DNR weekend reading: Moderate amounts of slash favor Douglas-fir growth

Stavis Creek
The estuary where Stavis Creek flows into Hood Canal. DNR is restoring wetlands at Stavis Creek Natural Resources Conservation Area. Photo: DNR

Here are links to articles about natural resources, climate, energy and other topics  published recently by universities, scientific journals, organizations, and other sources:

US Forest Service–Pacific Northwest Research StationLogging Debris Gives Newly Planted Douglas-Fir Forests a Leg-Up
A new study led by the U.S. Forest Service’s Pacific Northwest Research Station found that retaining moderate levels of logging debris, also known as “slash,” helped to both directly and indirectly increase the growth rate of Douglas-fir seedlings replanted after harvest. The findings, which are among the first to speak to the benefits of second-growth logging debris, are published online in the journal Forest Ecology and Management.

University of California-DavisUC Davis researchers uncover earliest tobacco use in the Pacific Northwest
Native American hunter-gatherers living more than a thousand years ago in what is now northwestern California ate salmon, acorns and other foods, and now we know they also smoked tobacco — the earliest known usage in the Pacific Northwest, according to a new University of California, Davis, study.

Science DailyAmplified Greenhouse Effect Shaping North Into South
A comprehensive analysis of ground and satellite-based data by a team of scientists found that vegetation is growing more vigorously and spreading north. The study, published in the journal <em)Nature Climate Change, said that since the early 1980s, tall shrubs , trees and other vegetation once found at 57 degrees north  is spreading into former regions of tundra as far as 64 degrees north. The paper suggests that by the end of this century rising temperatures could lead to northward shifts of vegetation of more than 20 degrees latitude compared with the period 1951 to 1980.

Rice UniversityGround-level ozone falling faster than model predicted; pollution controls may be working better than anticipated

There is good news and better news about ground-level ozone in American cities. While dangerous ozone levels have fallen in places that clamp down on emissions from vehicles and industry, a new study from Rice University suggests that a model widely used to predict the impact of remediation efforts has been too conservative.

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