Lecture 3: Vegetation Sampling - Alaska Geobotany Center
Lecture 3: Vegetation Sampling - Alaska Geobotany Center
Lecture 3: Vegetation Sampling - Alaska Geobotany Center
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Point methods <br />
Sloping point frame to <br />
32.5% makes it least <br />
affected by foliage <br />
angle. Will increase <br />
values, but may provide <br />
beXer comparison <br />
between stands in some <br />
vegeta@on types. <br />
% cover<br />
Effect of point diameter: Ideal is infinitely small <br />
Percent cover measured by 100 pins<br />
100<br />
80<br />
60<br />
grass FESRUB<br />
40<br />
forb RANACR<br />
moss HYLSPL<br />
20<br />
0<br />
0 1 2 3 4 5 6<br />
Diameter of pin (mm)<br />
Shimwell 1972 <br />
• First hit is always recorded <br />
• Successive hits on same species recorded if interested in leaf area <br />
• Hits of other layers o_en recorded <br />
• Understory hit (usually moss layer) o_en recorded <br />
• Height can be recorded <br />
• Various liXer and bare categories can be defined
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