A wetland is a distinct ecosystem that is flooded by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The primary factor that distinguishes wetlands from terrestrial land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique anoxic hydric soils.Wetlands are considered among the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal species. Methods for assessing wetland functions, wetland ecological health, and general wetland condition have been developed for many regions of the world. These methods have contributed to wetland conservation partly by raising public awareness of the functions some wetlands provide.
圖片編號:
248242278
拍攝者:
Dialfaher
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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標準授權 | XS | 480 x 400 | JPG | 13 | |
標準授權 | S | 800 x 667 | JPG | 15 | |
標準授權 | M | 2309 x 1924 | JPG | 18 | |
標準授權 | L | 2449 x 2041 | JPG | 20 | |
標準授權 | XL | 3098 x 2581 | JPG | 22 | |
標準授權 | MAX | 3794 x 3162 | JPG | 23 | |
標準授權 | TIFF | 3265 x 2721 | TIF | 39 | |
進階授權 | WEL | 3794 x 3162 | JPG | 88 | |
進階授權 | PEL | 3794 x 3162 | JPG | 88 | |
進階授權 | UEL | 3794 x 3162 | JPG | 88 |
XS
S
M
L
XL
MAX
TIFF
WEL
PEL
UEL
標準授權 | 480 x 400 px | JPG | 13 點 |
標準授權 | 800 x 667 px | JPG | 15 點 |
標準授權 | 2309 x 1924 px | JPG | 18 點 |
標準授權 | 2449 x 2041 px | JPG | 20 點 |
標準授權 | 3098 x 2581 px | JPG | 22 點 |
標準授權 | 3794 x 3162 px | JPG | 23 點 |
標準授權 | 3265 x 2721 px | TIF | 39 點 |
進階授權 | 3794 x 3162 px | JPG | 88 點 |
進階授權 | 3794 x 3162 px | JPG | 88 點 |
進階授權 | 3794 x 3162 px | JPG | 88 點 |