Forest system productivity is essential feature of forest ecology system.

林业系统生产力是林业生态系统最本质的特征之一。

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The result offers reference on protection forest system construction in small watershed.

这一结果为小流域尺度防护林建设提够了一定价值的参考依据。

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GPS is widely used in forest system and it is of the function of position, navigation and quadrature.

GPS在林业系统中的应用广泛，具有定位、导航、求积三大功能。

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The United States Forest Service soon had trees planted in some areas and a rough road system built.

VOA: special.2009.07.20

Niubeiliang, China, is located at the eastern segment of the Qinling Mountains, with a typical temperate broad-leaved mixed mountain forest system.

UNESCO: EDUCATION

During the past three years, USDA's conservation agencies, the U.S. Forest Service, the Natural Resources Conservation Service, and the Farm Service Agency, have worked with more than half a million farmers, ranchers and forest landowners to enroll record acres in conservation programs, have targeted conservation dollars to locally-driven conservation initiatives and have worked to increase conservation and restoration activities on the 193 million acre National Forest system.

WHITEHOUSE: The White House

But we need to step back out of the trees, look at the forest and question the financing system we have created.

WSJ: What Are Accountable-Care Organizations, and Will They Improve Health Care?