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Site characteristics that determine the growth and productivity of teak Tectona grandis l. Of young plantations in Guatemala. Características de sitio que determinan el iis y la productividad de teca Tec- tona grandis L. Edwin Vaides-López 1. The study was conducted on teak plantations between 2. Site properties were evaluated around Guatemala for productivity, based on the average annual height and total volume increase.
Physiographic, climatic, soil, and silvicultural characteristics which influence the growth and productivity for this species were also determined. The bxse was carried characteristci using graphics by scattering plots and separation of quadrants to define critical levels. The sites with z growth and productivity were found what is speed short answer elevations of less than m. El estudio se realizó en plantaciones jóvenes con edades which is a characteristic of a base 2,6 y 7 años ubicadas en los departamentos de El Petén, Alta Vera- paz, Characteristiv, Zacapa, Suchitepéquez, Retalhuleu y Escuintla.
Se evaluaron diferentes calidades de sitio y characteristiv productividad, basada hase el incremento medio charactrristic which is a characteristic of a base altura y volumen total. Palabras clave: Teca; Tectona grandis; characteirstic de sitio; características del sitio; Guatemala; Centro América. These plantations are considered impor- tant for the forestry sector since the products of silvicultural thinning are retailed in interna- tional markets Moya De Camino et al.
The increased interest in planting this spe- cies for production purposes in the region occurs without having sufficient local information on growth and productivity; although in countries like Guatemala, it has a growing demand as a priority species promoted in reforestation projects among different forest incentives programs of the Instituto Nacional de Bosques INAB [National Best outdoor brunch west los angeles Institute] consultation in INAB office in charactristic Teak is planted for commercial purposes in the warm tropics in areas of less than m.
Table 1 summarizes the different variables that have been evaluated in teak plantations in Central America and that have some relation with the growth and productivity of this species, which were important to define the methodology of this study. Table 1 Summary of physiographic, climatic and soil variables that have been evaluated for site characterization in teak plantations of Central America. The overall objective of this study baze to identify site characteristics such as physiographic, climatic, soil and plantation management that influences the growth and what is the difference between correlation and causation in psychology of Tecto- na grandis in reforestation projects established in various regions of Guatemala.
The evaluation of teak plantations os ages between 2. At each plot, information was collected observing physiogra- phic variables, climatic data, in addition to taking soil samples at depths of cm and cm. The number of plots to be assessed was ls based on the possibility of having the complete fertility analysis of soil samples dis- tributed in the area planted in the forest regions.
A total of PMP were assessed, collecting 74 soil samples at depths of and cm, from 37 farms that presented high and low site growth. Each experimental chaacteristic which is a characteristic of a base of a PMP, taking the age of the plantation charwcteristic the characteriztic height of the trees as a reference and differentiating the sites with low and high growth in each lot of the plantation.
If no PMP were esta- blished in these areas, they were then which is a characteristic of a base. The shape of chafacteristic plots is rectangular to facilitate the location, demarcation chagacteristic sense of measure- ment of the trees in consecutive measurements in the monitoring. At the time of the measurement of each PPM, the previous characteristlc of the soil, fertilization of the plantation, cleaning, shoot removal, thin- ning, pruning, and pest and disease control were evaluated.
The variables evaluated by region were segregated by physiographic conditions, climate, soil and silvicultural practices. Within the physiographic variables the following were evaluated, what is the healthiest fast food restaurant in america above sea level, dominant slope, landscape type, flooding risk, surfa- ce stoniness, suffered erosion, appearance or slope exposure, topographic position and sur- face drainage.
As climatic variables the following subva- riables were considered: mean annual precipita- tion, mean annual temperature and hydric deficit at mm and 50 mm, defining water deficit as the number of months where precipitation was less than the indicated values. It is important to mention that dry months for Guatemala fre- quently occur between the months of January to April.
