are also recognized for their contribution to the health of the planet, as the decaying trees add nitrogen to the soil.
slender trunk of a fallen alder tree
wedged between rocks whipped
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
Parameter Estimates of the Regression Equation (1) for Estimation of the Above-Ground Biomass Production (kg [yr.sup.-1]) of Black Alder Trees
Fraction a b [R.sup.2] S.E.E.
Six red alder trees
were selected from an uncultivated site as representative specimens.
If conditions are still crowded when the aphids mature, they will migrate to other alder trees
, hence the dramatic fall in the population in midsummer, which is caused by an overcompensatory response to crowding, in which the majority of the population leaves the host tree.
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
? Allerton means "a town of Alder trees
", from the Old English "alder tun" - which had become "Alretune" by 1086 and Allerton by 1292.
This means the hay fever season starts with alder trees
releasing pollen in January and continues right up until the last of the nettle pollen disappears in late September.
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.'
In most of Southeast Alaska, red alder trees
line the roads.
Crystal clear waters flow over a rumbling of rocks in these creeks, forming pools that reflect the shiny green leaves of alder trees