Global Forest Resources Assessments

Singh, Karan Deo

doi:10.1007/978-3-642-32292-1_19

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…The high deforestation rates in Ecuador, mainly because of conversion to pastures (Singh, 2010;Mosandl et al, 2008) and subsequent unsustainable pasture management (Roos et al, 2013) have resulted in the loss of surface soil organic matter and exchangeable cations, and thus a loss in soil fertility (Mainville et al, 2006). As a consequence, nutrient-poor and…”

Section: Introductionmentioning

confidence: 99%

Does biochar improve nutrient availability in Ultisols of tree plantations in the Ecuadorian Amazonia?

Sarango

Leimer

Manosalvas

et al. 2022

Soil Science Soc of Amer J

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The application of biochar to strongly weathered soils is thought to supply nutrients and improve nutrient retention. We hypothesized that biochar increases (a) total N, bioavailable macronutrient (NH 4 -N, P, K, Ca, Mg), micronutrient (Fe, Mn, Zn, Cu), and plant-beneficial Na concentrations; and (b) nutrient retention in the topsoil. We grew the native leguminous Brazilian firetree [Schizolobium parahyba var. amazonicum (Ducke) Barneby] and the exotic beechwood (Gmelina arborea Roxb.) in a full factorial split-split-plot design at La Victoria and Los Zapotes, Ecuadorian Amazonia. The treatments included amendment of mineral fertilizer plus lime, 3 and 6 t ha −1 biochar (locally produced charcoal), and a control. We sampled the 0-to-0.25-and 0.25-to-0.50-m soil depth layers before the start of the experiment in 2009 and six times until 2013. The site at Los Zapotes was more fertile as reflected by a significant site effect on most studied soil properties in both depth layers. Biochar increased modified Olsen (NaHCO 3 +EDTA)-extractable Ca (p < .05) and Zn concentrations (p < .1) and total N concentrations (p < .05) in topsoil. Mineral fertilizer plus lime increased Olsen-extractable P, K, Ca, Mg, and Zn concentrations (all p < .05) but reduced Olsen-extractable Fe concentrations (p < .05) in topsoil. Biochar increased Ca (p < 0.1) and Zn (p < .05) retention in mineral fertilized topsoils but decreased total N retention (p < .05) in unfertilized topsoils. The amendment of up to 6 t ha −1 biochar did not increase the fertility of the studied degraded Amazonian Ultisols sufficiently to enhance tree growth.

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Section: Introductionmentioning

confidence: 99%

Does biochar improve nutrient availability in Ultisols of tree plantations in the Ecuadorian Amazonia?

Sarango

Leimer

Manosalvas

et al. 2022

Soil Science Soc of Amer J

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“…Male 22 11 9 42 Female 12 3 6 21 18 years 10 2 1 13 Total 34 14 15 63 Secondary data were obtained through a literature review of several documents that discussed NTFPs, D. cinnabari trees, and their resin [1,[40][41][42][43][44][45][46][47]. The local management system was assessed using forest resource assessment (FRA) 2000 terminology [48]. To shed light on forest utilization and product marketing, the value chain analysis (VCA) and arena, actors, and institutions (A2I) approach were used to explain the interactions between actors in specific arena and all institutions arrangements that organize these interactions [49][50][51][52].…”

Section: Data Collectionmentioning

confidence: 99%

Local Management System of Dragon’s Blood Tree (Dracaena cinnabari Balf. f.) Resin in Firmihin Forest, Socotra Island, Yemen

