An Assessment and Management Protocol for Arundo donax in the Salinas Valley Watershed by Alana J....
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Transcript of An Assessment and Management Protocol for Arundo donax in the Salinas Valley Watershed by Alana J....
An Assessment and Management Protocol for
Arundo donax in the Salinas Valley Watershed
by Alana J. OakinsMay 2001
What is Arundo?
• invasive non-native species
• introduced in the 1800’s• rated 1 of 5 top species
of concern by CALEPPC• many associated
environmental problems
Why Should We Care?• out-competes
native vegetation• inability to
provide habitat and food for native species
• negatively affects stream flow and morphology
• water intensive
What can we do?
• federal, state and local “weed” laws (e.g. Clinton’s Executive Order and SB1740 & AB1168)
• economic and ethical implications to different stakeholders like landowners, agricultural community, and nurseries
• research (e.g. mapping studies)
Study Objectives
• to assess the feasibility of mapping Arundo using remote sensing
• to offer a policy recommendation for Monterey County
Assessing Arundo using Remote Sensing
• Why map Arundo?-it’s the first step-locating made easier-assess quantity-assess invasiveness-gives future direction
• Therefore…Can Arundo be differentiated from similar vegetation?
Methods• Acquired imagery…Color-IR• Groundtruthed the image • Created training classes • Trained computer in TnTmips
(MicroImages, 1999) • Supervised classification
ResultsTraining Class Statistics
35
50
65
80
95
110
125
140
Infrared Red Green
Band
Mean Arundo
Willow
-Arundo is significantly different than similar vegetation
• Mapped Arundo with an accuracy of 95%
LegendGreen-ArundoRed-WillowPink-CottonwoodPurple-OakYellow-Grasses and ShrubsWhite-Bare GroundDark Blue-Water (deep)Light Blue-Water (shallow)*Black polygons-groundtruth data and training classes
Discussion
• use a Color-IR • nominal pixel size of 2 m• supervised classification• red and green light
reflectance bands
A proposed policy…
• Arundo be included in the Monterey County Weed Management Plan
• funds be allocated for further Arundo research (e.g. mapping entire infestation)
An Effective policy...
• completely understand why Arundo even exists in Monterey County
• look to successful management examples as a guide
• public and private collaboration