خيارات البحث
النتائج 1 - 10 من 41
Persistent effects of ozone on needle water loss and wettability in Norway spruce.
1990
Barnes J.D. | Eamus D. | Davison A.W. | Ro Poulsen H. | Mortensen L.
Throughfall and canopy interactions in five different tree species in Denmark
2002
Hansen, K. | Bastrup-Birk, A. | Hovmand, M.F. (Danish Forest and Landscape Research Institute, Hoersholm (Denmark))
Acidification of forest soils is dependent on the tree species for several reasons. One reason is that the deposition to deciduous tree species normally is considered lower than to coniferous tree species. This study therefore considers the differences in deposition to different tree species in Denmark. Canopy throughfall and precipitation were collected during the period 1986 to 1999 at three trial species experimental sites in Denmark. At each site the species Norway spruce, sitka spruce, Douglas fir, beech and oak were studied. The paper presents and discusses the differences in canopy exchange processes and dry deposition in different tree species and at different locations
اظهر المزيد [+] اقل [-]Forms - an integrated forest monitoring system in Denmark
2002
Bastrup-Birk, A. | Johannsen, V.K. (Centre of Forest, Landscape and Planning, Hoersholm (Denmark))
A FORest Monitoring System (FORMS) has been implemented in Denmark in order to gain and deliver knowledge and information for operational and strategic decisions concerning nature and environment. FORMS integrate four national monitoring programmes. Forest condition monitoring is performed on 52 permanent plots distributed on a 16 x 16 km grid. FORMS gives a systematic and representative assessment of the resources in and development of the forests in Denmark, includes the monitoring of important processes in the forest ecosystem and follows the use of forest for recreational purposes
اظهر المزيد [+] اقل [-]Origin and structures of groundwater humic substances from three Danish aquifers [DOM, Dissolved Organic Matter]
1995
Groen, C. | Wassenaar, L. | Krog, M.
Calculation of water and element fluxes in a sandy forest soil taking into account the input variability
1995
Beier, C.
Natural attenuation of xenobiotic compounds: anaerobic field injection experiment [Grindsted landfill]
1995
Ruegge, K. | Bjerg, P.L. | Mosbaek, H. | Christensen, T.H. (Danmarks Tekniske Univ., Lyngby (Denmark). Grundvandscentret)
Degradation of pesticides in the unsaturated zone of soil
1995
Anderson, J.P.E.
Use of chemical indicators in determining aquifer vulnerability to contamination by pesticides
1995
Ramsay, L.
Monitoring preferential leaching of herbicides at a tile drained field plot
1995
Michaelsen, J.
Migration of pesticides in fractured clayey till at water saturated conditions
1995
Joergensen, P.R. | Hansen, M. | Spliid, N.H.