Analder carr is a particular type ofcarr, i.e. waterlogged wooded terrain populated withalder trees. They can be found across theUnited Kingdom, sometimes attractingash trees should they become drier.[1] Many have developed alongside streams in theNew Forest, where the Alder's capacity to thrive in a water logged environment allows them to become the dominant species of tree in these areas. The presence of particular bacteria,Frankia alni, enables their root systems to extractnitrogen from the air, thus making up for the lack of nitrogen in waterlogged soil.[2]
Alder carrs have often beencoppiced, whereby cutting away growth at ground level encourages new trunks to grow at ground level. This means the wood can be repeatedly harvested.[3] This wood can then be used to make water pipes, wooden pumps, as well as piles under bridges. Other uses have included charcoal for making gun powder, and filters forgas masks.[2]
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