User Tools

Site Tools


field_methods:vegetation_plant_height

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Last revision Both sides next revision
field_methods:vegetation_plant_height [2014/02/09 14:43]
jgh
field_methods:vegetation_plant_height [2014/02/09 15:19]
jgh
Line 8: Line 8:
  
 ===== Introduction ===== ===== Introduction =====
-Vegetation height is measured as the height of the tallest plant part within a 30 cm (12 in) diameter cylinder projected tangent to the transect. ​ It is measured vertically from the soil surface at the center of the cylinder (Figure 17).  Vegetation height provides plot-level vertical structure information necessary to predict soil erosion from wind and characterize wildlife habitat. ​ Vegetation height is usually measured at the same time as [[line_point_intercept|line-point intercept]] because it is more efficient, but can be measured separately.  +Vegetation height is one of the methods contained within the //​Monitoring Manual for Grassland, Shrubland and Savanna Ecosystems// ​and is intended to support the additional methods described in the manual.  Click [[protocols:​monitoring_of_grassland_shrubland_and_savanna_ecosystems|here]] to for more information about the all of the methods in the //​Monitoring Manual//.
- +
-Vegetation height is one of the methods contained within the //​Monitoring Manual for Grassland, Shrubland and Savanna Ecosystems//​. ​ Click here to for a description of all of the methods in the manual.+
  
 ===== Method ===== ===== Method =====
-Plant height is measured with a graduated survey rod or measuring stick with a 30cm disc affixed to the top of the measuring tool.  An imagery cylinder ​extending ​from the disc's circumference to the ground ​forms a transect.  The highest point of any plant (living or dead) that falls within ​the transect ​is recorded. ​ Woody and/or herbaceous plants are differentiated. ​  If both woody and herbaceous plants are present ​within ​the transect, the tallest of each type of plant is recorded. ​ If no plants are present, a value of "​0"​ is recorded. ​ Transects are established at regular intervals (5m is recommended) with a minimum of 30 height measurements per plot.  ​+{{:​field_methods:​veg_height_1a.png}}\\ 
 +** A graduated rod and disc is used measure vegetation height. ** 
 + 
 +Plant height is measured with a graduated survey rod or measuring stick with a 30cm disc affixed to the top of the measuring tool.  An imagery cylinder ​extends ​from the disc's circumference to the ground. ​ The highest point of any plant (living or dead) that falls within ​this cylinder ​is recorded. ​ Woody and/or herbaceous plants are differentiated. ​  If both woody and herbaceous plants are present ​underneath ​the disc, the tallest of each type of plant is recorded. ​ If no plants are present, a value of "​0"​ is recorded. ​ Transects are established at regular intervals (5m is recommended) with a minimum of 30 height measurements per plot.  ​ 
 + 
 +{{:​field_methods:​veg_height_2a.png}} \\ 
 +** Example plots. ​ The black silhouette represents a woody species and the grey silhouette represents an herbaceous species. ** \\
  
 Once the data is collected, an average height of all species is calculated as well as an average height of woody species and herbaceous species. ​ Values of 0 (no vegetation present) can be discarded when calculating average heights if desired. Once the data is collected, an average height of all species is calculated as well as an average height of woody species and herbaceous species. ​ Values of 0 (no vegetation present) can be discarded when calculating average heights if desired.
field_methods/vegetation_plant_height.txt · Last modified: 2014/02/09 15:21 by jgh