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ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

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Figure 7. -- Percentuge of annwz Z ectornycorrhizaZ activity measwed <strong>in</strong><br />

shaZZow m<strong>in</strong>eral soiZ and <strong>in</strong> organic matter of a22 types.<br />

Effect of Organic Matter on Ectomycorrhizal Activity<br />

Soil organic matter is usually the dom<strong>in</strong>ant substrate support<strong>in</strong>g ectomycor-<br />

rhizae <strong>in</strong> northern Rocky Mounta<strong>in</strong> forest soils. The degree of organic matter<br />

dom<strong>in</strong>ance over m<strong>in</strong>eral soil varies among sites (fig. 7). The total amount of<br />

active ectomycorrhizal root tips over a grow<strong>in</strong>g season also varies among sites.<br />

The quantity of ectomycorrhizal root tips <strong>in</strong> soil samples generally ref1 ects the<br />

relative productivity of the ecosystem (fig. 8). The Teton samples were taken on<br />

a s<strong>in</strong>gle date equivalent to the spr<strong>in</strong>g peak <strong>in</strong> activity of the Coram site (fig,<br />

9), and are not comparable to seasonal data from the other sites.

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