Project Report No. 61, Observed Per-Acre Basal Area Growth Trends, 28 Individual Observations, Unthinned Loblolly Pine Plantations

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1 Stephen F. Astin State University SFA ScholarWorks nformal Project Reports East Texas Pine Plantation Research Project Project Report No. 61, Observed Per-Acre Basal Area Growth Trends, ndividal Observations, Unthinned Loblolly Pine Plantations Andrew M. Brrow Stephen F. Astin State University Follow this and additional works at: Part of the Other Forestry and Forest Sciences Commons Tell s how this article helped yo. Recommended Citation Brrow, Andrew M., "Project Report No. 61, Observed Per-Acre Basal Area Growth Trends, ndividal Observations, Unthinned Loblolly Pine Plantations" (199). nformal Project Reports. Paper 9. This Report is broght to yo for free and open access by the East Texas Pine Plantation Research Project at SFA ScholarWorks. t has been accepted for inclsion in nformal Project Reports by an athorized administrator of SFA ScholarWorks. For more information, please contact cdsscholarworks@sfas.ed.

2 SD _jl P55 {Z 1 1 OBSERVED PER-ACRE BASAL AREA GROWT TRENDS NDVDUAL OBSERVATONS UNTNNED LOBLOLLY PNE PLANTATONS EAST TEXAS From the East Texas Pine Plantation Research Project Arthr Temple College of Forestry SFASU Nacogdoches, TX 7596 Jly

3 ... Page... What is the age of maximm mean annal increment - basal area in sqare feet per acre? as measred by What is the inflence of site index on the timing of maximm mean nnpal increment? ow are these observations sefl to the forest manager? ndividal plot data from the East Texas Pine Plantation Research Project were available for analysis in this stdy. Each plot consists of two sbplots. Each sbplot is considered an observation. The analysis was limited to individal observations ages years and older. All observations are nthinned. /. For each observation, basal area in sqare feet per acre was calclated. Based on these vales, MA (mean annal increment) was calclated. The vales are depicted in graphs on the next twenty eight pages. From examination of the twenty eight graphs, it appears that maximm MA tends to occr between 1-17 years. Site index appears to have no inflence on the timing of maximm mean annal increment. And these observations are sefl to the forest manager... The above range of maximm MA vales cold be sed as possible gidelines for a first thinning, or a possible harvest schedle if short rotations with no thinnings are the management objective.

4 LOBLOLLY PNE ETPPRP - PLOT 006/SUBPLOT 1 - AGE = YEARS, STE NDEX = 7 FEET & TREES PER ACRE = lzl p:: Cil p:: 150 lzl Pol 1 E-t 1 lzl lzl o----- <7, 7 p:: lzl lzt 10 Cil lzl p:: p:: 1 6 lzl Pol 01 0 tl.l 90 5 Cil lzl 0 p:: 0 Cil..: Cil tl.l 60 Cil :Q PLANTATON AGE

5 LOBLOLLY PNE ETPPRP - PLOT 006/SUBPLOT AGE = YEARS, STE NDEX = 67 FEET & TREES PER ACRE = ll 1 E-t 1 Zt 10 1? > ll 01 0 t/ <> 5 t/.1 60 CC 3 Q PLANTATON AGE

6 LOBLOLLY PNE ETPPRP - PLOT 009/SUBPLOT 1 - AGE = 6 YEARS, STE NDEX = 76 FEET & TREES PER ACRE = ll ll Pot 1 o- --o, E-t ll ll 1 7 ll lzt 10 ll 1 -o 6 ll Pot ll 0.: PLANTATON AGE

7 LOBLOLLY PNE ETPPRP - PLOT 009/SUBPLOT AGE = 6 YEARS, STE NDEX = 73 FEET & TREES PER ACRE = Jzl Jzl ll 1 E-t 1.{)., Jzl Jzl Jzl o " 7 ; ---()" lzl 10 "0-----o Jzl 1 6 Jzl ll Jzl 0..: PLANTATON AGE

8 OBSERVED BASAL AREA PER ACRE LOBLOLLY PNE ETPPRP - PLOT 0/SUBPLOT 1 - AGE = YEARS, STE NDEX = 77 FEET & TREES PER ACRE = CJ P- 1,.... E-1 1 7, CJ Z to P ttl : ttl 60 3 JQ PLANTATON AGE

