Part B, Working Papers, February 1974 - Special Collections - US ...

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APPENDIX .1A Study of Succession from Shifting Cultivation to Forest ina Dry Evergreen Forest in Central ThailandThe Inland Forest Study Team was interested in succession from forestremoval for cropping to regenerated forest as part of Its concern for the impactof herbicides upon the forest of South Vietnam (SVN).It was known that muchof the area of the inland forest impacted by herbicides was secondary forest insome stage of conversion from active ray to older forest.It was apparent fromstudy of the aerial photographs of SVN and from on-the-ground observations ofsecondary forest treated with herbicide that,whereas these forests containedlittle or no commercial volume, they were in other ways more severely damaged thanwere the older forests.In some instances they were cleared by multiple sprayingsalmost as completely as were the mangrove forests.In others, many of the seedling,sapling and pole size growing stock was killed.It has been speculated that theextensive use of herbicides encouraged proliferation of non-tree pioneer plants,preventing the establishment of forest tree species.Many of these questions cannotbe answered until on-the-ground examination of impacted areas can be undertaken, andeven that after more time has passed in some instances.Since there is little information concerning recovery of inactive swiddenunder a variety of human Impacts and over a substantial period of time, It wasfelt that a study of forest fallow representing several periods since abandonmentmight be useful In assessing inland forest damage.Accordingly, Dr. Sabhasri andhis colleagues, who served as consultants to the Committee, made a study of severalswidden areas in Thailand In areas of dry dlpterocarp and dry evergreen forests.While these studies are comparable to only certain areas of SVN, they do provide abasts for interpreting some of the information obtained from photographic evidencerelated to South Vietnamese secondary forests.Some of the areas described were the subject of earlier description and11-14
evaluation.It was felt that an additional plot measurement would enhance theutility of the earlier data for the purposes of this study.IntroductionThis report is concerned with the study of the trend of changes in speciescomposition on areas abandoned after cultivation in a dry evergreen forest atSakaerat Experiment Station during December '972 and August 1973- Though thereare numerous abandoned areas with shifting agriculture throughout the country,rarely are they kept under observation.This study, therefore, attempted to.visualize the successional stages which have taken place in this forest type.Locale and MethodsA 20 x 20 meter quadrat was laid down in a dry evergreen forest about the endof 1967 to study plant succession. All plants in this quadrat were removed. Thedenuded quadrat lies at an altitude of k5Q meters above sea level.Soils werederived from sandstone and shales with clay loam texture.The drainage conditionwas good.The annual rainfall in this forest is lower than in the true rainforest, averaging about 1000mmper year.The full description of species composition of the original forest was madeby Smitlnand et al (1968) and Sabhasri et al. (1968).The common tree speciesfbund in this forest type were as follows: • Memcylon sp., Hopea ferrea, Hydnocarpus11licofolI us, Wai sura trichostemon, Aglala pi rifera, Canthium brunnescens, Syzg!urncum!nia, Llnociera mlcrostema, Li tsea chinensis, Lagerstroemia calculata, Grewi apanlculata, Dali urn cochni chinensis, Ixora sp., Melodorum furltiosum, Hal lotuspanlculatus, and Phoebe sp. Tree species were small to medium sized. Only 10percent of the trees are greater than 22 cm in diameter.In a one-hectare plotthere occurs about 55 tree species with 1,140 stems of DBH greater than 5 cm andabout 25 species of climbing plants.11-15
Page 1 and 2: Item D Number ^sse D Not ScannedAut
Page 3 and 4: THE EFFECTS OF HERBICIDES IN SOUTH
Page 5: I. Introduction
Page 8 and 9: such a manner as to permit Its exte
Page 10 and 11: for Cambodia east of the Mekong Riv
Page 12 and 13: Inhibited by the absence of a fores
Page 14 and 15: able to troops. They quickly may be
Page 16 and 17: activity as they and their predeces
Page 18 and 19: subjected to other military actions
Page 20 and 21: forest experiment stations in Thail
Page 22 and 23: SOUTH CHINA SEAFigure 1-2 Military
Page 24 and 25: References Cited(1) Gartuer, E. J.
