• Title, Summary, Keyword: stand volume

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Studies on the Estimation of Stand Volume Increment in the Jack Pine (Pinus banksiana Lamb.) in Artificial Forest (방크스소나무 인공림(人工林) 임분(林分)의 재적생장(材積生長) 추정(推定)에 관(關)한 연구(硏究))

  • Lee, Jong-Lak
    • Journal of Korean Society of Forest Science
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    • v.89 no.3
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    • pp.414-421
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    • 2000
  • This study was carried out for the artificial forest stand of 23 years old jack pine(Pinus banksiana Lamb.) in Soheul-myun, Pochun-kun, Kyunggi province of Korea. The objectives of this study were to investigate the stand volume increment and the rate of stand volume, and were to investigate present stand volume to determine annual cutting volume for keeping stand volume to an ideal level for investigated jack pine stand. For a reasonable calculation of stand volume increment, diameter of breast height(DBH), tree height, bark width, and core length for the last 10 years for respective sampling plots were measured. By using these measurements annual diameter increment in DBH class, stand volume increment of 95% confidence interval and tree height curve equation were calculated. The tree height value was derived from the tree height curve equation. Calculation of tree volume by using the tree volume table was made by conferring the tree height value. The summarized results for investigated jack pine trees were having 7.7% annual stand volume increment with 6.1% estimated error. The total stand volume per ha was $79.58m^3$, accordingly the annual stand volume increment was $6.13m^3$ per ha, and the 95% confidence intervals range from 5.77 to $6.51m^3$.

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Hierarchical Bayesian analysis for a forest stand volume (산림재적 추정을 위한 계층적 베이지안 분석)

  • Song, Se Ri;Park, Joowon;Kim, Yongku
    • Journal of the Korean Data and Information Science Society
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    • v.28 no.1
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    • pp.29-37
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    • 2017
  • It has gradually become important to estimate a forest stand volume utilizing LiDAR data. Recently, various statistical models including a linear regression model has been introduced to estimate a forest stand volume using LiDAR data. One of limitations of the current approaches is in that the accuracy of observed forest stand volume data, which is used as a response variable, is questionable unstable. To overcome this limitation, we consider a spatial structure for a forest stand volume. In this research, we propose a hierarchical model for applying a spatial structure to a forest stand volume. The proposed model is applied to the LiDAR data and the forest stand volume for Bonghwa, Gyeongsangbuk-do.

Development of a Stand Density Management Diagram for Teak Forests in Southern India

  • Tewari, Vindhya Prasad;Alvarez-Gonz, Juan Gabriel
    • Journal of Forest and Environmental Science
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    • v.30 no.3
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    • pp.259-266
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    • 2014
  • Stand Density Diagrams (SDD) are average stand-level models which graphically illustrate the relationship between yield, density and mortality throughout the various stages of forest development. These are useful tools for designing, displaying and evaluating alternative density regimes in even-aged forest ecosystems to achieve a desired future condition. This contribution presents an example of a SDD that has been constructed for teak forests of Karnataka in southern India. The relationship between stand density, dominant height, quadratic mean diameter, relative spacing and stand volume is represented in one graph. The relative spacing index was used to characterize the population density. Two equations were fitted simultaneously to the data collected from 27 sample plots measured annually for three years: one relates quadratic mean diameter with stand density and dominant height while the other relates total stand volume with quadratic mean diameter, stand density and dominant height.

Shape Prediction in Eulerian Analysis of Three-Roll-Stand Shape Rolling (Three-Ro II-Stand 형상압연의 오일러리안 해석에서 형상예측)

  • 이용신;나경환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.328-331
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    • 2001
  • Shape changes of a workpiece in an Eulerian Finite Element analysis for the steady state. three-roll-stand shape rolling are modelled. Although an Eulerian analysis has many advantages for the steady state rolling problems, it necessitates an assumption about the unknown shape of the control volume. In almost all cases. the assumed control volume does not match the final shape and the control volume should be updated. This update can be accomplished by performing a free surface correction. The final shape of a material point, which has a spherical shape at the inlet, can be also predicted by integrating a deformation gradient along a stream line. Analyses of three-roll-stand shape rolling is in detail examined.

