The Relationship between Site Characteristics and <i>Pinus radiata</i> Growth on the Tsitsikamma Plateau, South Africa

Louw, J. D.

doi:10.1080/00382167.1991.9630373

Cited by 8 publications

(9 citation statements)

References 8 publications

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“…The positive correlations between the levels of foliar P and the available P in the soil and the ECEC suggest that an extra input of this element would improve the development of radiata pine, although other factors such as pH, availability of P at depth, mycorrhizal activity and high levels of N may also affect absorption of this element by plants. Despite this, foliar levels of P can by satisfactorily predicted from the concentration of available P in the soil, as has been pointed out in previous studies (Hunter and Gibson, 1984;Louw, 1991), even when the lowest foliar concentrations coincide with low levels of available P in strongly acidic soils. The pH of the soils in the study area was around 4 influencing in the ECEC, whereas Hunter and Gibson (1984) reported an optimum soil pH of 6 for radiata pine.…”

Section: Resultsmentioning

confidence: 71%

“…On the other hand, many of the plantations in the study (75%) are growing in soils less than 40 cm deep located on steep slopes. Jackson and Gifford (1974) found the highest productivity of radiata pine in soils of depths between 60 and 80 cm and were attributed to the volume of soil available for root exploration and the availability of water and nutrients (Turvey et al, 1986;Louw, 1991).…”

Section: Resultsmentioning

confidence: 99%

“…Surface soil acidity can serve as an indicator of soil fertility and may indicate indirectly the quantity of available P. Effective soil depth is another variable used to evaluate site quality, and is related to the exploitable soil volume for the roots and, consequently to the available water and nutrition (Pyatt et al, 2001). Louw (1991) observed that in radiata pine stands in South Africa, the foliar nutrient concentration and the volume of soil available for roots were highly correlated, as was site index. Other studies in young plantations have revealed nutrient deficiencies (especially K), which were attributed to fixation of elements by clay minerals, and low foliar levels of P, Ca and/or Mg as important factors limiting growth (Merino and Edeso, 1999).…”

Section: Introductionmentioning

confidence: 94%

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Relationship among soil parameters, tree nutrition and site index of Pinus radiata D. Don in Asturias, NW Spain

Afif-Khouri¹,

Obregón²,

Prendes³

et al. 2010

For. syst.

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The relationships among soil parameters, tree nutrition and site index were examined in Pinus radiata D. Don stands in a climatically homogeneous area of NW Spain. Thirty-eight even-aged stands, ranging from 10 to 54 years, were sampled. In each stand, a representative plot of 0.1 ha was selected and different stand variables and parent material were considered. The soils in the study area are strongly acidic, with high proportions of organic matter, high C/N ratios, and low exchangeable base cation and available P concentration extracted by Mehlich 3 method (PM3). Although foliar N was sufficient in every stand studied, widespread deficiencies of K, P and, to a lesser extent, Mg and Ca were diagnosed. The foliar concentrations of P were positively correlated with PM3 and effective cation exchange capacity. The SI values ranged between 9.5 and 28.8 m and were positively correlated with foliar P and extractable K in soil. In the stands developed on quartzite and sandstone lithologies, the SI was negatively correlated with slope and foliar N respectively. The results suggest the importance of site selection and fertilizer treatment in reforestation programmes.Key words: age-height relationship, needle analysis, Pinus insignis, soil analysis. Resumen Influencia de los factores edáficos en el índice de sitio y estado nutricional de Pinus radiata D. Don en Asturias, noroeste de EspañaSe estudia en 38 parcelas de 0,1 ha cada una las propiedades del suelo que más influyen en el índice de sitio (IS) de plantaciones de Pinus radiata D. Don de 10 a 54 años de edad y en su estado nutricional en Asturias, considerando diferentes variables de masa y distinto material parental. Los suelos estudiados presentaron un carácter fuertemente ácido, alto contenido de materia orgánica, relación C/N elevada, bajo contenido en bases y P disponible extraído por el método de Mehlich 3 (PM3). Las deficiencias más extendidas fueron en K y P, observándose en algunas parcelas deficiencias en Mg y Ca. Sin embargo, las concentraciones en N fueron siempre superiores al nivel crítico. El P foliar se correlacionó positivamente con la capacidad de intercambio catiónico efectiva y con PM3. El IS osciló entre 9,5 y 28,8 m y estuvo positivamente correlacionado con la concentración de P en acículas y con el K intercambiable en el suelo en todas las parcelas y negativamente con la pendiente y el N foliar en las parcelas desarrolladas sobre cuarcitas y areniscas respectivamente. Los resultados revelan la importancia de la elección del sitio y la necesidad de fertilización en los programas de reforestación.Palabras clave: análisis de acículas, análisis de suelo, pino insigne, relación altura-edad.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

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Relationship among soil parameters, tree nutrition and site index of Pinus radiata D. Don in Asturias, NW Spain

Afif-Khouri¹,

Obregón²,

Prendes³

et al. 2010

For. syst.

