ABSTRACTS ON FOREST ECONOMY, YIELD AND INVENTORY

1) SOME INVESTIGATIONS ON FINANCIAL MATURITY OF POPLAR PLANTATION (P.X EURAMERICANA CV. I-214)

Year/Number: 1967/2                             ODC: 651.2:176.1 Populus.
Author(s): SERTMEHMETOGLU, Z., ACAR, O., BIRLER, A.S.

In this research work, the ages of maximum mean annual increment and the ages of maximum mean annual net revenues were calculated for "I-214" poplar plantations growing at different spacings.


2) INTRODUCTION TO ECONOMICS OF POPLAR CULTIVATION

Year/Number: 1968/3                             ODC : 762:652.55:176.1 Populus
Author(s): SERTMEHMETOGLU, Z., ACAR, O., BIRLER, A.S.

Poplar cultivation is a type of land use for wood production purposes. It has the objectives to produce maximum quantity of wood in suitable quality to meet the market demand and this way to secure the maximum profit for poplar grower. Poplar plantations should be established and maintained in accordance with the application of several operations through out the period of rotation which necessitate certain expenses. At the end of the period of rotation, the plantation can be harvested and sold. In this paper, soil rents (net revenue calculated with 7 % interest rate/bare land value) were estimated for plantations with "P.x euramericana I-214" for different spacings:


3) A STUDY ON THE ECONOMIC AND FINANCIAL ASPECTS OF THE BLACK POPLAR CULTIVATION IN THE MIDDLE ASIA MINOR

Year/Number: 1969/4                             ODC : 762.0:652.55:176.1 Populus
Author(s): SERTMEHMETOGLU, Z., ACAR, O., BIRLER, A.S.

In this study marketing, yields and financial aspects of black poplar cultivation were investigated. Several black poplar plantations at various spacing growing in Middle Anatolia region were sampled and inquiries were made by poplar wood marketers and growers.


4) COMPARATIVE STUDY OF GROWTH OF THE CLONES IN THE MARMARA ORIENTATION POPULETUM

Year/Number: 1978/13                             ODC : 562.1:176.1 Populus
Author(s): BIRLER, A.S., UMAC, A., DOGRU, M., USTA, H.Z.

Marmara orientation populetum was established with 42 poplar clones in 1959. Growth performances of the clones were investigated on a comparative basis. As regards the growth and yield performances, six of the best growing poplar clones are given in priority order:


5) UNIT TIMES REQUIRED FOR CONDUCTING VARIOUS REFORESTATION OPERATIONS

Year/Number: 1980/15                             ODC : 651.72:232.2:232.4:236
Author(s): BIRLER, A.S., DOGRU, M., USTA, H.Z.

This study gives the estimation of unit times required for conducting various reforestation operations carried out by man and/or by machine power under different site conditions. All types of reforestation operations carried out by 57 of the Reforestation Districts were sampled on the daily basis. The data obtained from sampling of operations. Then, a series of stepwise multiple regression analysis were made in which the data for operation unit time was used as dependent variable and those for the corresponding site conditions were used for independent variables. Eventually, a regression equation was estimated for each of the operations which are then used in producing the unit times required for conducting the operation under different site conditions.


6) THE SPACING EFFECT ON EARLY GROWTH IN EUCALYPTUS (E. camaldulensis Dehn.) PLANTATIONS

Year/Number: 1982/18                             ODC : 181.65:226.7:232.43:565 Eucalyptus
Author(s): BIRLER, A.S., DOGRU, M., AKYILMAZ, M., USTA, H.Z., AVCIOGLU, E.

This study has investigated the spacing affect on the early growth in eucalyptus plantations. Two main factors, spacing and site conditions, were represented in the trial and accordingly, experimental plantations were established in factorial block design with replications in each block. Four site conditions and seven different spacings were examined. The results showed that wood volume and dry-matter yield per acre increased by closer spacings whereas growth of single trees has decreased. On fertile bottom lands, narrower spacings of about 2.5m x 3m are recommendable for increasing the plantation yield.