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Relationship between Growth Factors and Spectral Characteristics of Satellite Imagery in Korea

  • Park, Ji-Hoon;Ma, Jung-Lim;Nor, Dae-Kyun;Kim, Chan-Hoi;Hwang, Hyo-Tae;Jung, Jin-Hyun;Kim, Sung-Ho;Jo, Hyeon-Kook;Lee, Woo-Kyun;Chung, Dong-Jun
    • Journal of Forest and Environmental Science
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    • v.24 no.3
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    • pp.165-169
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    • 2008
  • This study attempts to analyze the relationship between forest volume and age based on 5th NFI data and spectral characteristics of satellite imagery using ASTER sensor in Korea. Forest stand volume and age had the negative correlation with the spectral reflectance in all of the band (Blue, Green, Red, SWIR). With increasing of stand volume and age, spectral reflectance decrease. The spectral reflectance of band1 showed the highest correlation between stand volume and spectral reflectance among the VNIR wavelength. The spectral reflectance band 1, 2 (visible wavelength) and stand age have high correlation compared to other bands. The correlation coefficients between forest volume and vegetation indices have low relationship. This result indicates that the reflectance of blue band may be important factor to improve the potential of optical remote sensing data to estimate forest volume and age.

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Regeneration and Tending Practices for Natural Mixed Stands of Quercus mongolica-Abies holophylla II. Prediction of Futures Stand Structure using Rate of Increment (신갈나무-전나무 천연(天然) 혼효임분(混淆林分)의 갱신(更新) 및 무육방법(撫育方法) II. 생장률(生長率)을 이용(利用)한 미래(未來) 임분구조(林分構造)의 예측(豫測))

  • Shin, Man Yong;Lim, Joo Hoon;Chun, Young Woo;Ko, Yung Zu
    • Journal of Korean Society of Forest Science
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    • v.81 no.2
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    • pp.146-155
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    • 1992
  • The natural mixed stand in Jindong-Ri, according to a recent study, showed the possibility of selection cutting as a silvicultural system based on the stand structure such as DBH distribution and height distribution. However, volume structure per DBH class of this stand had not a mature stand of selection cutting. In this study, wherefore, the rate of increment for DBH and volume was used to predict the future stand structure including volume distribution per DBH class. The possibility of selection cutting was then discussed using the future stand structure. From the prediction of future stand structure for 30 years per every 10 years, it could be concluded that the stand will be induced to selection cutting forest because of enough number of trees in objective DBH class and above, total volume per hectare, and the volume of large DBH class which can be harvested every year. However, this stand still did not show the structure of typical selection cutting which has the rate of 1 : 2 : 7 in the number of trees per hectare and the volume rate of 5 : 3 : 2 for large, medium, and small DBH class. This problem could be improved by appropriate silvicultural treatments.

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A Study on the Stand Volume Estimation by Strand Method (Strand법(法)에 의한 임분재적추정(林分材積推定)에 관(關)한 연구(硏究))

