Lecture 3: Vegetation Sampling - Alaska Geobotany Center

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Belowground biomass • Below ground harvest – Much more difficult to obtain. – In herbaceous vegeta@on several cores are take by taken by pressing a coring tube (e.g., 10-‐cm diameter) into the soil and extrac@ng soil containing roots. – The cores are washed to remove the soil. – Live from dead roots can some@mes be determined by color of the roots, or applica@on of tetrazolium salts. – Woody root systems may require excava@on and exposure of the root system in situ. • Root ingrowth bags – Numerous small nylon mesh bags of known diameter and volume are filled with soil and inserted into the ground. – These are retrieved at intervals, and the ingrown roots are removed and weighed. • Minirhizotrons – Photos taken at regular intervals along a tube inserted into the ground. PaXerns of fine roots are photographed at several @mes during the summer, and root growth is recorded on video. – Growth is obtained by taking periodic photos.
Minirhizotron apparatus Photo: Roger Ruess
Page 1 and 2:
Oct 17 schedule • 1 hour to
Page 3 and 4:
Subjec4ve vs. objec4ve sampling
Page 5 and 6: Objec4ve sampling approaches: Ra
Page 7 and 8: Plot sampling: The relevé meth
Page 9 and 10: Desirable quali4es of relevés:
Page 11 and 12: How would you sample this land
Page 13 and 14: Plot size Tables based on prev
Page 15 and 16: Example of a European relevé
Page 17 and 18: Strata (canopy layers) • Separ
Page 19 and 20: Vigor (rarely recorded) • Vigo
Page 21 and 22: Site-‐factor data form
Page 23 and 24: Soil descrip4on form (for those
Page 25 and 26: Cover The area of ground cover
Page 27 and 28: Es4ma4ng percentage cover • Ge
Page 29 and 30: Measuring Cover: Line intercept
Page 31 and 32: Advantages and disadvantages of
Page 33 and 34: Point methods Sloping point fra
Page 35 and 36: Point quadrat grid
Page 37 and 38: Point quadrat grid Walker, D.A.,
Page 39 and 40: Time-‐series results from Im
Page 41 and 42: Buckner sampler: Op4cal Sigh4ng
Page 43 and 44: Frequency • Expressed as a pe
Page 45 and 46: Tree height • The number of
Page 47 and 48: Tree height
Page 49 and 50: Biomass clip harvest 1 2 3 4 5 6 7
Page 51 and 52: Plant func4onal type sor4ng cat
Page 53 and 54: Clip Harvest • Normally, sever
Page 55: Biomass sampling in forests dbh
Page 59 and 60: Net primary produc4vity (NPP) N
Page 61 and 62: Inclined point frame 32.5˚ @lt
Page 63 and 64: Li-COR® LAI-2200 Plant Canopy Anal
Page 67 and 68: Source: Li-COR manual Correla4on
Page 69 and 70: Energy inputs to the top of t
Page 71 and 72: Different vegeta4on types have
Page 73 and 74: Some reflectance spectra The ce
Page 75 and 76: Satellites measure reflectance i
Page 77 and 78: Normalized Difference Vegeta4on
Page 79 and 80: Biomass and LAI vs. total summ
Page 81 and 82: AVHRR false-‐Color infrared
Page 83 and 84: Eurasia Arctic Transect Plot-level
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Lecture 3: Vegetation Sampling - Alaska Geobotany Center

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