9 LOBLOLLY PNE ETPPRP - PLOT 0/SUBPLOT AGE = YEARS, STE NDEX = 76 FEET & TREES PER ACRE = Z CC 150 Z1 P 1. E-1 Z1 Z1 1 7 Z1,..t::> lzt 10 CC <:f,.. Z1 1 6 Z1 0 P fjl 90 5 CC Z1 0 CC..: CC fjl 60 CC PLANTATON AGE

10 LOBLOLLY PNE ETPPRP - PLOT 013/SUBPLOT 1 - AGE = YEARS, STE NDEX = 66 FEET &: TREES PER ACRE = tj 160 CC 150 ll 1 E o... o... 7, tj lzl, 10, CC,,,, or CC 0 CC..: CC CC eta 3 ll PLANTATON AGE

11 LOBLOLLY PNE ETPPRP - PLOT 013/SUBPLOT - AGE = YEARS, STE NDEX = 66 FEET &: TREES PER ACRE = Z Z1 1 E-1 1 Z1 Z1 7 Z1 lzl ,,, Z1,, 1,, 6 Z1 " Z1 0..::1 3 " PLANTATON AGE

12 LOBLOLLY PNE ETPPRP - PLOT 01/SUBPLOT 1 - AGE = 6 YEARS, STE NDEX = 6 FEET &: TREES PER ACRE = p:: p:: 150 Pot 1 E p:: lzl 10 p:: p:: 1 6 Pot p:: 0..:: PLANTATON AGE

13 LOBLOLLY PNE, ETPPRP - PLOT 01/SUBPLOT AGE = 6 YEARS, STE NDEX = 59 FEET & TREES PER ACRE = tj P 1 E tj Zt P Ol : 3 c:q PLANTATON AGE

14 LOBLOLLY PNE ETPPRP - PLOT 016/SUBPLOT 1 - AGE = 6 YEARS, STE NDEX = 6 FEET &: TREES PER ACRE = rzl p:: p:: 150 rzl P 1 E-1 rzl rzl 1 o , 7 rzl rzl " 1 o.. 6 rzl.... P.. Ol tt; 0 < c l.. 60 t PLANTATON AGE

15 LOBLOLLY PNE.. ETPPRP - PLOT 016/SUBPLOT AGE = 6 YEARS, STE NDEX = 55 FEET & TREES PER ACRE = Z Z1 flf 1 E-t 1 Z1 Z1 7 Z1 Zt 10 Z1 1 6 Z1 flf Z1 o"" <> PLANTATON AGE

16 LOBLOLLY PNE ETPPRP - PLOT 07/SUBPLOT 1 - AGE = YEARS, STE NDEX = 6 FEET &: TREES PER ACRE = : P: P: 150 1: 11 1 E-1 1: 1: 1 7 P: 1: lzl 10 1: P: P: 1 6 1: 11 Ot : P: 0..: JQ PLANTATON AGE

17 OBSERVED BASAL AREA PER ACRE LOBLOLLY PNE ETPPRP - PLOT 07/SUBPLOT - AGE = YEARS, STE NDEX = 65 FEET & TREES PER ACRE = p:; p:; 150 P. 1 E-t 1 7 p:; Z 10,0... ;... p:; p:; 1 o 6 P <> tjl 90 5 p:; 0..: tjl 60 3 f:q PLANTATON AGE

18 LOBLOLLY PNE ETPPRP - PLOT 050/SUBPLOT 1 - AGE = YEARS, STE NDEX = 73 FEET &: TREES PER ACRE = rz o , 150 rz1 Po E-1.. rz1 rz1 1 o, 7 rz1 rz rz1 1 6 rz1 Po rz1 0..:: PLANTATON AGE

19 LOBLOLLY PNE ETPPRP - PLOT 050/SUBPLOT AGE = YEARS, STE NDEX = 69 FEET & TREES PER ACRE = rz1 p:; o... p:; 150 rz1 1 E-t " rz1 rz1.. o... 7 p:; rz1... " Z 10 " o rz1 p:; p:; 1 6 rz rz1 p:; 0..: PLANTATON AGE

