tailieunhanh - Human-induced changes in US biogenic volatile organic compound emissions: evidence from long-term forest inventory data

There are three types of consumer perception about organic product: pro-organic, health conscious, and skeptic and it shown at the figure 2. The most pro-organic say that organic farming is better for the environment. Since the organic farming can avoid pesticides and other toxins, so it might be the number one reason of the health conscious one. In the other hand, there are skeptic minds which say that organic products are too expensive, so they don’t want to spend their money for it. In figure 3, it showed the survey that had been done in Ireland, Germany,. | Global Change Biology 2004 10 1737-1755 doi Human-induced changes in US biogenic volatile organic compound emissions evidence from long-term forest inventory data DREW W. PURVES JOHN P. CASPERSEN w PAUL R. MOORCROFT Ị GEORGE C. HURTT andSTEPHEN W. PaCaLA Department of EEB Princeton University Princeton NJ 08540 USA Faculty of Forestry University of Toronto 33 Willcocks Street Toronto ON Canada M5S 3B3 Department of OEB Harvard University 22 Divinity Avenue Cambridge MA 02138 USA Institute for the Study of Earth Oceans and Space University of New Hampshire 39 College Road Durham NH 03824-3525 USA Abstract Volatile organic compounds VOCs emitted by woody vegetation influence global climate forcing and the formation of tropospheric ozone. We use data from over 250000 re-surveyed forest plots in the eastern US to estimate emission rates for the two most important biogenic VOCs isoprene and monoterpenes in the 1980s and 1990s and then compare these estimates to give a decadal change in emission rate. Over much of the region particularly the southeast we estimate that there were large changes in biogenic VOC emissions half of the grid cells 1 X 1 had decadal changes in emission rate outside the range to for isoprene and outside the range for monoterpenes. For an average grid cell the estimated decadal change in heatwave biogenic VOC emissions usually an increase was three times greater than the decadal change in heatwave anthropogenic VOC emissions usually a decrease caused by legislation . Leaf-area increases in forests caused by anthropogenic disturbance were the most important process increasing biogenic VOC emissions. However in the southeast which had the largest estimated changes there were substantial effects of ecological succession which decreased monoterpene emissions and had location-specific effects on isoprene emissions harvesting which decreased monoterpene emissions and increased isoprene emissions and .

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