  • Lee, Heung Kyun
    • Journal of Korean Society of Forest Science
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    • v.80 no.2
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    • pp.187-192
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    • 1991
  • This study was carried out to estimate the stand volume for Japanese larch(Larix leptolepis) by Strand sampling method. The data collected for this study were based on the 380 sample plots from the field survey, which were distributed in the major part of Korea(Kyeongi, Kangweon, Chungbuk, Chungnam, Chunbuk and Kyeongbuki), and the plotless sampling instrument such as dendrometer, spiegel relascope and tele-relascope were used. The procedure for this study is summarized briefly as follows : 1. There were not only significant differences between volume estimation by Strand sampling method and that by plot survey method, and the relationship was y=bx, where b approached nearly 1. Therefore, the stand volume of Japanese larch could by estimated by Strand sampling method. 2. The value measured by three different plotless sampling instruments did not showed any significant differences between instruments and observers, density and instruments, and ground slope and instruments. 3. With the stand volume, basal area height showed the highest correlation and stand form height, average height, basal area per ha correlated with the volume in thier orders. 4. The best fitted equation of stand volume estimation with basal area height by relascope was as follow. log V=-0.0375+0.8910 log GH-1.5946 1/GH Stand volume table also was obtained using the above estimeated equation. 5. The relationship between estimated value and actual value was Y=bx, where b was nearly 1. The correlation coefficient was very high and the percentage of estimated error was 4.5%.

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A Study on the Estimation of Stand Volume by Stand Form Height (임분형상고(林分形狀高)에 의한 임분재적(林分材積) 추정(推定)에 관한 연구(硏究))

  • Kim, Suk Kwon;Lee, Heung Kyun;Lee, Yeo Ha
    • Journal of Korean Society of Forest Science
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    • v.61 no.1
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    • pp.15-19
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    • 1983
  • To establish the stand volume table of Pinus koraiensis S. et Z. and Larix leptolepsis Gord. mean diameter at breast height (D), mean height, basal area per ha, stand from height (H.F), basal area height, number of trees per ha, volume per ha, stand age and site were investigated for 107 plots of P. koraiensis and 82 plots of L. leptolepsis throughout the country. The obtained results are as follows; 1) the relationships between stand volume (V) and H.F. were log V=1.3855+0.1168 H.F and log V+0.9929+0.1543 H.F in P. koraiensis and L. leptolepsis, respectively. 2) The relationship between D and H.F was estimated as H.F = 1.2569+0.2576D for P. koraiensis and as H.F = 4.3045+0.1443D for L. leptolepsis 3) Estimated errors calculated with the application of these stand volume tables were 18.29% and 19.22%r for P. koraiensis and L. leptolepsis respectively.

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Study on the Estimate of Stand Volume in the Pitch Pine Forest (임분재적(林分材積) 추정(推定)에 관(關)한 연구(硏究))

  • Lee, Yeo Ha
    • Journal of Korean Society of Forest Science
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    • v.18 no.1
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    • pp.1-7
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    • 1973
  • This survey was estimated under the ratio estimate such as single class method, simple random sampling method, compound ratio sampling method, separate ratio sampling method and average tree sampling method artificial forest pitch pine volume. The following results were realized by the ratio estimates. At the above table simple random sampling method and compound ratio sampling method are the only ones which is included the actual stand volume in the ratio estimatedstand volume. It is thought that the sampling was in a such good result was because of stand structual stands were simple forest. The most simple measurement and calcuation on the stand volume estimates, in order, would be (1) single class method, (2) simple random sampling method (3) average tree method (4) separate ratio sampling method and compound ratio sampling method, and at the planted evenaged forest the method has realized the best results in obtaining good accuracy and the measure stand volume with least time, expenses and labor in considerably.

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Influencing Degree to the Air Temperature of Stratification in the Urban Green Space (도시녹지의 계층구조가 기온에 미치는 영향)

  • 윤용한;김원태
    • Asian Journal of Turfgrass Science
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    • v.16 no.2
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    • pp.107-114
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    • 2002
  • In this study, We measured air temperature in a vegetated area to investigate if stand types and height affect air temperature. With the measured data, we analyzed the relation-ships between air temperature vs. ground cover type, vegetated area, stand structure, stand density, and tree volume by regression analysis. The results show that the paved area and open field have higher air temperatures than the vegetated area and water-related areas. Among the stand types, the stand with overstory and sub-overstory showed relatively low are temperature. The stand with overstory had lower air temperature than the stand with sub-overstory. Increasing stand density was effective for lowering air temperature.