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Effects of Land Management Practices on Plant Invasions in Wildland Areas 159<br />

Removal of<br />

Undesirable Species<br />

Management<br />

Treatments<br />

Revegetation of<br />

Desirable Species<br />

Primary Effects<br />

Plant Populations & Communities<br />

Non-Target<br />

Undesirable Species<br />

Target Undesirable<br />

Species<br />

Target Desirable<br />

Species<br />

Non-Target Desirable<br />

Species<br />

Higher-Order Effects<br />

Animal Populations &<br />

Communities<br />

General Species<br />

Higher-Order Effects<br />

Ecosystem Structure & Function<br />

Soil<br />

Condition<br />

Water<br />

Balance<br />

Listed & Sensitive<br />

Species<br />

Fuels & Fire<br />

Regime<br />

Fig. 9.5 Conceptual model linking vegetation management treatments with primary and<br />

higher-order effects<br />

difficulties may be encountered when vegetation management is prescribed<br />

to benefit other ecosystem properties, or populations of listed and sensitive<br />

wildlife species.<br />

9.5 Conclusions<br />

The processes that affect plant invasions can vary widely, so much so that unifying<br />

principles have been difficult to identify. The guidelines presented in<br />

this chapter focus on two factors, resource availability and propagule pressure,<br />

which can be used to provide a coarse-scale assessment of the invasion

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