Great Outdoors Earth Day - Trees, Lakes and Mountains A typical tree forest is composed of the overstory (canopy or upper tree layer) and the understory. The understory is further subdivided into the shrub layer, herb layer, and also the moss layer and soil microbes. In some complex forests, there is also a well-defined lower tree layer. Forests are central to all human life because they provide a diverse range of resources: they store carbon, aid in regulating the planetary climate, purify water and mitigate natural hazards such as floods. Forests also contain roughly 90 percent of the world's terrestrial biodiversity.
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標準授權 | 480 x 320 px | JPG | 13 點 |
標準授權 | 800 x 533 px | JPG | 15 點 |
標準授權 | 2121 x 1414 px | JPG | 18 點 |
標準授權 | 2738 x 1825 px | JPG | 20 點 |
標準授權 | 3464 x 2309 px | JPG | 22 點 |
標準授權 | 5760 x 3840 px | JPG | 23 點 |
標準授權 | 8146 x 5431 px | TIF | 39 點 |
進階授權 | 5760 x 3840 px | JPG | 88 點 |
進階授權 | 5760 x 3840 px | JPG | 88 點 |
進階授權 | 5760 x 3840 px | JPG | 88 點 |