A new study conducted in the Hawaiian Islands has revealed that landscape and erosion play crucial roles in determining soil fertility in tropical ecosystems.
"This study is the first to accurately predict the distribution of nutrients across a complex tropical forest landscape, and then to detect these shifts in nutrient status using airborne sensors," says Stanford University graduate student Stephen Porder, lead author of the study, which will be published in this weeks online edition of the Proceedings of the National Academy of Sciences (PNAS).
Porders co-authors are Carnegie Institution scientist Gregory P. Asner, an assistant professor (by courtesy) of geological and environmental sciences at Stanford; and Peter M. Vitousek, the Clifford G. Morrison Professor in Population and Resource Studies at Stanford. "Tropical soils often are assumed to be highly weathered and thus nutrient depleted," the authors write. But the study, which focused on the island of Kauai, revealed a complex "biogeochemical patchwork with almost equal areas of high and low nutrient availability."
Mark Shwartz | EurekAlert!
Safeguarding sustainability through forest certification mapping
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Dune ecosystem modelling
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Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...
Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers
Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...
Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
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27.07.2017 | Life Sciences
27.07.2017 | Life Sciences
27.07.2017 | Health and Medicine