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Site productivity evaluation of some yemane (Gmelina arborea Roxb.) plantations in the Philippines / by Roger Z. Guzman.

By:

Guzman, Roger Z [author]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna, 1988. Cavite State University- Main Campus,Description: 223 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

635.9 G99 1988

Abstract: GUZMAN, ROGER Z., University of the Philippines at Los Banos, May, 1988. Site Productivity Evaluation of Some Yemane Gibelina Arborea Roxb.) Plantations in the Philippines Professor Dr. Roberto V. Dalmacio Growth performance of yemane plantations grown in Cebu Nueva Vizcaya was evaluated based on measurable physiographic, and soil factors. Physiographic factors included aspect, elevation, plot position and slope or gradient; climatic factors were annual rainfall, relative humidity, temperature and number rainy days; and soil chemical and physical properties were nitrogen, phosphorus, potassium, calcium, magnesium, sodium, 7rganic matter, pH, base saturation, cation exchange capacity, water holding capacity, soil depth and soil texture. The climatic factors obtained significant correlations with some tree growth parameters such as diameter at breast height, merchantable height, basal area, volume and site index indicating that growth of yemane plantations was significantly affected by these factors. However, only rainfall had positive correlations. Temperature and relative humidity were inversely related to tree growth. Comparatively, inverse relationships between tree growth parameters and all physiographic variables were obtained which imply that steeper slopes, from lower to upper slopes and ridgetops and from lower to upper elevations may result to a concomitant decrease in growth or site quality of yemane plantations. Analysis of soil chemical and physical properties showed that calcium content of soil, base saturation, soil depth, magnesium, cation exchange capacity, sodium and clay content of soil were all significant explanatory variables for estimating or predicting growth and site index of yemane plantations. Nitrogen, phosphorus, potassium, organic matter and percent clay content of soil are all positively correlated with tree growth indicators while calcium, magnesium, cation exchange capacity, base saturation, pH, percent silt and percent sand had negative correlations. Eight growth prediction equations were developed from among the significant components of site factors, as follows: 1. SI = 16.8705 + 0.1238 ACAW 2. SI = 25.8568 + 0.2485 ACAW o 0.0604 ABS 3. SI = 36.1911 + 0.1572 ACA - 0.0905 ABS 4. SI = 33.4209 + 0.1448 ACA - 0.0926 ABS + 0.0927 TSD 5. SI = 36.3285 + 0.1150 ACA + 1.3511 AMGD+0.1040 ABS + 0.0319 TSD 6. SI = 39.1642 + 0.1431 ACA + 0.4876 AMGD+0.1206 ACECD - 0.0962 ABS + 0.0317 TSD 7. SI = 50.0101 0.1633 ACA - 0.1294 ACECD 0.0926 ABS + 0.0358 TSD - 0.1800 PCL 8. Sl = 53.8170 0.1692 ACA - 1.9482 ANA ± 0.1234 ACED-0.0961 ABS +0.0331 TSD + 0.1659 PL Where: SI = Site index at base age 15 years ACA = Average calcium content of soil, dry and wet seasons ACAW = Average calcium content of soil, wet season. ABS = Average base saturation, dry and wet seasons TSD = Effective soil depth AMGD = Average magnesium content of soil, dry season ACECD = Average cation exchange capacity, dry season PCL = Percent clay content of soil ANA = Average sodium content of soil, dry and wet seasons

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	635.9 G99 1988 (Browse shelf(Opens below))		Room use only	T-1536		00006232

Thesis (Ph.D.--Forestry : Silviculture and Forest Influences) University of the Philippines

Includes bibliographical references.

GUZMAN, ROGER Z., University of the Philippines at Los Banos, May, 1988. Site Productivity Evaluation of Some Yemane Gibelina Arborea Roxb.) Plantations in the Philippines
Professor Dr. Roberto V. Dalmacio
Growth performance of yemane plantations grown in Cebu Nueva Vizcaya was evaluated based on measurable physiographic, and soil factors. Physiographic factors included aspect, elevation, plot position and slope or gradient; climatic factors were annual rainfall, relative humidity, temperature and number rainy days; and soil chemical and physical properties were nitrogen, phosphorus, potassium, calcium, magnesium, sodium, 7rganic matter, pH, base saturation, cation exchange capacity, water holding capacity, soil depth and soil texture.
The climatic factors obtained significant correlations with some tree growth parameters such as diameter at breast height, merchantable height, basal area, volume and site index indicating that growth of yemane plantations was significantly affected by these factors. However, only rainfall had positive correlations. Temperature and relative humidity were inversely related to tree growth. Comparatively, inverse relationships between tree growth parameters and all physiographic variables were obtained which imply that steeper slopes, from lower to upper slopes and ridgetops and from lower to upper elevations may result to a concomitant decrease in growth or site quality of yemane plantations. Analysis of soil chemical and physical properties showed that calcium content of soil, base saturation, soil depth, magnesium, cation exchange capacity, sodium and clay content of soil were all significant explanatory variables for estimating or predicting growth and site index of yemane plantations. Nitrogen, phosphorus, potassium, organic matter and percent clay content of soil are all positively correlated with tree growth indicators while calcium, magnesium, cation exchange capacity, base saturation, pH, percent silt and percent sand had negative correlations. Eight growth prediction equations were developed from among the significant components of site factors, as follows:
1. SI = 16.8705 + 0.1238 ACAW
2. SI = 25.8568 + 0.2485 ACAW o 0.0604 ABS
3. SI = 36.1911 + 0.1572 ACA - 0.0905 ABS
4. SI = 33.4209 + 0.1448 ACA - 0.0926 ABS + 0.0927 TSD
5. SI = 36.3285 + 0.1150 ACA + 1.3511 AMGD+0.1040 ABS + 0.0319 TSD
6. SI = 39.1642 + 0.1431 ACA + 0.4876 AMGD+0.1206 ACECD - 0.0962 ABS + 0.0317 TSD
7. SI = 50.0101 0.1633 ACA - 0.1294 ACECD 0.0926 ABS + 0.0358 TSD - 0.1800 PCL
8. Sl = 53.8170 0.1692 ACA - 1.9482 ANA ± 0.1234 ACED-0.0961 ABS +0.0331 TSD + 0.1659 PL
Where:
SI = Site index at base age 15 years
ACA = Average calcium content of soil, dry and wet seasons
ACAW = Average calcium content of soil, wet season.
ABS = Average base saturation, dry and wet seasons
TSD = Effective soil depth
AMGD = Average magnesium content of soil, dry season
ACECD = Average cation exchange capacity, dry season
PCL = Percent clay content of soil
ANA = Average sodium content of soil, dry and wet seasons

Submitted to the University Library 05/10/2007 T-1536