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“…Curt et al (2001) reported that more than 35% of the observed variance of the Douglas fir site index was explained by former land use. Soil physiological and chemical characteristics have been related to site productivity, and are reported to be critical factors that determine the site productivity in many studies (e.g., Hunter and Gibson 1984;Klinka and Carter 1990;Louw 1991;Wang 1995;Wang and Klinka 1996;Herrera et al 1999). Other studies have successfully modified the performances of site index models by simultaneously using both topographic factors and soil properties (e.g., Takeshita 1964;Trimble 1964;Yamane et al 1990;Corona et al 1998).…”

Section: Discussionmentioning

confidence: 98%

“…Although some drawbacks have been pointed out (e.g., Daubenmire 1976;Richardson et al 1999), site index, defined as the height of dominant trees (i.e., site trees) at a specific reference age, is the most commonly used measure of site productivity for specific species both in Japan and elsewhere (e.g., Takeshita et al 1960;Hägglund 1981;Davis and Jhonson 1987;Wang 1998). Site indices have been modeled for many species in regions such as North America (e.g., Trimble and Weitzman 1956;Trimble 1964;Green et al 1989;Hostin and Titus 1996) and Europe (e.g., Fries et al 1998;Corona et al 1998;Curt 1999;Curt et al 2001), as well as in numerous countries (e.g., Hunter and Gibson 1984;Louw 1991;Herrera et al 1999) including Japan (e.g., Takeshita 1964;Nishizawa et al 1965;Fukushima et al 1974;Yamane et al 1990). Recently, with the development and popularization of the geographic information system (GIS), many site quality models based on digital terrain analysis using a digital elevation model (DEM) have been proposed (e.g., Iverson et al 1997;Chen and Abe 1999;Mitsuda et al 2001;Sturtevant and Seagle 2004;Minowa et al 2005).…”

Section: Introductionmentioning

confidence: 98%

Predicting the site index of sugi plantations from GIS-derived environmental factors in Miyazaki Prefecture

Mitsuda

Ito

Sakamoto

2007

Journal of Forest Research

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We constructed sugi site index models using digital-terrain-analysis-based environmental factors for Miyazaki Prefecture. We selected 18 sugi plantation stands which were pure, undisturbed, and over 40 years old, planted with the same sugi-cutting cultivar, and managed by normal forest operations. The dominant tree in each stand was felled for stem analysis. Site index, defined here as dominant tree height at 40 years old, was estimated by stem analysis for each stand. Five types of DEMs were used: 100-and 50-m resolution derived from DEMs published by the Geographical Survey Institute, and 50-, 25-, and 12.5-m resolution derived from digital contour map manually generated from a 1:25,000 topographic map. A total of 14 indices categorized into solar radiation index, wetness index, and topographic exposure index were used to model the site index by multiple linear regression analysis. Through model selection procedures, the bestfitted site index models were selected for each type of DEM. The most precise model was that of the 12.5-mresolution DEM (R 2 = 0.692), following the model of the published 50-m-resolution DEM (R 2 = 0.665). Site productivity of sugi was severely limited by direct solar radiation. Soil wetness also affected sugi site productivity; however, it can only be represented using a high-resolution DEM derived from fine-scale data. Our results suggest that the 50-m-resolution DEM published by the Geographical Survey Institute can be used for site index modeling.

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Identification of key soil indicators influencing plantation productivity and sustainability across a national trial series in New Zealand

Watt¹,

Davis²,

Clinton³

et al. 2008

Forest Ecology and Management

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The Relationship between Site Characteristics and Pinus radiata Growth on the Tsitsikamma Plateau, South Africa

Cited by 8 publications

References 8 publications

Relationship among soil parameters, tree nutrition and site index of Pinus radiata D. Don in Asturias, NW Spain

Relationship among soil parameters, tree nutrition and site index of Pinus radiata D. Don in Asturias, NW Spain

Predicting the site index of sugi plantations from GIS-derived environmental factors in Miyazaki Prefecture

Identification of key soil indicators influencing plantation productivity and sustainability across a national trial series in New Zealand

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