project report no. 58, observed growth trends, average ... · based on these values, mal (mean...

Stephen F. Austin State UniversitySFA ScholarWorks

Informal Project Reports East Texas Pine Plantation Research Project

9-1997

Project Report No. 58, Observed Growth Trends,Average Total Height . . . Ten Tallest Trees, Loblollyand Slash Pine Plantations East TexasJ. David LenhartArthur Temple College of Forestry and Agriculture, Stephen F. Austin State University

Jennifer AllenStephen F. Austin State University

Young-Jin LeeStephen F. Austin State University

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Recommended CitationLenhart, J. David; Allen, Jennifer; and Lee, Young-Jin, "Project Report No. 58, Observed Growth Trends, Average Total Height . . . TenTallest Trees, Loblolly and Slash Pine Plantations East Texas" (1997). Informal Project Reports. Paper 15.http://scholarworks.sfasu.edu/etpprp_project_reports/15

OBSERVED GROWTH TRENDSAVERAGE TOTAL HEIGHT ... TEN TALLEST TREES

LOBLOLLY AND SLASH PINE PLANTATIONSEAST TEXAS

Jennifer AllenStudent Assistant

andYoung-Jin LeeGrsduate Student

J. David LenhartProfessor and ETPPRP Director

aI/located at Arthur Temple Col/ege of ForestrySFASU, Nacogdoches, TX, 75962

REPORT 58

Fromthe

East Texas Pine Plantation Research ProjectArthur Temple College of Forestry

SFASUNacogdoches, TX 75962

September ... 1997

c... Poge2 ...

Two Research Questions'.

What is the age of max~ mean annual increment - as measu.red byaverage total height of ten tallest trees?

Is the timdng influenced by site index?

The Data/The iJ\nalysia/The "Plottings

Observations from the East Texas Pine Plantation Research Project wereavailable for analysis in this study. We limdted the observations tosite index classes 60, 70 and 80 feet. And age classes were set atthree-year intervals.

For each combination of site index and age class, an average observedtotal height of the ten tallest trees was calculated.

Based on these values, MAl (mean annual increment) and CAI (currentannual increment) were calculated.

The values are depicted in graphs on the next six pages.

Loblolly: From examination of the first three graphs, itmaxLmum MAl tends to occur at about l~ years.does not appear to be affected by site index.

appears thatThe timing

Slash: In contrast, from examination of the last three graphs, itappears that maxLmum MAl occurs between 10-12 years, exceptfor site index class 60', where MAl steadily decreaseswith increasing age.

Por both species, the magnitude of tree height increases withincreasing site index.

For loblolly, the magnitude of MAI increases with increasing siteindex. However, that scenario is not evident for slash.

For both species, the character and nature of CAl is quite variable.

It may be concluded, after considering height growth trends, thatsite-specific managemant of planted pines in East Texas is probablyuseful to plantation managers.

OBSERVED AVERAGE TOTAL HEIGHT .... TEN TALLEST TREESLOBLOLLY PINE ... EAST TEXAS

SI 60 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 ,---------------------------,

1

15

14

13

12

11

10

9

8 H H-: -:)1 "7

6

5

4

3

2

.......0.. .

~ :.~- ~..... -..r ~ 'V"----o- ..,.

...D············-Q.. -----<>--.-<>"',"''0..

.~.~ ~Q _ {]

o

50

10

60

20

30

40

90

--- HEIGHT

80 ---0--- MAI

......-0-....... CAI..., 70.,..

o 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHTLOBLOLLY PINE

... TEN TALLEST TREESEAST TEXAS

SI 70 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 15

14

90 - HEIGHT

---0--': HAl 13

80 ---0--- CAl 12

..., 11.,.. 70

10..'" 60 9<!>H.,'" H H8 -: -:'"' 50 :>: U-:.. 70..., 40 6<!>

~., 5>-: 30

4

--0- •• _-0-20

----()...3~ ---0·_---c1- ---o- ___ -¢

.........'0- 2

10 "-"-~ 1

0 00 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHTLOBLOLLY PINE

... TEN TALLEST TREESEAST TEXAS

SI 80 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 15

- 14

90 HEIGHT

---0--- MAl 13

80 .......-0-....... CAl12..

OJOJ 11.. 70

10..'" 60C>H 9OJ

'" H H-: -:..,

50 8 :>: ()

::0.. 7

OJ 40C>

~ 6

~-: 305

~-:-::-:R. 4.., "-"<>20• " "---0-"--0-.

'0....-. ---0 •• - - "3"G-\102\/

0 10 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHT ... TEN TALLEST TREESSLASH PINE ... EAST TEXAS

SI 60 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 15

---+-- 14HEIGHT

90

---0--- MAr 13

80 ---0--- CAr12...,.,11.. 70

.. 10

'"" 60H

9.,'" H H,., 0< 0<0< 50 8 :>: U..0..

7., 40

"~ 6.,>0< 30

5

0.4

20 ..----o---~-_ 3

10--G---er--- '\.-<)

, 2b

0 1

0 2 4 6 8 10 12 14 16 18 20 22 2. 26 28 30

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHT ... TEN TALLEST TREESSLASH PINE ... EAST TEXAS

SI 70 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 15

14

90 --- HEIGHT

13--~O--- MAI

80 ----{}--- 12CAI.."" 11.. 70

10.."' 6.

"H 9

""' H H-: -:.., 5. 8 :0: tJ

-:..0.. 7

" 4.

"<:l 6

~ 3.5

42.

---cB":--~.--- ---- ---&:'---0- __......~ --<>-----0----_

03

,.~ 2

•"'0

1

• 2 4 6 8 ,. 12 14 16 18 2. 22 24 26 28 3.

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHT ... TEN TALLEST TREESSLASH PINE ... EAST TEXAS

SI 80 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.

100 15

14

90 --- HEIGHT

---0--- HAl 13

80 ',--0--,- CAl 12...,., 11.. 70

10..'" 60

"H 9.,'" H H

0< 0<

'" 50 8 :0: tJ0<..0.. 7., 40

"~ 6.,>0< 30

5

.¢' - - ::"R""-:,0-4

20- ~ - - - - - -0-._

D---~ --0-----03

.........10 '0---0

2

0 10 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

AGE CLASS - YEARS

OBSERVED AVERAGE TOTAL HEIGHT ... TEN TALLEST TREESSLASH PINE ... EAST TEXAS

SI 80 (BASE AGE 25 YEARS)

THREE OBSERVED PLANTATION PARAMETERS ARE PLOTTED.