Page 26 and 27: II.The History of Human Use of the
Page 28 and 29: Cambodian Inventory project says wi
Page 30 and 31: Cambodia's 33»700 square miles of
Page 32 and 33: It Js useful to examine some of the
Page 34 and 35: tree crown densities prior to the I
Page 36 and 37: Both cultivated areas and grassland
Page 40 and 41: The permanent denuded quadrat was o
Page 42 and 43: emoved. Ourlnq the 1
Page 44 and 45: trends are still directed toward dr
Page 46 and 47: Table II-l (cont. - 2)SpeciesTotal
Page 48 and 49: Table II-2Species abundance in seed
Page 50 and 51: Table II-3Species from sapling enum
Page 52 and 53: Table II-4 (Cont. - p. 2)SpeciesTot
Page 54 and 55: Table II-6Species abundance from sa
Page 56 and 57: Table II-7 (Cont. - p. 2)SpeciesTot
Page 58 and 59: (9) Nuttonson, M. Y., 1963.The phys
Page 60 and 61: A. Identification of Forest Feature
Page 62 and 63: Beforereviewing the methods by whic
Page 64 and 65: from that of temperate forests.The
Page 66 and 67: (Tectona grand is) can be readily s
Page 68 and 69: Swellengrebel (37) has found that u
Page 70 and 71: B. Comparison of use of Photogramme
Page 72 and 73: where H = tree height, CA = crown a
Page 74: coefficients were fairly high (r=0.
Page 77 and 78: therefore would be more easily Iden
Page 79 and 80: The third approach was to estimate
Page 81 and 82: dominantly terrestrial. This is due
Page 83 and 84: provide only a "very rough estimate
Page 85 and 86: C. Stem Diameter/Crown Diameter Rel
Page 87 and 88: without the factors of density and
Page 89 and 90:
existing Information from other cou
Page 91 and 92:
Analysis of covarlance was used to
Page 93 and 94:
obtained by many other investigator
Page 95 and 96:
Sampling grid9 x 18 » 162quadrats1
Page 97 and 98:
Table III-lNumber of Quadrats Havin
Page 99 and 100:
Mean number of dead12merchantable t
Page 101 and 102:
E. Errors in Tree Counting and Volu
Page 103 and 104:
Figure III-2J-shaped curve of Tree
Page 105 and 106:
the commercial trees are usually at
Page 107 and 108:
error is the smallesttrees which ha
Page 109 and 110:
Random ErrorEven if a well-trained
Page 111 and 112:
all but the random error by use of
Page 113 and 114:
11. _ 19S9. The Application of Aeri
Page 115 and 116:
31. Richards, P. W. 1952. The Tropi
Page 117 and 118:
I. INTRODUCTIONThe task of the fore
Page 119 and 120:
Figure IV-1DIAMETER-HEIGHT RELATION
Page 121 and 122:
Figure IV-2DIAMETER-HEIGHT RELATION
Page 123 and 124:
tuberculatus tree just discussed ha
Page 125 and 126:
In five-meter log components.The vo
Page 127 and 128:
volume at any given time, Is also a
Page 129 and 130:
concerning stand structure while es
Page 131 and 132:
following:total heights, inventory
Page 133 and 134:
species, thus increasing the utiliz
Page 135 and 136:
computed by the following integrati
Page 137 and 138:
D. Exploitable Merchantable Volume
Page 139 and 140:
TABLE IV-6. Exploitable Merchantabl
Page 141 and 142:
ased upon samples of species compos
Page 143 and 144:
METERS50 J4O J?METERS
Page 145 and 146:
extensively by man, they are not co
Page 147 and 148:
12 3VT - Z Z Aa.n.s .v.1=1 j=l ' '
Page 149 and 150:
Table IV-10. Volume SummaryType of
Page 151 and 152:
Table IV-12. Inventory Total Volume
Page 153 and 154:
Table IV-14. Inventory Merchantable
Page 155 and 156:
