文档介绍：Predicted increases in temperature and drought in ing century may make it more difficult for conifers(松柏类) such as ponderosa pine(杰克松) to regenerate after major forest fires on dry, low-elevation sites, in some cases leading to conversion of forests to grass or shrub lands, a report suggests. Researchers from Oregon State University concluded that moisture stress is a key limitation for conifer regeneration following stand-replacing wildfire, which will likely increase with climate change. This will make post-fire recovery on dry sites slow and uncertain. If forests are desired in these locations, more aggressive attempts at reforestation may be needed, they said.
 
The study, published in Forest Ecology and Management, was done in a portion of the Metolius River watershed in the eastern Cascade Range of Oregon, which prior to a 2002 fire was mostly ponderosa pine with some Douglas-fir and other tree species. The research area was not salvage-logged or replanted following the severe, stand-replacing fire.
 
"A decade after this fire, there was almost no tree regeneration at lower, drier sites," said Erich Dodson, a researcher with the OSU Department of Forest Ecosystems and Society. "There was some regeneration at higher sites with more moisture. But at the low elevations, it will be a long time before a es back, if it ever does."
 
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