Vở Bài Tập Tiếng Anh 8 Tập 2

Water, air, and soil are three natural resources that we cannot live sầu without. The Forest Service strives to protect, maintain, and restore these valuable assets now và into the future.

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Water is one of the most important natural resources flowing from forests. The Forest Service manages the largest single source of water in U.S., with about one-fifth originating from 193 million acres of lvà which provides drinking water lớn 180 million people every day.

Soil provides nutrients, water, oxyren và heat lớn natural l& areas. Understanding the ability & capathành phố of soil lớn support an ecosystem plays an important role in lvà management decisions.

Air is a third critical resource for humans, plants, animals and all other organisms within a natural area. Air must be monitored in order khổng lồ control và lower pollution levels, control smoke caused by wildland fires, & to lớn monitor air quality. The Forest Service monitors the effects of air pollution that may impair visibility, harm human health, injure trees and other plants, acidify or cause unnatural fertilization of streams và lakes, leach nutrients from soils, and degrade cultural resources, lượt thích archeological sites & historical buildings. Forest activities that can affect air quality such as prescribed burning, ski areas, và mining are also monitored khổng lồ ensure compliance with air regulations for human health & lớn monitor possible impacts lớn natural resources.

What research is being conducted to lớn protect these natural resources?

Retìm kiếm on water, air và soil provides scientists with information about these critical natural resources, how they are changing, and what is affecting them. Forest Service Research and Development focuses on the following four focus areas involving water, air và soil:

Basic Processes

This retìm kiếm focus area strives to underst& the basic processes of water, air & soil & how they are affected by many disturbances including fire, drought, invasive sầu species và more.

Climate Change Impacts

This retìm kiếm focus area looks at the long term effects of climate change on the water, air và soil within a natural area. Pollution added lớn an atmosphere, water, or soil will directly or indirectly affect a natural area, either immediately or in the future.

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Extreme Event Effects

This retìm kiếm focus area examines how extreme events, including storms, fire, invasive species, và more, have sầu on the water, air và soil in a natural area. Scientists also look at the effects of these events on watersheds located in the forest or grassland.

Watershed Management Tools

These tools help natural resource managers, planners, và landowners decide how to manage forest & grassl& watersheds. Watershed Management Tools can also be used to educate the general public about ways khổng lồ protect and improve watersheds.

Current Research Highlights

Effects of Drought on Forests and Rangelands in the United States

In simple terms, drought is a laông chồng of water over a given temporal and spatial scale. Drought can be a severe natural disaster with substantial social & economic consequences. Historical and paleoclimatic evidence shows that drought has always impacted the physical environment và will continue to vì so. Management actions can either mitigate or exacerbate the effects of drought. As drought regimes change, the ability to quantify and predict the impacts on forests and rangelands is critical to lớn developing and implementing management actions lớn increase resiliency and adaptation.

Nitrogene Deposition Effects in California and the Pacific Northwest

This retìm kiếm study focuses on proposing strategies that will mix limits on power plants, cars, farms và other industrial processes in order to slow down the effects & production of acid rain, algal blooms và mercury. The amount of mercury found in plants & animals is continuing khổng lồ rise to toxic levels making it extremely dangerous lớn the infected plant or animal as well as any higher cấp độ food chain animals that may eat it. Scientists are proposing these levels based on scientific retìm kiếm they have been conducting involving observation of tree-inhabiting lichens và diatoms, a tiny single-cell algae that is very sensitive sầu lớn changes in nitrogen levels.