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

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Record weights of all plants within the vertical projection of the quadrat even though the base is not within the quadrat. Weight Estimate Quadrat Illustration 23 METHODS—Double Weight Sampling Do not record weights of portions of plants outside the vertical projection of the quadrat even though the base is within the quadrat 111
112 METHODS—Harvest K. Harvest Method 1. General Description The concept of this method is to determine the amount of current-year above-ground vegetation production on a defined area. The following vegetation attributes are monitored: • Peak standing crop, which is the above-ground annual production of each plant species • Species composition by weight 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 can be used in a wide variety of vegetation types. It is best suited for grasslands and desert shrubs. It is not well suited to large shrub and tree communities. 3. Advantages and Limitations a The harvest method measures the attribute historically used to determine the capabilities of an ecosystem. b It provides the basic data currently used for determining ecological status. c Seasonal and annual fluctuations in climate can influence plant biomass. d Measurements can be time-consuming. e Current year’s growth can be hard to separate from previous years’ growth. f Accurate measurements require collecting production data at peak production periods which, are usually short, or using utilization and phenology adjustment factors. g Green weights require conversion to air-dry weights. h In most areas, the variability in production between quadrats requires the sampling of large numbers of quadrats in order to detect reasonable levels of change. 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) • Production form (Illustration 22, page 109) • Sampling frames or hoops • One stake: 3/4- or 1-inch angle iron not less than 16 inches long • Herbage Yield Tables for Trees by Height, DBH, or Canopy
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SAMPLING VEGETATION ATTRIBUTES INTE
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TABLE OF CONTENTS SAMPLING VEGETATI
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TABLE OF CONTENTS TABLE OF CONTENTS
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I. PREFACE PREFACE The intent of th
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2 INTRODUCTION values when individu
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4 INTRODUCTION represent the “pul
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6 INTRODUCTION G. Coordination Moni
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8 STUDY DESIGN AND ANALYSIS A. Plan
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10 STUDY DESIGN AND ANALYSIS Macrop
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12 STUDY DESIGN AND ANALYSIS Becaus
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14 STUDY DESIGN AND ANALYSIS d From
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16 STUDY DESIGN AND ANALYSIS b Cove
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18 STUDY DESIGN AND ANALYSIS sideoa
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4 3.5 3 2.5 20 5 STUDY DESIGN AND A
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22 STUDY DESIGN AND ANALYSIS C. Oth
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24 ATTRIBUTES Frequency is the numb
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26 ATTRIBUTES 2. Advantages and Lim
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28 ATTRIBUTES b Standing crop and p
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30 ATTRIBUTES
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32 METHODS—Photographs c Angle ir
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METHODS—Photographs Hinge Rod sta
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METHODS—Photographs angle iron st
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38 METHODS—Frequency • One tran
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40 METHODS—Frequency transected,
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42 METHODS—Frequency (3) Total fr
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Page of Frequency 44 Study Number D
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METHODS—Frequency The frame is ma
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50 METHODS—Dry Weight Rank C. Dry
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52 METHODS—Dry Weight Rank After
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D. Daubenmire Method METHODS—Daub
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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
Page 107: Page of Density Study Number Date E
Page 110 and 111: • Herbage Yield Tables for Trees
Page 112 and 113: METHODS—Double Weight Sampling (4
Page 114 and 115: METHODS—Double Weight Sampling d
Page 116: Page of Production Study Number Dat
Page 121 and 122: 114 METHODS—Harvest 7. Taking Pho
Page 123 and 124: 116 METHODS—Comparative Yield L.
Page 125 and 126: 118 METHODS—Comparative Yield (1)
Page 127 and 128: 120 METHODS—Comparative Yield Tab
Page 130 and 131: M. Visual Obstruction Method - Robe
Page 132 and 133: METHODS—Visual Obstruction—Robe
Page 134: Sampling Interval Study Location 1
Page 137 and 138: 130 METHODS—Other N. Other Method
Page 139 and 140: 132 GLOSSARY browse: (1) the part o
Page 141 and 142: 134 GLOSSARY grazable woodland: for
Page 143 and 144: 136 GLOSSARY sample: a set of sampl
Page 145 and 146: 138 GLOSSARY
Page 147 and 148: 140 REFERENCES Crocker, R.L. and N.
Page 149 and 150: 142 REFERENCES Hironaka, M. 1985. F
Page 151 and 152: 144 REFERENCES Nie, Norman H., C. H
Page 153 and 154: 146 REFERENCES Society for Range Ma
Page 155 and 156: 148 REFERENCES Whitman, W.C. and E.
Page 157: Location 150 APPENDIX A Study Locat
Page 160 and 161: APPENDIX B APPENDIX B—STUDY AND P
Page 162 and 163: APPENDIX B 3. Label 3 A placard on
Page 164 and 165: 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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