on FAO data.

Since errors in national statistics are higher for forests in the dry tropics than for forests in the humid tropics, in places near the Equator such as Amazonia, Borneo and the Congo Basin, he repeated the process just for tropical moist forest, with a different set of data, in the hope it would give a clearer picture. This time he found no evidence for decline since the early 1970s. Indeed, while his own estimate in 1983 of tropical moist forest area in 1980 was 1,081 million hectares, the latest satellite data led to an estimate of 1,181 million hectares for the same 63 countries in 2000.

He is cautious about the apparent slight rise. We would expect to see some increase in estimates as we use more accurate satellite sensors. This is even apparent in FAOs data. It is sad that only in the last 10 years have we begun to make full use o
'/>"/>

Contact: Simon Jenkins
S.Jenkins@leeds.ac.uk
44-011-334-34031
University of Leeds
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Scientific evidence supporting evolution continues to grow
2. There is powerful evidence of evolution in human DNA
3. CWRU School of Medicine has evidence vaccine against malaria will reduce disease
4. RAND study finds evidence disease management programs
5. New evidence for female control in reproduction
6. Fossil record supports evidence of impending mass extinction
7. Researchers find evidence linking stress caused by the Sept. 11 disaster with low birth weights
8. Evidence of a relationship between swimming babies and infections
9. Comet probes reveal evidence of origin of life, scientists claim
10. A private bandwidth for communication in bats: Evidence from insular horseshoe bats
11. Decline in uptake of carbon emissions confirmed
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/24/2015)... 2015  Synaptics Inc. (NASDAQ: SYNA ), ... announced that Sharp has selected its industry-leading Natural ... its latest flagship smartphone device, the AQUOS ZETA ... shipments of its fingerprint ID sensor technology, this ... and leadership in the biometrics market through its ...
(Date:6/23/2015)... June 23, 2015   Valencell, a ... results of a recent study that illustrates its ... wrist during activity. In a study conducted at ... along with the Apple Watch against a chest ... rate during activity. The study demonstrated that Valencell,s ...
(Date:6/17/2015)... HILDEN, Germany , June 17, 2015 /PRNewswire/ ... Prime Standard: QIA) today launched new Investigator ® STR ... in the United States . The new ... multiple key genomic markers (short tandem repeats or STRs) for ... to evaluate the quality of DNA in each sample, a ...
Breaking Biology News(10 mins):Synaptics Brings Natural ID Technology to Sharp's Newest Flagship Smartphone 2Valencell Delivers Breakthrough Heart Rate Accuracy on the Wrist 2Valencell Delivers Breakthrough Heart Rate Accuracy on the Wrist 3QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 2QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 3QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 4QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 5
... of those diseases few have heard of unless you know ... child or teenager -- it is devastating. Symptoms are mild ... impairment and slurred speech, but eventually the symptoms progress and ... in life. There is no cure at this time, but ...
... a person's under stress or injured, the adrenal gland ... normal. But the hormone's effects are many and varied, ... memories with short-term exposure, while impairing learning if there's ... its effects,understanding how cortisol is made is essential to ...
... know how to digest cellulose, but the human process ... The central bottleneck is the sluggish rate at which ... into sugars, which are then fermented into ethanol. , ... scientists has conducted molecular simulations at the San Diego ...
Cached Biology News:Moonlighting enzyme linked to neurodegenerative disease 2Moonlighting enzyme linked to neurodegenerative disease 3Scientists unravel clue in cortisol production 2Meeting the ethanol challenge: Scientists use supercomputer to target cellulose bottleneck 2Meeting the ethanol challenge: Scientists use supercomputer to target cellulose bottleneck 3
(Date:6/30/2015)... June 30, 2015  Today, Americord Registry, one of the ... Andrew Horne , a partner at Kirkland & Ellis LLP, ... Logo - http://photos.prnewswire.com/prnh/20150630/226958LOGO   "We are ... Board," says Martin Smithmyer , CEO of Americord. "He ... career that will assist Americord,s growth and vision." ...
(Date:6/30/2015)... ... , ... The maximum number of shares proposed to be purchased in the ... unvested restricted stock). On June 29, 2015, the last trading day prior to the ... the OTCBB was $2.29 per share. , The tender offer will expire on July ...
(Date:6/30/2015)... /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) ... focused on the development of autologous cell therapies, announced ... 1/2 clinical trial of RCT-01, being tested for ... been enrolled and their tissue biopsy sent for ... comprised of non-bulbar dermal sheath (NBDS) cells isolated ...
(Date:6/30/2015)... ... June 30, 2015 , ... Cannavoices , Inc., a ... digital video and broadcast initiative. Produced by filmmakers, the multi-platform initiative aims to ... medical cannabis stories ever assembled. , Cannavoices profiles Advocates, Patients, Entrepreneurs, Growers, ...
Breaking Biology Technology:Americord Registry Announces Andrew Horne as Advisory Board Member 2Cryo-Cell Commences Tender Offer to Purchase its Common Stock, Up to 750,000 Shares at $3.25 per Share 2Cryo-Cell Commences Tender Offer to Purchase its Common Stock, Up to 750,000 Shares at $3.25 per Share 3RepliCel Life Sciences Enrolls First Participant in Phase 1/2 Clinical Trial of RCT-01 for Chronic Achilles Tendinosis 2RepliCel Life Sciences Enrolls First Participant in Phase 1/2 Clinical Trial of RCT-01 for Chronic Achilles Tendinosis 3RepliCel Life Sciences Enrolls First Participant in Phase 1/2 Clinical Trial of RCT-01 for Chronic Achilles Tendinosis 4Cannavoices Launches a Legal Medical Cannabis Documentary Initiative 2Cannavoices Launches a Legal Medical Cannabis Documentary Initiative 3
... Neurocrine Biosciences, Inc.,(Nasdaq: NBIX ) announced ... Neurocrine Biosciences will be presenting at the 20th,Annual Piper ... The live "fireside chat" ... Eastern Time (ET) /10:30 a.m. Pacific Time (PT). The,presentation ...
... MINRAD International, Inc. (Amex: BUF ), announced effective ... 50 positions. , , ... taken this difficult, but necessary action to reduce our cost ... adverse financial condition as we discussed in our recently announced ...
... BMP Sunstone,Corporation (Nasdaq: BJGP ) ("BMP ... subsidiary, Sunstone (Tangshan) Pharmaceutical Co., Ltd,("Sunstone"), has signed ... hard capsule (LFHC) used to treat constipation. ... sealing production line, as well as,related LFHC technology ...
Cached Biology Technology:MINRAD International, Inc. Announces Reduction in Workforce 2BMP Sunstone Acquires 'Runchang Capsule' and Related LFHC Technology 2BMP Sunstone Acquires 'Runchang Capsule' and Related LFHC Technology 3
Anti-Wnt-2 Polyclonal Antibody Description: 100 g purified goat polyclonal antibody. Reacts with human/mouse/rat. Tested in Western blot/IP/IHC. Research Focus: signal transduction Storage...
... calibration, and validation (MCV) plate ... plate used for hands-free startup, ... using the Bio-Plex suspension array ... for use with Bio-Plex Manager ...
... first biological reagent that eliminates ... not just by inhibiting growth. ... agent that can be used ... The cytotoxicity of Mynox is ...
A component of the Acridinium protein labeling kit....
Biology Products: