Sampling methods for titica vine (Heteropsis spp.) inventory in a tropical forest

Klauberg, Carine; Vidal, Edson; Silva, Carlos Alberto; Bentes, Michelliny de M.; Hudak, Andrew T.

doi:10.1007/s13595-016-0565-2

Cited by 5 publications

(6 citation statements)

References 25 publications

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“…In the sites evaluated in the present study there was a low occurrence of titica vine when compared to other sites where similar inventories have been done (Hoff man, 1997;Plowden et al, 2003;Bentes-Gamaet al, 2013;Klauberg et al, 2016). For large areas, similar to those in the present study, there is a reduction in the density of hosts of titica vine, as observed in the Jaú National Park in the state of Amazonas where only 1 to 5 trees.ha -1 that are hosts of titica vine were found (Durigan, 1998).…”

Section: Characterization Of Host Species and Production Of Titica Vinesupporting

confidence: 63%

POPULATION STRUCTURE OF Heteropsis spp. Kunth (TITICA VINE) IN THE TAPAJÓS NATIONAL FOREST, PARÁ-BRAZIL

et al. 2019

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The objective of the present study was to analyze the ecological aspects of Heteropsis spp. Kunth (titica vine) in an area maintained under forest management conditions. The study was carried out in the Tapajós National Forest, Pará state, Brazil, at Annual Production Unit 11. For the inventory of trees hosting titica vine, 206.25 hectares were covered. The parameters recorded were diameter at breast height - DBH (1.30 m above the soil), total height (Ht), regional name and geographical coordinates. The mature and immature aerial roots of titica vine were counted and the mass of mature roots with and without bark was collected and measured. The density of the host trees in different class centers of DBH and Ht was related. The ratio between the DBH and Ht of the host trees and the mass of mature root with bark of the titica vine was calculated. Spatial distribution was based on Ripley’s K function. A total of 337 trees were inventoried as hosts, with average density of 1.65 trees.ha-1, distributed in 88 species. Trees with DBH <30 cm were the ones that host most titica vines. Trees with 10 m ≤ Ht <15 m host more titica vines when compared to trees with Ht ≥ 25 m. Trees with higher DBH and Ht have the highest number of titica vine roots. The individuals of titica vine had 585 roots.ha-1, leading to an average production of 2.1 kg.ha-1 of titica vine with bark, declining after processing to 0.6 kg. ha-1. It was concluded that the titica vine has no preference for host tree species and that the spatial distribution tends to be aggregated.

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Section: Characterization Of Host Species and Production Of Titica Vinesupporting

confidence: 63%

POPULATION STRUCTURE OF Heteropsis spp. Kunth (TITICA VINE) IN THE TAPAJÓS NATIONAL FOREST, PARÁ-BRAZIL

et al. 2019

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“…Caso a opção seja formar unidades amostrais dentro da UT de 9 ha, essas devem ser implantadas, sistematicamente ou seguindo uma combinação (sistemática e aleatória), para representar com maior confiança a população de cipó-titica na UT. De acordo com KLAUBERG et al (2016), as unidades amostrais devem ter de 250 m² a 300 m², com intensidades de amostragem de 15% a 20% da área total, fazendo-se uma estimativa para a UT.…”

Section: Inventário Das Plantas E Das Raízes De Cipó-titicaunclassified

Inventário De Cipó-Titica Para Subsidiar O Manejo Da Espécie

Lira-Guedes¹,

Silva-Júnior²,

Rosário³

et al. 2021

Produtos Florestais Não Madeireiros: Tecnologia, Mercado, Pesquisas E Atualidades

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“…2) were computed before the calculation of sampling error % (Eq. 3) [3,44,45,46,47], also referred to as uncertainty level [6]. The smaller the uncertainty around the sample mean, the more precise the sampling scheme.…”

Section: Population Mean Variance =mentioning

confidence: 99%

“…The screening of schemes led to the characterisation of sampling protocols that minimise sampling error to enhance accuracy [44]. A desired precision level (uncertainty %) was set to be ≤ 25% which is adequate for inventories targeting multiple attributes, e.g.…”

Section: Se = √mentioning

confidence: 99%

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Evaluating Efficiency of Sampling Schemes in Tropical Natural Forests: Review and Simulation Experience from Kenya

Hitimana

Bekuta

Kiyiapi

2019

AJRAF

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Forest measurements, especially in natural forests are cumbersome and complex. 100% enumeration is costly and inefficient. This study sought to find out reliable, efficient and cost-effective sampling schemes for use in tropical rain forest (TRF), moist montane forest (MMF) and dry woodland forest (DWF) in Kenya. Forty-eight sampling schemes (each combining sampling intensity (5, 10, 20, 30%), plot size (25, 50, 100, 400 m2) and sampling technique (simple random sampling, systematic sampling along North-South and along East-West orientations) were generated for testing estimates of forest attributes such as regeneration through simulation using R-software. Sampling error and effort were used to measure efficiency of each sampling scheme in relation to actual values. Though forest sites differed in biophysical characteristics, cost of sampling increased with decreasing plot size regardless of the forest type and attribute. Accuracy of inventory increased with decreasing plot size. Plot sizes that captured inherent variability were 5mx5m for regeneration and trees ha-1 across forest types but varied between forest types for basal area. Different sampling schemes were ranked for relative efficiency through simulation techniques, using regeneration as an example. In many instances systematic sampling-based sampling schemes were most effective. Sub-sampling in one-hectare forest unit gave reliable results in TRF (e.g. SSV-5mx5m-30%) and DWF (e.g. SSV-10mx10m-30%) but not in MMF (5mx5m-100%). One-hectare-complete-inventory method was found inevitable for regeneration assessment in montane forest.

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Sampling methods for titica vine (Heteropsis spp.) inventory in a tropical forest

Cited by 5 publications

References 25 publications

POPULATION STRUCTURE OF Heteropsis spp. Kunth (TITICA VINE) IN THE TAPAJÓS NATIONAL FOREST, PARÁ-BRAZIL

POPULATION STRUCTURE OF Heteropsis spp. Kunth (TITICA VINE) IN THE TAPAJÓS NATIONAL FOREST, PARÁ-BRAZIL

Inventário De Cipó-Titica Para Subsidiar O Manejo Da Espécie

Evaluating Efficiency of Sampling Schemes in Tropical Natural Forests: Review and Simulation Experience from Kenya

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