Sentences with phrase «by tall shrubs»

Not exact matches

Next to a field of walnut trees near the university, a row of tall shrubs planted by the researchers stretches for several hundred yards: western redbud, coffeeberry, gum plant, sage, coyote brush.

The Canadian system is dominated by the extreme cold tolerant tall shrubs and the 10 - year snowshoe hare and Canadian lynx cycle

Poison Control Campers, backpackers, and other outdoorsy types can steer clear of poison ivy, oak, and sumac by knowing how to identify each plant: Poison ivy typically has a woody, ropelike vine and three leaflets that turn green in the summer; poison oak shows off clusters of yellow berries and oaklike leaves (usually in clusters of three); and poison sumac is a rangy shrub that grows up to 15 feet tall, with seven to 13 smooth - edge leaflets.

2) High densities of reindeer managed by herders in northwestern Eurasia may be able to help check increases in shrub growth and height by concentrating grazing in existing low shrub areas before they grow taller.

But as warming turns tundra shrubs, which can be covered by snow, into tall trees, researchers fear that less light will be bounced back creating a feedback loop that will worsen climate change.

Thawing permafrost also delivers organic - rich soils to lake bottoms, where decomposition in the absence of oxygen releases additional methane.116 Extensive wildfires also release carbon that contributes to climate warming.107, 117,118 The capacity of the Yukon River Basin in Alaska and adjacent Canada to store carbon has been substantially weakened since the 1960s by the combination of warming and thawing of permafrost and by increased wildfire.119 Expansion of tall shrubs and trees into tundra makes the surface darker and rougher, increasing absorption of the sun's energy and further contributing to warming.120 This warming is likely stronger than the potential cooling effects of increased carbon dioxide uptake associated with tree and shrub expansion.121 The shorter snow - covered seasons in Alaska further increase energy absorption by the land surface, an effect only slightly offset by the reduced energy absorption of highly reflective post-fire snow - covered landscapes.121 This spectrum of changes in Alaskan and other high - latitude terrestrial ecosystems jeopardizes efforts by society to use ecosystem carbon management to offset fossil fuel emissions.94, 95,96