SAMPLING VEGETATION ATTRIBUTES - New Mexico NRCS - US ...

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The frames are made of 3/8-inch iron rod and 1-inch angle iron or 1 1/4-inch x 3/16-inch flat iron. Place tines at the proper intervals along the rear of the frame and parallel to the sides to create quadrats of smaller sizes. It is convenient to have a 30-, 20-, 15-, 12-, 10-, 6-, and 3-inch quadrat available. These different size quadrats can be combined in three frames. The 30-inch and 15-inch quadrats can be combined in one frame. The 20-inch and 10-inch quadrats can be combined in one frame. The 12-inch, 6-inch, and 3-inch quadrats can be combined in one frame. 12 in. Rangeland Monitoring 12 in. Nested Plot Frame 3 in. 6 in. 3 in. 6 in. Illustration 7 METHODS—Frequency The ends of the tines (both front and rear) are tapered to points as illustrated. These points are used to collect cover data. 49
50 METHODS—Dry Weight Rank C. Dry Weight Rank Method 1. General Description The Dry Weight Rank method is used to determine species composition. It consists of observing various quadrats and ranking the three species which contribute the most weight in the quadrat. It is important to establish a photo plot (see Section V.A) and take both close-up and general view photographs. This allows the portrayal of resource values and conditions and furnishes visual evidence of vegetation and soil changes over time. 2. Areas of Use This method has been tested in a wide variety of vegetation types and is generally considered suitable for grassland/small shrubs types or understory communities of large shrub or tree communities. It does not work well on large shrubs and trees. 3. Advantages and Limitations a One advantage of the Dry Weight Rank Method is that a large number of samples can be obtained very quickly. Another advantage is that it deals with estimates of production, which allows for better interpretation of the data to make management decisions. It can be done in conjunction with frequency, canopy cover, or comparative yield methods. Because it is easier to rank the top three species in a quadrat, there is less observer bias. b The limitation with this technique is that, by itself, it will not give a reliable estimate of plant standing crop, and it assumes there are few empty quadrats. In many large shrub or sparse desert communities, a high percentage of quadrats are empty or have only one species present. The quadrat size required to address these concerns is often impractical. 4. Equipment The following equipment is needed (see also the equipment listed in Section V.A, page 31, for the establishment of the photo plot): • Study Location and Documentation Data form (see Appendix A) • Dry Weight Rank form (see Illustration 8) • Quadrat frame • Hammer • Permanent yellow or orange spray paint • One stake: 3/4 - or 1-inch angle iron not less than 16 inches long • Compass • Steel post and driver 5. Training Examiners must be able to identify the plants. Experience in weight estimate is desirable, but those with experience must break the habit of assigning percentages and just rank the species, as well as not debating over the close calls. The large number of sampling units tends to reduce the problems with close calls. 6. Establishing Studies a Site Selection The most important factor in obtaining usable data is selecting representative areas (critical or key areas) in which to run the study
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SAMPLING VEGETATION ATTRIBUTES INTE
Page 3 and 4:
TABLE OF CONTENTS SAMPLING VEGETATI
Page 5 and 6: TABLE OF CONTENTS TABLE OF CONTENTS
Page 7 and 8: I. PREFACE PREFACE The intent of th
Page 9 and 10: 2 INTRODUCTION values when individu
Page 11 and 12: 4 INTRODUCTION represent the “pul
Page 13 and 14: 6 INTRODUCTION G. Coordination Moni
Page 15 and 16: 8 STUDY DESIGN AND ANALYSIS A. Plan
Page 17 and 18: 10 STUDY DESIGN AND ANALYSIS Macrop
Page 19 and 20: 12 STUDY DESIGN AND ANALYSIS Becaus
Page 21 and 22: 14 STUDY DESIGN AND ANALYSIS d From
Page 23 and 24: 16 STUDY DESIGN AND ANALYSIS b Cove
Page 25 and 26: 18 STUDY DESIGN AND ANALYSIS sideoa
Page 27 and 28: 4 3.5 3 2.5 20 5 STUDY DESIGN AND A
Page 29 and 30: 22 STUDY DESIGN AND ANALYSIS C. Oth
Page 31 and 32: 24 ATTRIBUTES Frequency is the numb
Page 33 and 34: 26 ATTRIBUTES 2. Advantages and Lim
Page 35 and 36: 28 ATTRIBUTES b Standing crop and p
Page 37 and 38: 30 ATTRIBUTES
Page 39 and 40: 32 METHODS—Photographs c Angle ir
Page 41 and 42: METHODS—Photographs Hinge Rod sta
Page 43 and 44: METHODS—Photographs angle iron st
Page 45 and 46: 38 METHODS—Frequency • One tran
Page 47 and 48: 40 METHODS—Frequency transected,
Page 49 and 50: 42 METHODS—Frequency (3) Total fr
Page 51: Page of Frequency 44 Study Number D
Page 55: METHODS—Frequency The frame is ma
Page 59 and 60: 52 METHODS—Dry Weight Rank After
Page 62 and 63: D. Daubenmire Method METHODS—Daub
Page 64 and 65: METHODS—Daubenmire b Ten Cover Cl
Page 66: Page of Daubenmire Study Number Dat
Page 70 and 71: 50 cm Six Cover Class Frame 20 cm R
Page 72 and 73: METHODS—Line Intercept b Pilot St
Page 74 and 75: METHODS—Line Intercept Hanley, Th
Page 77 and 78: 70 METHODS—Step Point F. Step-Poi
Page 79 and 80: 72 METHODS—Step Point the boot an
Page 81 and 82: 74 METHODS—Step Point measures AN
Page 85 and 86: 78 METHODS—Point Intercept G. Poi
Page 87 and 88: 80 METHODS—Point Intercept 8. Sam
Page 89 and 90: 82 METHODS—Point Intercept b Tran
Page 91 and 92: METHODS—Point Intercept Examples
Page 93 and 94: 86 METHODS—Cover Board H. Cover B
Page 95 and 96: 88 METHODS—Cover Board g Study Do
Page 98: Page of Cover Board Method Profile
Page 101 and 102: 94 METHODS—Density I. Density Met
Page 103 and 104: 96 METHODS—Density (often very mu
Page 105 and 106: 98 METHODS—Density able to make s
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Page of Density Study Number Date E
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• Herbage Yield Tables for Trees
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METHODS—Double Weight Sampling (4
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METHODS—Double Weight Sampling d
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Page of Production Study Number Dat
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112 METHODS—Harvest K. Harvest Me
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114 METHODS—Harvest 7. Taking Pho
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116 METHODS—Comparative Yield L.
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118 METHODS—Comparative Yield (1)
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120 METHODS—Comparative Yield Tab
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M. Visual Obstruction Method - Robe
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METHODS—Visual Obstruction—Robe
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Sampling Interval Study Location 1
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130 METHODS—Other N. Other Method
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132 GLOSSARY browse: (1) the part o
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134 GLOSSARY grazable woodland: for
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136 GLOSSARY sample: a set of sampl
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138 GLOSSARY
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140 REFERENCES Crocker, R.L. and N.
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142 REFERENCES Hironaka, M. 1985. F
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144 REFERENCES Nie, Norman H., C. H
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146 REFERENCES Society for Range Ma
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148 REFERENCES Whitman, W.C. and E.
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Location 150 APPENDIX A Study Locat
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APPENDIX B APPENDIX B—STUDY AND P
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APPENDIX B 3. Label 3 A placard on
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APPENDIX C Photo Identification Lab
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160 APPENDIX C
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162 APPENDIX D The formula for usin
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Form Approved OMB No. 0704-0188 Pub
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