Al-Okaishi

2020

Forests

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Various nontimber forest products (NTFPs) are produced from the forests and woodlands of Yemen. Dragon’s blood tree resin is one of the commercial NTFPs in Yemen and is produced by tapping Dracaena cinnabari trees, which are listed as vulnerable by the IUCN (International Union for Conservation of Nature) Red List. By applying a forest resource assessment, the present study inventoried the D. cinnabari forest with the aim of identifying and evaluating its structure, the harvesting status of the resin, and the current management system. The study was conducted in the Firmihin forest, Socotra Island, Yemen Republic. The forest resource assessment was carried out through a forest inventory by measuring trees from 12 plots following stratified random sampling. The relevant parameters of a total of 819 trees were measured, including the tree height, stem height of lowest branches, height of the highest wound, diameter at breast height (DBH), and presence of wounds. The wounds were measured on a total of 401 trees. Value chain analysis (VCA) was used to clarify the flow of dragon’s blood tree resin from the producers to the local, national, and international markets. Traditional management was examined using questionnaires in the case study area and surrounding villages. There are two tapping techniques: (1) collecting the pure dragon’s blood tree resin and (2) cutting part of the bark along with the pure resin. The second technique resulted in 84% of the trees having wounds. The tappers were mostly from the community in and around the forest. The study found that the traditional management system of tapping dragon’s blood tree resin is not sustainable.

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“…However, these forests are under intense pressure from the effects of uncontrolled harvesting and subsequent conversion of the land to agriculture. Between 1990 and 2015, the worldwide area of tropical forest declined by approximately 195 million ha [4]. Logging creates canopy gaps that may be invaded by vines and pioneer species.…”

Section: Introductionmentioning

confidence: 99%

The Long-Term Survival and Growth of Enrichment Plantings in Logged Tropical Rainforest in North Queensland, Australia

Quang

Baynes

Herbohn

et al. 2020

Forests

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Enrichment planting is often suggested as a means of enhancing the productivity of logged rainforest. However, little is known about the long-term survival and growth of these trees. In this study, we used historical data from enrichment planting trials ranging from 15 to 32 years old to examine the survival and growth of 16 tree species across different sites in north Queensland, Australia. The results complement and extend current knowledge on the potential role of enrichment planting from a production perspective. A key finding was that the initial level of post-logging overwood did not appear to affect the immediate survival of enrichment plantings, but in the longer term (up to 30 years) survival decreased as post-logging overwood and regrowth increased. This suggests that removal of overwood should take place at the time of enrichment planting. A further key finding was that despite regular tending to remove vegetation adjacent to the plantings, competition from saplings and trees that were situated outside the tended area emerged as a major source of competition in some plots. By implication, the success of enrichment planting may depend on removal of competition from the entire logged area, not just adjacent to enrichment plantings. Results between individual species and trials varied widely. The best development of Flindersia brayleyana resulted in a mean tree diameter of 32.5 cm at age 22 for the 100 tallest trees per hectare. Although Eucalyptus grandis, Eucalyptus microcorys, and Eucalyptus pilularis all failed—as expected, because they do not normally grow in rainforest—Corymbia torelliana, Cardwellia sublimis, Araucaria bidwillii, Khaya senegalensis, Flindersia amboinensis, and Swietenia macrophylla also failed although they grow naturally in similar sites. In other trials, tree height and basal area growth were often poor. For example, Khaya ivorensis grew to a basal area of only 1.3 m2/ha and a mean height of 7.7 m at age 10, and Flindersia ifflaiana only grew to a basal area of 0.7 m2/ha and a height of 7.9 m, also at age 10. Overall, these results emphasise the necessity of site–species matching before enrichment planting begins and the necessity of post-planting monitoring and remedial tending.

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Global Forest Resources Assessments

Cited by 6 publications

References 1 publication

Does biochar improve nutrient availability in Ultisols of tree plantations in the Ecuadorian Amazonia?

Does biochar improve nutrient availability in Ultisols of tree plantations in the Ecuadorian Amazonia?

Local Management System of Dragon’s Blood Tree (Dracaena cinnabari Balf. f.) Resin in Firmihin Forest, Socotra Island, Yemen

The Long-Term Survival and Growth of Enrichment Plantings in Logged Tropical Rainforest in North Queensland, Australia

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