Table IV-16. Exploitable Merchantab
Page 157 and 158:
(8) Sandrasegaran, K. 1971."Height-
Page 159 and 160:
crop. If there is not a sufficient
Page 161 and 162:
B- Exploited hardwood forestsA larg
Page 163:
or even extensive areas of timber,
Page 167 and 168:
Vulnerability of forest stands to a
Page 169 and 170:
Table V-l. Crown Characteristics of
Page 171 and 172:
Study of the forests of South Vietn
Page 173 and 174:
the trees continued to grow.The tas
Page 175 and 176:
Having been satisfied that the prot
Page 177 and 178:
commercial species. That is, the de
Page 179 and 180:
Military Region 3.This step, theref
Page 181 and 182:
the number of loss model trees givi
Page 183 and 184:
per tree which is in agreement with
Page 185 and 186:
crownwood yields an estimate of woo
Page 187 and 188:
was not a responsibility of the Com
Page 189 and 190:
Figure V-lUnsprayed forest showing
Page 191 and 192:
Figure V-3Appearance of very old bo
Page 193 and 194:
manufacturing problems; production
Page 195 and 196:
of the overstoryforest cover except
Page 197 and 198:
extensive aerial reconnaissance and
Page 199 and 200:
total area, film j - obtained from
Page 201 and 202:
Table V-l. Basic Data Used in the L
Page 203 and 204:
Table V-2. Results of the loss Made
Page 205 and 206:
gains are rapid until some point af
Page 207 and 208:
species, and environmental conditio
Page 209 and 210:
use of resulting prediction equatio
Page 211 and 212:
transforms.Since there were several
Page 213 and 214:
The usual procedure in assay work p
Page 215 and 216:
Table 1 Herbicides and applications
Page 217 and 218:
Figure 2Response of Plnus lambertia
Page 219 and 220:
- 7(Dto c-D -Ioj?Id(Au>oa-.inO-hI01
Page 221 and 222:
c -\n>in o3 cr-maO c-» to3 rf.at o
Page 223 and 224:
The response of the Inland Forest o
Page 225 and 226:
Darrow, R. A., G. B. Truchulet, C.
Page 227 and 228:
Appendix V-3Inventory Model Descrip
Page 229 and 230:
Thfs procedure was programmed in Fo
Page 231 and 232:
41 3.4742 2.995 14.266 1.587 .078 .
Page 233 and 234:
APPENDIX V-4Computation of Nonmerch
Page 235 and 236:
ehave in response to herbicide trea
Page 237 and 238:
To obtain crown volume, assume crow
Page 239 and 240:
In order to deal in some detail wit
Page 241 and 242:
observation is that many of the tre
Page 243 and 244:
The April 1966 coverage gives no in
Page 245 and 246:
Much of the bombed area in the gene
Page 247 and 248:
Table VT-2The classification of lan
Page 249 and 250:
egetatlonClassTable VI-5 Percent of
Page 251 and 252:
Figure VI-2 Spray Hit Map for the S
Page 253 and 254:
VI !/Figure VI-4 1969 1:50,000 Phot
Page 255 and 256:
Figure VI-6 1967 Photography of the
Page 257 and 258:
vr-nFigure VI-7a Close Up of Road I
Page 259 and 260:
VI-23road 246Total trees relocated
Page 261 and 262:
Figure VI-11 1966 Photography of Va
Page 263 and 264:
VI-2/Figure VI-13 1966 Photography
Page 265:
- • flrW, >!f » •" "•**VI-2
Page 269 and 270:
The study of the inland forests of
Page 271 and 272:
use might appear to be very substan
Page 273 and 274:
This has been a problem for the for
Page 275 and 276:
If computed on the basis of 90 cubi
Page 277 and 278:
Both Flamm and Westing examine dama
Page 279:
References'. Catfnot, R. 1972. Biol
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