7) A STUDY OF YIELD FROM "I-214" POPLAR PLANTATIONS

Year/Number: 1983/19                             ODC : 523:524.315:525.5:541:547:561:566:613:176.1
Author(s): BIRLER, A.S.

In this study, the developmental trends of Populus x euramericana (Dode) Guinier cv. "I-214" plantations growing on in the coastal and immediate hinterland regions of Turkey were investigated. Experimental plantations were established with "I-214" hybrid poplar clone in different spacings in the regions mentioned above. Volume tables, site index table and yield tables were constructed using the data obtained from experimental plantations and also from privately owned plantations. The volume tables give the estimates of stem volume, tree volume and the volume of different wood assortments according to tree height and dbh. The yield tables given in this study, involve four site classes and seven planting spacing to cover ages from 3 to 15 years. The yield tables present not only the estimates for stand volume and volume elements, but also the volume estimates for different wood assortments. Therefore, the yield tables given in this study can be named as "Wood Assortments Variable Density Yield Tables for I-214 Poplar Plantations".


8) VOLUME TABLE FOR ASIATIC PYRAMIDAL BLACK POPLARS

Year/Number: 1983/19                             ODC : 524.315:176.1 Populus
Author(s): BIRLER, A.S., USTA, Z., YUKSEL, Y.

More than one million cubic meters of black poplar wood is produced annually in Turkey. Therefore, a volume table has been required for volume estimations in black poplar plantations that produce a considerable part of the total wood production in Turkey. Totally 499 black poplar trees of various sizes were sampled in all regions of Turkey where asiatic pyramidal black poplars have been traditionally cultivated. A volume function was derived by stepwise procedure of regression analysis in which diameter at breast height and total height of the sample tree were dependent variables. A regression equation was chosen as the best fit according to its statistical parameters. This volume equation was then solved for the heights between 8 m x 32 m and for the diameters between 10 cm to 50 cm and consequently a volume table was constructed for black poplars.


9) A STUDY of YIELDS FROM PLANTATION GROWN MARITIME PINE (Pinus pinaster Ait.) STANDS

Year/Number: 1983/19                             ODC : 523.3:524.315:541:547:566:613:174.7 Populus.
Author(s): BIRLER, A.S., YUKSEL, Y.

This study was carried out for constructing volume table, site index tables and yield tables and for predicting periods of rotation in plantation grown P. pinaster stands. Fifteen sample plots were allocated in pinus pinaster stands on sites of good (I), medium (II) and poor (III) conditions at Alemdag forest. Totally 98 trees were felled in these sample planting. Approximately 1500 data concerning the tree volume and other dimensional characteristics for different age classes have been estimated by stem analysis of the sample trees. Using these data, a standard volume table, a site index table and empirical yield tables have been constructed for pinus pinaster. The period of rotation which secure maximum mean annual volume increment are occurred by the end of 30 years 40 years and 50 years in good (I), medium (II) and poor (III) sites, respectively. By the end of these rotation periods, the mean annual volume increments that can be attained are 13.8 m3/ha/year, 9.3 m3/ha/year and 5.4 m3/ha/year for the stands growing on sites of good, medium and poor conditions respectively.


10) THE EFFECT OF EUCALYPTUS LINE PLANTATIONS ON THE PRODUCTION OF NEIGHBOURING AGRICULTURAL CROPS OF COTTON, WHEAT AND CORN

Year/Number: 1985/20                             ODC : 265:176.1 Eucalyptus
Author(s): AVCIOGLU, E., USTA, H.Z.

The effects of row Eucalyptus plantations on agricultural crop (Wheat, Corn) productivity were observed. Field crop development was affected by the shade effect and root competition of row plantations. With these effects growth rate of the field crop is reduced. Direction, crop, proximity to row factors play an important role on productivity. The crop on the north slope is mostly affected. As far as species are concerned cotton is affected more than wheat and corn. First two years row plantations have no effects on agricultural crop. When the height of trees are the highest shade of the trees are effective within 25 m on both sides. Beyond maximum shade belt no detrimental effects were recorded on field crop. Although the comparisons of annual income of plantations and agricultural crop weren't done. Estimations showed that crop losses could be compensated by income from harvested wood.

ABSTRACTS