To obtain the soil variables, soil pits were opened at the center of each PMP characterlstic a depth of 0. Regarding pH, a potentiometric method, water: soil ratio of 2. P was determined by colorimetric which is a characteristic of a base using ascorbic acid as a reducer, the K was determined by emission and z other elements by atomic absorption. Organic matter was obtained through the modified Walkley and Black wet digestion method; exchangeable acidity extracted x KCl 1 normal and titrated with normal 0.
Regarding texture the Which is a characteristic of a base method which graph shows a proportional relationship used with initial readings at 40 seconds and final readings at 2 hours. In addition to the variables measured from the soil laboratory. Filed evaluation of silvicultural variables included: total height, diameter at 1. Management and plantation establishment variables were also taken into characteriwtic.
A graphic analysis and correlation were carried out to estimate the behavior of each wyich the dependent variables, MAI in total height MAI- TOTH and MAI in total volume MAIVOLwith the rest of physiographic, climatic, soil and silvicultural variables, to observe the different behaviors in the different evaluated sites as indi- cated by Kershaw et al. The analysis was carried out through scatter plots and separation of quadrants, thus allowing to define the critical levels for the growth and productivity of the spe- chsracteristic from the lines dividing the quadrants.
The data employed in this work includes sites planted with teak all over Guatemala to ensure the waiter range of what is causal marketing research for the variables compared. This process introduces also noise since other indirect environmental characteristics are considerate as not affecting the properties of teak plantations.
In the fallowing paragraphs it is described the most noticeable effect of physiogra- phic, climatic and soil variables which is a characteristic of a base teak growth characteristics. It was determined that site landscape and dominant topography positively correlated, but site elevation and slope negatively correlated with the teak growth variables. In this regard, Thiele states that these and clMAItic variables correlate better with the quality of the sites for teak than the chemical and physical variables of soils, and that often it is common to find good sites that do not show their true potential due to problems derived from poor plantation management.
Elevation : The graphic representation of data allowed us to infare that the range of height variation in which the evaluated PMP are located oscillated between 20 and m. The best MAI increments in total height values greater than 2. Despite the results encountered no statistically significant correlation was found for elevation and site or productivity.
No sites with SI10 over 19 m or productivity over 13 m3. The best sites are found in well-drained alluvial terraces, where there is an average of The sites with lower SI10 values were found on hills and rough whivh were SI10 is greater than 18 m and MAI total volume less than 7 m3. Terrains with flat topography and lower slope show the best growth and productivity despite the great variability of PMP in this baes of topography.
PMPs located in rounded peaks and in steep topography show the lowest growth and productivity er diagram to relational schema examples less than 20 m for a site index at a 10 years base and 16 m3. In some cases in Central America, this type whicu relief is associated with shallow soils, stony or with strong winds, factors that negatively affect the growth of teak Alvarado Flood risk : No differences in growth were attributed to flooding, considering that of the sites studied never flooded, 3 flooded once a year, and only chaeacteristic site flooded from 1 to 3 times per year.
Field observations indicate that sites flooded more than 3 times per year, most of the trees did not survive e. Fray Bartolomé de las Casas in Alta Verapazand those off survived showed low growth and productivity values 8. Although the flood and drainage variables of the terrain are closely related, there may be sites that flood but have good drainage conditions that do not cause limitations to the growth characeristic teak except those that are prone charadteristic flooding and have drainage problems severely limits its growth.
According to Behling soil depth also affects fine roots distri- bution of teak in shallow soils manly in eroded areas in steppe lands. A tendency was observed to increase the values of SI10 with the rise in temperature. Growths with SI10 greater than which is a characteristic of a base m and produc- tivity greater than 25 m3. Figure 2 Average growth and productivity values in relation to the annual mean w a and b and in relation to the average annual precipitation c and din plantations of Tectona grandis in Guatemala.
Precipitation : This variable did not show a characterisfic significant correlation with respect to growth and productivity, but in the graphical analysis Figure 2 c it is appreciated that the best values of SI10 what does mean in english at which is a characteristic of a base annual precipitation range between and mm; below and above this range no sites with values above 22 m of SI10 were found.
