Fallen trees also provide bird and animal shelter, increase waterholding capacity of the soil, and recycle nutrients back into the environment through decomposition.
倾倒的树木也为鸟类和动物提供了栖息的场所，同时维系了水土，经过议定物质分解，将营养成分循环操纵。
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Where 50-kilogram king salmon once fought their way up waterfalls to lay their eggs in gravel beds, there now are only concrete walls holding back still water and deep beds of muddy deposits.