Some useful derivation and application of diameter frowth of commercial dipterocarp in the Basilan working circle

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Part of Forestry Leaves

Title: Some useful derivation and application of diameter frowth of commercial dipterocarp in the Basilan working circle
Language: English
Year: 1956
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Fulltext: Some Useful Derivation and Application of Diameter Growth of Commercial Dipterocarp in the Basilan Working Circle (From the first periodic growth data taken from six sample plots)* by MARTIN R. REYES Forester, Bureau of Forestry Growth is a basic data needed for determining the yield in a working circle to regulate the cut on a sustained yield basis. The table presented here summarizes some useful figures from the data gathered in six sample plots (one-hectare and 2-1/4hectare plots established in 1950 in a 22year old logged-over by steam donkeys, and two 1-hectare plots established in 1950 just after logging by tractors) in the southwestern. These plots were remeasured in 1954 and central western portions of the Basilan Working Circle. The derivations are briefly explained to serve as a simple guide in their use or preparation of similar tables for other forest tracts. Column (2)-These are the periodic annual growth in diameter (dbh or dab) in centimeters, reckoned at diameter class when first measured in 1950. These figures are derived from smoothed free-hand curves. From seedling to 35 cm. diameter class, the curve for plots established just after logging was used; from 40 cm. diameter class and over, the curve for plots established 22 years after logging was used. Total diameter increment of trees in dia. class (No. of trees) (No. of Yrs. between measurements) Example: For diameter class 30--Total diameter increment: 41.40 No. of trees considered: 15 15 x 4 PAI=-----41.40 .69 ems. actual, which was plotted; from smoothed, free-hand curve, .72 ems. Column (3), Years in class.- (For seedling to 5 cm.-dia. class, 11.4 years: this was derived by extending the curve to the zero line of the diameter class ordinate) . Column (4), Age at diameter class.years from seedling to a certain diameter class (Col. 3) are added and the sum is the estimated age at that diameter class. Example: To compute for years a 30-cm. tree stays in this class until it "graduates" to the next diameter class: Diameter class interval, 5 ems. Years in class PAI, .72 6.94 years *Established in 1950 by Foresters I. Achocoso, F. Asiddeo, L. Diez end R. Velbuene; remeasured in 1954 by Foresters M. Reyes, L. Diez end Rengers H. Esteves end J. Cruz. July, 1956 Page 65 Thus, age for 20 cm. class tree is found by Column (6), Number of years to reach summing up seedling-11.4, 5 cm. class- 50, 60 and 70 cm. diameter.9.09, 10 cm. class-8.62, 15 cm. dia. class30 8.06 and 20 cm. dia. class-7.58, which is Ex.: How long will it take a ' cm. 44.75 years. (Col. 1) residual to reach 60 Column (5), Diameter reached after 5, centim~ters in diameter? Add 10, etc. years. Ex.: What will be the appro- years m class. (Col.. 3) from ximate diameter of a residual 30 cm. dbh 30 cm: class lme until 35 cm. (Col._ 