20 LOBLOLLY PNE ETPPRP - PLOT 075/SUBPLOT 1 - AGE = 6 YEARS, STE NDEX = 3 FEET &: TREES PER ACRE = «, 11 0 \ 1 p:; CC p:; o P- 1 E-t 1 7 p:; rz. 10 CC p:; CC p:; 0 CC CC CC CQ 3 p:; P PLANTATON AGE

21 LOBLOLLY PNE ETPPRP - PLOT 075/SUBPLOT AGE = 6 YEARS, STE NDEX = 77 FEET & TREES PER ACRE = f), 1,, fll o... E-t Jq fll fq PLANTATON AGE

22 LOBLOLLY PNE ETPPRP - PLOT /SUBPLOT 1 - AGE = 9 YEARS, STE NDEX = 7 FEET & TREES PER ACRE = fz1 p:: p:: 150 fz1 Po. 1 E-t 1 fz1 fz1 7 p:: fz1 0 lzt 10 fz1 p:: p:: 1 0, 6 fz1 Po o.. o 5 90 fz1 p:: 0..:: PLANTATON AGE

23 LOBLOLLY PNE ETPPRP - PLOT /SUBPLOT - AGE = 9 YEARS, STE NDEX = 6 FEET & TREES PER ACRE = p:t 9 tj 160 p:t 150 ll 1 E-t 1 7 p:t Z 10 p:t p:t 1 6 ll or 0.. o o p:t 0.: 3 r:r::a PLANTATON AGE

24 LOBLOLLY PNE ETPPRP - PLOT los/subplot 1 - AGE = 9 YEARS, STE NDEX = 7 FEET &: TREES PER ACRE = p:i p:i 150 ll 1 E p:i 0 Z 10 p:i p:i 1 6 ll Ol 0 fll 90 5 p:i 0.: fll 60 :Q PLANTATON AGE

25 LOBLOLLY PNE ETPPRP - PLOT los/subplot AGE = 9 YEARS, STE NDEX = 71 FEET & TREES PER ACRE = rz rz1 Po. 1 E- 1 rz1 rz1 7 rz1 "0... rz rz1 1 "<> 6 rz1 Po rz1 0 3 JQ PLANTATON AGE

26 LOBLOLLY PNE ETPPRP - PLOT 15/SUBPLOT 1 - AGE = YEARS, STE NDEX = 9 FEET & TREES PER ACRE = o_ Z1 p:; 9 \ CJ 160 \ \ 0 p:; Z1 1 \ E-1 Z1 Z1 1 7 p:; Z1 CJ Zt 10 Z1 p:; p:; 1 6 Z Z1 p:; 0 CQ PLANTATON AGE

27 LOBLOLLY PNE ETPPRP - PLOT 15/SUBPLOT - AGE = YEARS, STE NDEX = 6 FEET & TREES PER ACRE = Z1 p:: p:: 150 Z1 1 E- 0- Z1 Z p:: Z1 Zt 10 Z1... o p:: p:: 1 6 Z1 \ \ Ol <> Z1 p:: 0..: 3 C:Q PLANTATON AGE

28 LOBLOLLY PNE ETPPRP - PLOT 15/SUBPLOT 1 - AGE = 5 YEARS, STE NDEX = 6 FEET & TREES PER ACRE = lzl lzl Poi 1 E-1 1 lzl lzl 7 lzl 10 lzl 1 6 lzl Poi 01 0 o o lzl PLANTATON AGE

29 LOBLOLLY PNE ETPPRP - PLOT 15/SUBPLOT AGE = 5 YEARS, STE NDEX = 63 FEET & TREES PER ACRE = P 1 E Zt cr , P PLANTATON AGE

30 LOBLOLLY PNE ETPPRP - PLOT 19/SUBPLOT 1 - AGE = YEARS, STE NDEX = FEET &: TREES PER ACRE = ll ll P- 1 E-1 1 ll ll 7 ll Zt 10 ll 1 6 ll P ll 0..:,:Q PLANTATON AGE

31 LOBLOLLY PNE ETPPRP - PLOT 19/SUBPLOT - AGE = YEARS, STE NDEX = 6 FEET & TREES PER ACRE = p:: 1 9 CJ 160 p:: E-t 1 7 p:: CJ rz.. 10 p:: p:: p:: PLANTATON AGE