are also recognized for their contribution to the health of the planet, as the decaying trees add nitrogen to the soil.
School textbooks may feature bean plants in the diagram of nitrogen fixation, but the Frankia genus of bacteria evoke nodules in un-beanish plants, such as alder trees
The library's gardener now dons a hard hat while working near the alder trees
, as do the library assistants who empty the book drops in the employee lot.
In wetter areas, alder trees
are flourishing, providing a valuable food supply for siskins and redpolls.
Energy supplied to the rhizosphere supports the growth of microorganisms, which in turn enables the alder trees
to utilize physically limited nutrient sources in the soil.
Prince Charles wanted the kitchen cupboards made from home-grown oak and the floor made of tiles crafted from 100-year-old alder trees
Without going into any more detail, the loo directs liquids in the direction of reed beds where willow and alder trees
help in the filtration system, the trees later becoming materials on rural skills courses at the centre, and solids to the compost bins.
This will replace one large poplar, plus birch, mountain ash, and alder trees
Six red alder trees
were used in this investigation and a collaborative anatomical study by Oregon State University (OSU).
A closer look over several visits revealed that Clearwater Marine was actually harvesting an underwater stand of western redcedar, hemlock, white fir, cottonwood, maple, and alder trees
The presence of ancient, pollarded alder trees
suggest that the early settlers created a landscape of thickets of woodland, glades, pasture and meadows.
, which used to be coppiced to make charcoal and clogs, have been thinned out so that light gets to the water and more vegetation grows.
Campaign spokesman Shaun Russell said: 'The idea is to create a 'really rubbish' wood with willow and alder trees
growing in a 1,200 square metre plot next to the park's lake.