1) 30 year~ after logging? Add con"). class line. It is 33.88 years. secutively years ~n class. (Col. 3) from ai.ilii';J!, Some application of the derived figures olttas down the lme until a sum nearest '(j will be shown in the next issue. - · 30 years is reached; interpolate for year difference and add the centimer so found to the next diameter class. The sum is the diameter reached. Thus, sum of added years in class (Col. 3) from 30 cm. class nearest 30 years is 29.64 which is at line for 50 cm. class. The diameter (approx.) reached is the next line down, or 55 centimeters. Difference of 30 and 29.64 years is .36. .36 of 1.18 cm. increment rate at 55 cm. (Col. 2) is .42 cm. Adding .42 cm. to 55 cm. gives 55.42 cm. ,-Compliments of Gaton Lumber Mill Sawmill atSipalay, Neg. Occidente! Vic.ente B. Tan Balud, Masbate Dried Fish Dealer and General Merchant Yu Kim Chiong Balud, Masbate Dried Fish Dealer and General Merchant Page 66 George Bernard Shaw was having lunch in a London restaurant one day, when an orchestra struck up a particularly noisy tune. Without any intermission, it followed with another, Shaw called the head waiter and asked, "Does the orchestra play anything on request? "Yes sir," the man replied,'' Is there something you would like them to play?' "There is," said Shaw," Ask them to play dominoes until I have finished eating." JOSE LEE KONG M·anager Gen. Lucban St. Lucena, Quezon Andres Near lyam Bridge Si at Firewood Dealer Aloneros, Quezon I ----! Estelita 0. Pasamba 0. T. Licensee I Atimonan, Quezon I __ ! FORESTRY LEAVE~ (1) (2) Diameter PerioClass die ems. Annual (d.b.h. or Incred.a.b.) ment (Cm.) Seedling 5 .55 10 .58 15 .62 20 .62 2S .6'.) 30 .72 GROWTH FIGURES DERIVED FROM SAMPLE PLOTS IN LOGGED-OVER AREAS IN THE BASILAN WORKING CIRCLE . (FOR COMMERCIAL DIPTEROCARPS*) ill'NIV,ERSITY or TIIE PIIILIPPINES LIBRARY -------------------··---··-----------~~-~~=-=-=-·=='===============================-=-'--=-==-;===================-=·-~-=-=-~-~=-=-~-=(3) (4) Years Age at in Dia. Class Class 11.4 9.09 8.62 8.06 (Years) 11.40 20.49 29.11 37.17 5 10 7.75 10.53 12.91 15.86 18.10 21.28 Diameter lS 20 6.98 9.73 (Centimeters) 2S 30 (S) Rerched 3S 40 45 y A f t c r SO SS 60 E A R s (6) Number of Years to Reach 65 70 75 80 85 90 95 100 Diameter class: 50 cm. 60 cm. 70 cm. 12.62 15.55 18:6s 21.87 . 25.17 29.62 32.16 35.78 39.48 43.S8 48.13 53.24 S8.97 65.29 72.26 79.70 76.97 85.88 93.44 13.43 16.42 19.52 22.80 26~14 29.59 33.17 36.82 40.59 44.74 49.46 54.74 60.67 67.21 74.29 81.87 89.78 98.03 65.S7 74.48 82.04 ·----18.96 22.19 25.51 28.96 32;51 36.15 39.85 43.98 48.59 53. 77 S9.54 65.96 72.97 80.45 88.33 96.51 104.99 56,48 65.39 72.95 24.58 28.01 31.52 35.13 38.83 42.84 47.28 52.29 57.92 64.13 70.97 78.3S 86.12 95.87 102.63 47.86 56.77 64.33 7.58 44.75 23.30 26.67 30.12 33.72 37.39 41.23 45.44 50.21 SS.63 61.65 68.26 75.42 83.07 91.03 99.33 39.80 48.71 56.27 7.2S S2.00 28.45 31.98 35.60 39.30 43.37 47.89 5198 58.67 64.95 71.96 79.32 87.14 95.27 104.33 32.22 41.13 48.69 -------------------6. 