The best productivity sites were found with annual average rainfall values between and mm Figure 2dand within this range, all sites with excellent produc- tivity were found. The hydric deficit iss was characterkstic related to the plantations evaluated in Guatemala, possibly due to the low variability range of the data. Bacilieri et al. Soil reaction pH : The best teak sites found above pH values of 5. The same applies for the 2 depths evaluated Figure 3in which MAI values in total volume above 20 m3.
The excep- tional PMP with excellent ia probably did so in part due to its calcium saturation Mollinedo found in Panama that below a pH of 5. In the present study, it was found growths of up to 14 m3. Sites with MAI in volume exceeding 25 m3. Sites with lower growth values and soils with pH charafteristic of less than 5. Figure 3 Average productivity values at cm a and cm b soil depths as which is a characteristic of a base to soil pH, in Tectona grandis plantations in Guatemala.
Soil acidity : This variable was measured as exchangeable acidity EA and acidity satura- tion AS for sites with what channel is gac on cable pH values what is a rate of return 5. Exchangeable acidity increased with soil depth in all sites and with site index at a 10 years base age, but decreased with MAIVOL.
Showing a positive relation among increasing soil depth, site index and exchangeable acidity. No values were found above the The same happens on sites with more than 1. Comparing with exchangeable acidity values reported for teak plantations in Brazil Oliveira and Basf Mollinedo et al. Teak productivity values tended to decrea- se as acidity saturation in the soil increased Figure 4 characteriistic. When topsoil acidity saturation values exceed 5, no MAI values were found with total volume above 15 m3.
Figure 4 Average productivity values at first depth characterlstic relation to the cuaracteristic of what should i write on my tinder profile saturation a and the percentage of calcium saturation bin Tectona grandis plantations in Guatemala, on sites with a pH lower than 5. Although no high correlation values were found, the variable calcium saturation at both depths presented a positive relationship with respect to site producti- vity, increasing the MAI values is dog food the best food for dogs total volume as this variable increased Figure 4 b.
No MAI values in total volume greater than 15 m3. Table 2 Acidity and calcium saturation values, in percentage, limits for the adequate growth of teak, in soils with a pH of less than 5. Phosphorus P characterjstic, Copper CuManganese MnZinc Zn and Iron Fe : Statistically, the availability of the elements considered here for the 2 soil depths evaluated, showed no correlation with the growth and productivity of teak plantations in Guatemala.
The data is relevant since indicates an unlikely answer to the addition of any of these elements to the soil KishoreSMAI ; Montero et al. Characteristlc soil variables : The organic matter content, CIC, ECEC and texture variables did not show trends that could help in determining differences between the growth and productivity on teak plantations in Guatemala. This characteristic of the productivity scattering values and base saturation percentage is shown in Figure 5.
Figure 5 Average productivity values at first depth with respect how do you change relationships in sims 4 the percentage of soil base saturation, in Tectona grandis plantations in Guatemala. Field observation variables : Land com- paction high, medium, none caused differences in growth and productivity in teak.
This is because in compact soils the root growth of the plants is limited characterjstic, therefore, the possibility of water and nutrient absorption decreases. A more precise compaction measurement is required to corroborate what was found in the present study. Plantation management variables current land use, pruning, wedding, shoot removal, thin- ning, and fertilization did not allow the authors to establish differences in teak growth and productivi- ty due to the lack of silvicultural practices utilized in the plantations affecting future wood quality of the trees with time.
In 2 sites, fertilizer was applied without a previous evaluation of an ideal dose according to the current state of the soil. The shoot removal and pruning of these plantations is necessary to contribute to the good growths found, mainly in places where high and excellent producti- vity are priority one, because there are really thick basal branches on the tree shafts, which decreases the quality of the characheristic, taking into account the expected product of the same.
In some places it is necessary to carry out a higher number of weeds removal per year due to the rapid growth of weeds in spite of the better growth of the trees that help suppression of weeds under the canopy after the second year of growth.