RAINFOR GEM Intensive Plots Manual (pdf) - University of Oxford

More documents

Recommendations

Info

The mesh size is 1.5 cm × 1.5 cm here (though smaller ~1 cm is also fine). If this mesh comes in rolls 1 m wide you can cut into 50cm (allow 10 cm for folding over the base of the core) × 43 cm (12 cm diameter 44 means 38 cm circumference plus a 5 cm overlap)pieces then tie up along the sides and base with ~1.1 mm diameter nylon fishing wire or plastic cable tie (making them like this youcan estimate 25 cores from 5 m of mesh).44 Metcalfe et al. (2008 a,b, 2009:§4.1.2.1.2) used ~14 cm diameter cores, but the ones in Peru are currently all 12 cm diameter. If youdo not use 12 cm diameter cores, remember to note the diameter and modify the equations in §2.1 accordingly.36
2.2 RhizotronsRoot observation pits with screen rhizotrons are a method for measuring surface root growth (≤30 cm depth) intropical field sites 45 , allowing more regular readings than in-growth cores (monthly as opposed to threemonthly)(Metcalfe et al. 2008a, Girardin et al. 2010). In the Kosñipata valley, Peru, we have found closeagreement between rhizotron and in-growth core methods (Girardin et al. 2010), but it is strongly advised toimplement both protocols.See Box 4 for how to construct rhizotrons.Rhizotron installationEquipment: 6 long (15 cm) nails per rhizotron (if using a metallic rhizotron made of MFCs, see Box 4), flatedged spade, broad hoe/pick axe, hammer, plastic sheets (~1 m 2 , e.g. bin-liners) and a metallic grid (~70 cm ×70 cm) to prevent animals (or people) falling into the rhizotron holeIdeally, installation should take place in the dry season otherwise high rainfall can soon erode the contactbetween the screen and the soil. If the plot is a regular square, install the rhizotrons in a 3 × 3 grid as shown (ifnot square, get as close to this as possible; also try to position the rhizotrons so as to avoid where the transectsfor coarse woody debris surveys will be placed - see §4.2). Because of foot traffic along the subplot edges,place the rhizotrons 1-2 m away from the edges (and the central one 1-2 m away from the middle). At therhizotron location, permanently mark a 1.0 m × 1.0 m exclusion area (e.g. with flagging tape) which shouldremain strictly disturbance-free no only during installation of the rhizotron but also afterwards (especially nocutting!). Using the spade and trowel, dig a rectangular hole in front of the exclusion area that is ~30 cm across(as close as possible to the exact width of the rhizotron), 50 cm long (length of a forearm + 10 cm) and ~40 cm45 Unfortunately, experience at the Wytham Woods plot, UK, has shown that this method is unsuitable for some clay-rich temperateplots because of the large amounts of soil contraction and expansion during the year. It is also problematic at sites with seasonallyshallow water tables.37
Page 1: Measuring Tropical ForestCarbon All
Page 5 and 6: ContentsTHE RAINFOR-GEM INTENSIVE C
Page 7 and 8: The RAINFOR-GEM Intensive Carbon Mo
Page 9 and 10: What are the RAINFOR-GEM protocols?
Page 11 and 12: Where can I get data from existing
Page 13 and 14: Two RAINFOR-GEM hectare plots in th
Page 15 and 16: 1.2 Setting out the plotSubplot cor
Page 17 and 18: An example surveying path (cf. Cond
Page 19 and 20: Required for jobs that can be sched
Page 21 and 22: Tree #487 in Fragment E plot where
Page 23 and 24: 1.4 Tagging small trees*** Note tha
Page 25 and 26: does, measure underneath the lean o
Page 27 and 28: Measuring a liana at three points i
Page 29 and 30: BOX 2: Five unusual trees.Example 1
Page 31 and 32: Example 3: Here is a large liana on
Page 33 and 34: 1.5 Tree heightTree height should b
Page 35 and 36: 1.6 Sketch map of the plotAt this p
Page 37 and 38: 2. BELOW GROUND MEASUREMENTSWe star
Page 39 and 40: Next, insert the cylindrical core i
Page 41: BOX 3: How to make an in-growth cor
Page 45 and 46: sure that it covers the hole but no
Page 47 and 48: An example rhizotron transparency f
Page 49 and 50: Analysis: First, calculate the sum
Page 51 and 52: A metallic rhizotron as in use at t
Page 53 and 54: 2.3 Coarse rootsNeither in-growth c
Page 55 and 56: 3. CO 2 EFFLUX3.1 Total soil CO 2 e
Page 57 and 58: 3.2 Stem CO 2 effluxFirst, choose t
Page 59 and 60: e related to stem growth) to check
Page 61 and 62: Equipment: IRGA and SRC-1, PVC coll
Page 63 and 64: Control No litter Double litterNo e
Page 65 and 66: the S3 hole. Finally, discard the l
Page 67 and 68: 3.4 Coarse woody debris (CWD) CO 2
Page 69 and 70: 4.2 Coarse woody debris (CWD) surve
Page 71 and 72: all of the large, marked wood piece
Page 73 and 74: Equipment: 25 litter traps per ha (
Page 75 and 76: this select the straight line drawi
Page 77 and 78: http://www.eci.ox.ac.uk/research/ec
Page 79 and 80: • The tripod is level so that the
Page 81 and 82: 8. WEATHER AND CLIMATELocal climate
Page 83 and 84: Luiz Aragão repairing an understor
Page 85 and 86: 10. DATA ENTRY AND SERVER UPLOADA c
Page 87 and 88: APPENDIX I: RAINFOR-GEM Fieldwork c
Page 89 and 90: APPENDIX II: How to use an EGM-4 In
Page 91 and 92: • Remember to change the switch i
Page 93 and 94:
CO 2 efflux calculationsWhile the E
Page 95 and 96:
The volume V airspace (stippled) be
Page 97 and 98:
CO 2 flux measurements with EGM: A
Page 99 and 100:
Downloading dataEGM memory can stor
Page 101 and 102:
APPENDIX III: Possible schedule of
Page 103 and 104:
Gerwing JJ, Schnitzer SA, Burnham R
show all

RAINFOR GEM Intensive Plots Manual (pdf) - University of Oxford

Create successful ePaper yourself

Delete template?

Save as template?