scholarly journals Geostatistical analysis of soil properties in a secondary tropical dry forest, St. Lucia, West Indies

1994 ◽  
Vol 163 (1) ◽  
pp. 45-54 ◽  
Author(s):  
Otto J. Gonzalez ◽  
Donald R. Zak
Forests ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 428 ◽  
Author(s):  
Valentina Carrasco-Carballido ◽  
Cristina Martínez-Garza ◽  
Héctor Jiménez-Hernández ◽  
Flavio Márquez-Torres ◽  
Julio Campo

Deforestation of tropical dry forest reduces soil fertility, with negative effects on future restoration intervention. To evaluate the effect of initial soil properties on three-year performance of six tree species in restoration settings, we measured C, N, and P contents in topsoils of 48 plots under minimal (exclusions of livestock grazing) and maximal (plantings of six native species) restoration intervention during two years in tropical dry forest in central Mexico. Survival and height and diameter relative growth rates were evaluated by species and by growth rank (three fast- and three slow-growing species). After two years, organic C and the C:N ratio increased early during natural succession; these increases might be related to high density of N2-fixing recruits at both intervention levels. Changes in N availability for plants (i.e., NO3− and NH4+ contents) occurred after cattle exclusion. After 40 months, the fast-growing legume Leucaena esculenta (DC.) Benth. had the highest survival (65.55%) and relative growth rate in both height (3.16%) and diameter (5.67%). Fast-growing species had higher survival and diameter growth rates than slow-growing species. Higher diameter growth rates for fast-growing species may be associated with a higher ability to forage for soil resources, whereas similar height growth rates for slow and fast-growing species suggested low competition for light due to slow natural succession at the site. Planted seedlings had higher survival possibly due to initial high NO3− content in the soil. Also, fast-growing species seem to benefit from initially higher pH in the soil. Both soil properties (i.e., pH and NO3−) may be augmented to favor the performance of fast-growing species in restoration plantings and to further accelerate soil recovery in tropical dry forests.


2017 ◽  
Vol 29 (2) ◽  
pp. 315-325 ◽  
Author(s):  
Bárbara Ayala-Orozco ◽  
Mayra E. Gavito ◽  
Francisco Mora ◽  
Ilyas Siddique ◽  
Patricia Balvanera ◽  
...  

2016 ◽  
Vol 32 (2) ◽  
pp. 116-124 ◽  
Author(s):  
Bo Sann ◽  
Mamoru Kanzaki ◽  
Seiichi Ohta

Abstract:We studied the vegetation and soil properties of a dry forest that had once been disturbed in central Myanmar using 30 quadrats (20 × 20 m) established in 2012. For 30 species, the overall density was 706 individuals ha−1, and the basal area was 2.92 m2ha−1. The forest was a mosaic of six community types, each of which was dominated by a single species. Dominant species that were capable of resprouting accounted for 47–78% of the total density and 56–83% of the basal area of the communities. We related seven soil properties to the vegetation patterns using canonical correspondence analysis (CCA). The CCA results highlighted remarkable associations of species such asAcacia catechu, Dalbergia paniculata, Terminalia oliveriandMillettia multiflorawith soil texture.Acacia inopinatawas associated with a high soil pH (i.e. 9–10), andTerminalia tomentosawas associated with soil hardness. Our results indicate that secondary succession of a dry forest is not initially led by pioneer species, but instead, by superior competitors capable of resprouting, and that species distributions are primarily determined by the filtering effects of edaphic conditions. We believe that the dry-forest species retain their soil–species relationships despite heavy disturbances.


2016 ◽  
Vol 51 (9) ◽  
pp. 1371-1385 ◽  
Author(s):  
Gustavo Mattos Vasques ◽  
Maurício Rizzato Coelho ◽  
Ricardo Oliveira Dart ◽  
Ronaldo Pereira Oliveira ◽  
Wenceslau Geraldes Teixeira

Abstract The objective of this work was to compare ordinary kriging with regression kriging to map soil properties at different depths in a tropical dry forest area in Brazil. The 11 soil properties evaluated were: organic carbon content and stock; bulk density; clay, sand, and silt contents; cation exchange capacity; pH; water retention at field capacity and at permanent wilting point; and available water. Samples were taken from 327 sites at 0.0-0.10, 0.10-0.20, and 0.20-0.40-m depths, in a tropical dry forest area of 102 km2. Stepwise linear regression models for particle-size fractions and water retention properties had the best fit. Relief and parent material covariates were selected in 31 of the 33 models (11 properties at three depths) and vegetation covariates in 29 models. Based on external validation, ordinary kriging obtained higher accuracy for 21 out of 33 property x depth combinations, indicating that the inclusion of a linear trend model before kriging does not necessarily improve predictions. Therefore, for similar studies, the geostatistical methods employed should be compared on a case-by-case basis.


Mycotaxon ◽  
2018 ◽  
Vol 133 (3) ◽  
pp. 499-512 ◽  
Author(s):  
Magdalena Contreras-Pacheco ◽  
Ricardo Valenzuela ◽  
Tania Raymundo ◽  
Leticia Pacheco

2021 ◽  
Vol 490 ◽  
pp. 119127
Author(s):  
Tobias Fremout ◽  
Evert Thomas ◽  
Kelly Tatiana Bocanegra-González ◽  
Carolina Adriana Aguirre-Morales ◽  
Anjuly Tatiana Morillo-Paz ◽  
...  

2016 ◽  
Vol 77 (3) ◽  
pp. 542-552 ◽  
Author(s):  
J. Mertens ◽  
J. Germer ◽  
J. A. Siqueira Filho ◽  
J. Sauerborn

Abstract Spondias tuberosa Arr., a fructiferous tree endemic to the northeast Brazilian tropical dry forest called Caatinga, accounts for numerous benefits for its ecosystem as well as for the dwellers of the Caatinga. The tree serves as feed for pollinators and dispersers as well as fodder for domestic ruminants, and is a source of additional income for local smallholders and their families. Despite its vantages, it is facing several man-made and natural threats, and it is suspected that S. tuberosa could become extinct. Literature review suggests that S. tuberosa suffers a reduced regeneration leading to population decrease. At this juncture S. tuberosa cannot be considered threatened according to the International Union for Conservation of Nature Red List Categories and Criteria, as it has not yet been assessed and hampered generative regeneration is not considered in the IUCN assessment. The combination of threats, however, may have already caused an extinction debt for S. tuberosa. Due to the observed decline in tree density, a thorough assessment of the S. tuberosa population is recommended, as well as a threat assessment throughout the entire Caatinga.


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