94 58.94 33.60 37.26 41.09 45.28 50.03 55.42 63.03 75.17 82.81 90.75 99.05 24.97 33.88 41.44 - - - - - - - - - - - - - - - - - - - - - - - - - - -----------------------------35 .74 6.75 65.69 38.70 42.70 47.12 52.11 57.71 63.92 78.10 85.84 93.94 102.34 18.03 26.94 34.50 ---------~-------------------------- --+----------------------------------------------------------40 .83 45 .95 50 1.07 55 1.18 6.02 S.26 4.67 4.24 71. 71 44.15 48.78 53.98 59.78 66.23 73.26 88.65 96.8S 11.28 20.19 27.75 76.97 49.75 5S.08 61.07 67.63 74.74 82.36 91p8 98.56 5.26 14.17 21.73 ----------------------------------------------------------81. 64 s5.39 61.40 67.99 75.12 82.76 90.71 99.oo 119,93 8.91 16.47 8S.88 60.97 67.SS 74.64 82.25 90.16 98.44 -:: 4.24 11.80 ·, 60 1.28 • 3.91 89.79 66.49 73.54 81.06 88.9S 97.17 .I 124.66 7.56 6S 1.37 3.6S 93.44 71.96 79.38 87.21 9S.34 103.80 !' 3.65 70 1.4S 3.4S 96.89 77.34 85.0S 93.12 101.49 7S i.5\ 3.31 100.20 82.63 90.57 98.86 , 80 1.S6 3.21 103.41 87.86 96.03 104.SO 8S 1.60 3.13 106.S4 93.07 101.44 90 1.64 3.0S 109.S9 98.28 9S 1.68 2.98 112.S7 103.4S 100 1.71 2.92 llS.49 * Tangile, AiiJin, White Lauan, Mayapis, Kalunti, Manggasinoro. (Nato also included). Acknowledgment: Curve and readi*&s by Forester E. T. Tagudar; computations by Forester D. Antonio and Ranger F. isarrer. PRICES. OF LUMBER (DIPTEROCARP SPECU ~.S ONLY) AVERAGE MONTHLY WHOLESALE PRICE (BY PRODUCERS) AVERAGE MONTHLY WHOLESALE PRICE PER T HOUSAND PER THOUSAND BOARD FEET OF LUMBER (ROUGH) FOR BOARD FEET OF LUMBER (ROUGH) FOR THE lf'ERIOD PERIOD FROM JULY, 1955 TO MAY, 1956 FROM JULY, 1955 TO MAY, 1956. MONTH A pi tong R. L. Tang. Palo. W. L. Maya. A pi tong R. L. Tang. Palosapis w. L. Guijo Yiakal Narra 1955 July ....................... P175 i"200 i"200 P175 i"175 P175 P182 P240 P245 P182 P210 ~305 'P~05 P600 August .......... ·········· 175 210 210 175 175 175 177 197 220 200 195 330 73 600 - September ·········· ....... 165 200 200 165 165 165 176 206 226 186 203 320 76 600 · - - - October ................... 178 210 210 178 175 175 177 200 220 190 190 326 76 600 November ................ 175 210 210 175 175 175 185 215 227 193 Wl 339 90 600 December ................. 175 210 210 175 175 175 181 230 215 195 192 330 75 600 ,_ 1956 January ····· .............. 180 210 210 180 180 180 200 222 217 205 195 325 28 600 February .................. 180 210 210 180 180 180 195 218 218 195 195 323 ~4 650 March .................... 185 220 220 185 185 185 218 227 220 196 202 331 1132 650 April ..................... 185 220 220 185 185 185 195 216 217 202 185 320 25 650 May .. ... . .. . .. ... ... ..... 185 220 220 185 185 185 195 216 217 202 185 320 ~5 650 Note: The data contained herein are gathered from sources believJ to be reliable. I AVERAGE MONTHLY RETAIL PRICE PER THOUSAND BOARD FEET Apitong R. L. P220 P260 205 243 213 241 207 24:7 210 250 218 250 221 249 224 252 22_5 250 220 247 220 247 OF LUMBER (ROUGH) FOR THE PERIOD FROM JULY, 1955 TO MAY, 1956. Tang. Palo. P265 P200 238 212 241 215 247 207 245 210 238 220 249 227 252 221 249 220 247 226 247 226 W. L. Guijo Yakal Narra i."'220 P335 P435 P650 215 346 450 650 199 346 447 650 210 245 447 650 220 244 450 650 217 347 453 650 221 348 458 650 218 249 454 650 219 348 452 652 215 345 449 650 215 345 • 449 650 Prepared by MANUEL R. CASTRO Div. Forest Concessions and Sawmills