Comparison of fixed area and distance sampling methods in open forests: case study of Zagros Forest, Iran

Mirzaei, Mehrdad; Bonyad, Amir Eslam

doi:10.1007/s11676-016-0239-9

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Where d6 is tree diameter of the sixth tree in meter unit while π is a constant of 3.14 that commonly used for calculating the area of the circular plot. Some literature also confirms the use of N-trees sampling method for facilitating forest inventory demonstrates an equal accuracy with other approaches as long as it is applied in a plantation forest with monoculture species (Basiri et al, 2018;Mirzaei and Eslam, 2016).…”

Section: Study Locationmentioning

confidence: 90%

Soil chemical properties influences on the growth performance of Eucalyptus urophylla planted in dryland ecosystems, East Nusa Tenggara

Sadono

Wardhana

Wirabuana

et al. 2020

J.Degrade.Min.Land Manage.

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Understanding the relationship between soil chemical characteristics and forest productivity is importantly required to support sustainable forest management, mainly in eucalyptus plantation. This study investigated the influence of soil chemical properties on the growth performance of Eucalyptus urophylla which established in dryland ecosystems, East Nusa Tenggara. Forest inventory was undertaken by N-trees sampling in the priority locations for E. urophylla development, located in Buat, Fatukoto1, and Fatukoto2. Four parameters were selected to describe the growth performance of E. urophylla, comprising diameter, height, volume, and mean annual increment. In each sampling point, soil sample was collected at the depths of 0-10, 11-20, and 21-30 cm. Then, the sample was composited before brought to the laboratory for quality analysis. Six parameters were selected to quantify the soil chemical characteristics, namely soil acidity (pH), soil organic carbon (SOC), total nitrogen (TN), available phosphorus (Av-P), exchangeable potassium (Exc-K), and cation exchange capacity (CEC). Results found that soil chemical properties from three locations were significantly different in pH, SOC, Av-P, and CEC. However, this study recorded the content of TN and Exc-K were statistically equal among the three sites. Difference soil chemical properties were also followed by the variation growth of E. urophylla, particularly in diameter and height. The highest volume of eucalyptus stand was observed in Fatukoto1 (181.06+95.46 m3 ha-1), followed by Buat (142.67+27.19 m3 ha-1) and FatukotoII (99.09+62.46 m3 ha-1). There were four soil parameters that meaningfully affected the growth performance of E. urophylla, i.e. pH, Av-P, Exc-K, and CEC. Among those parameters, Av-P demonstrated a consistent effect on the growth performance of E. urophylla. According to these findings, this study concluded that Av-P substantially provided higher effect on the growth performance of E. urophylla than other soil chemical parameters.

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Section: Study Locationmentioning

confidence: 90%

Soil chemical properties influences on the growth performance of Eucalyptus urophylla planted in dryland ecosystems, East Nusa Tenggara

Sadono

Wardhana

Wirabuana

et al. 2020

J.Degrade.Min.Land Manage.

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“…The density of endemic tree D. cinereus and H. bancana were 8.4±3.79 individual/ha and 3.48±2.78 individual/ha, respectively. Distance sampling has many advantages than other methods, including more economical, statistically defensible, and more practical in quantitating plant species characteristics [20]. The present study showed that distance sampling using line-transect could be effectively used to survey the population status and estimate the species density of Dipterocarpaceae species in Mursala Island.…”

Section: A Species Richness and Distributionmentioning

confidence: 77%

High Species Diversity of the Family Dipterocarpaceae in Mursala Island, Indonesia

Robiansyah¹,

Hamidi²,

Randi³

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Known to have a long history of timber extraction, Mursala Island on the west coast of North Sumatra Province is a small island home to the endemic tree Dipterocarpus cinereus and many other Dipterocarpaceae species. In the present study, distance sampling using line-transect was used to assess the species diversity and population status of Dipterocarpaceae species on the Island. A total of 26 Dipterocarpaceae species from 6 genera was identified from Mursala Island. The genus that was represented by the highest number of species was Shorea (13 species), followed by Vatica (5), Dipterocarpus (4), Hopea (2), Cotylelobium (1) and Dryobalanops (1). Among these, two Mursala Island endemic were identified: D. cinereus and H. bancana. Furthermore, according to IUCN Red List category, 11 species (42.3%) were classified as critically endangered, four species (15.4%) were of endangered, 5 species (15.2%) were of vulnerable, one species was of near threatened, 2 species were of least concern and 3 species were not assessed yet. Based on distance analysis, the species with the highest individual density was S. multiflora (21.72±10.96 individual/ha), whereas species with the lowest density was S. johorensis (0.06±0.01 individual/ha). Two main threats for Dipterocarpaceae species in Mursala Island were observed during the survey: illegal logging and habitat conversion. Increasing the protection level of the island was recommended to conserve all the species of Dipterocarpaceae. Besides, providing alternative sources of living for the illegal logger through commercialization of non-timber forest products, ecotourism, and the sustainable fishery was recommended so that they could stop illegal logging activity.

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“…Data collection was undertaken by a field inventory using N-trees sampling method. In this sampling technique, the process of tree measurement was conducted at the nearest trees from the center point (Mirzaei and Eslam, 2016). The principle of this method is similar to the point-centered quarter method, which is frequently used in ecological surveys, primarily for tree vegetation (Haxtema et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

Competition Influences Tree Dimension, Biomass Distribution, and Leaf Area Index of Eucalyptus Urophylla in Dryland Ecosystems at East Nusa Tenggara

WIRABUANA¹,

SADONO²,

MATATULA³

2022

AgricultForest

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Competition is one of the important factors that determine the productivity of forest stands. However, the effect of competition on the growth dynamics at the individual tree level is rarely documented. This study investigated the influence of competition on the tree dimension, biomass, distribution, and leaf area index (LAI) of Eucalyptus urophylla established in dryland ecosystems in East Nusa Tenggara. Data collection was conducted by N-tree sampling method with the number of center points reaching 36 units. The competition among trees was quantified using Hegyi index. Several parameters were measured to describe tree characteristics, including diameter, height, aboveground biomass, and LAI. The results demonstrated a significant influence of competition on the tree dimension, biomass distribution, and LAI of E. urophylla. The individual tree performance declined along with the increase in competition. By contrast, the increased competition gradually improved the relative contribution of branch biomass to the total aboveground biomass. The exponential model best described the linkage between competition and the tree characteristics of E. urophylla in the study site. Referring to these findings, this study concluded that the growth dynamics of E. urophylla at the individual tree level in dryland ecosystems is substantially influenced by competition.

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Comparison of fixed area and distance sampling methods in open forests: case study of Zagros Forest, Iran

Cited by 4 publications

References 8 publications

Soil chemical properties influences on the growth performance of Eucalyptus urophylla planted in dryland ecosystems, East Nusa Tenggara

Soil chemical properties influences on the growth performance of Eucalyptus urophylla planted in dryland ecosystems, East Nusa Tenggara

High Species Diversity of the Family Dipterocarpaceae in Mursala Island, Indonesia

Competition Influences Tree Dimension, Biomass Distribution, and Leaf Area Index of Eucalyptus Urophylla in Dryland Ecosystems at East Nusa Tenggara

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