Individual tree size inequality enhances aboveground biomass in homegarden agroforestry systems in the dry zone of Sri Lanka

As much as 40% of live biomass in coniferous forests is located belowground, yet the effect of tree density on biomass allocation is poorly understood. We developed allometric equations using traditional harvesting techniques to estimate coarse root biomass for [Formula: see text]13-year-old postfire lodgepole pine trees (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.). We then used these equations, plus estimates of fine root and aboveground biomass, to estimate total tree biomass and belowground to aboveground biomass ratios in young postfire lodgepole pine stands with a wide range of tree densities. Belowground biomass allocation increased with tree density, but the increase was largely determined by inherent differences associated with tree size, not competition. Stand biomass in trees ranged from 46 to 5529 kg·ha1 belowground, from 176 to 9400 kg·ha1 aboveground, and from 222 to 13 685 kg·ha1 for total biomass. For individual trees, the ratio of belowground to total biomass declined with tree size from 0.44 at a basal diameter of 0.5 cm to 0.11 at a basal diameter of 8 cm. This shift in individual tree allocation caused the proportion of total stand biomass in belowground tissues to increase from 19% in low-density stands with larger trees to 31% in high-density stands with small trees.

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Sustainable Agroforestry Systems in Dry Zone of Sri Lanka: A Case Study

Tropics ◽

10.3759/tropics.12.104 ◽

2003 ◽

Vol 12 (2) ◽

pp. 104-114

Author(s):

Herath Jayatissa KUMARA ◽

Rajapaksha UDAYA ◽

Susumu HAYASHI

Keyword(s):

Sri Lanka ◽

Agroforestry Systems ◽

Dry Zone

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Review of the genus Cnemaspis Strauch, 1887 (Sauria: Gekkonidae) in Sri Lanka with the description of five new species

Zootaxa ◽

10.11646/zootaxa.1490.1.1 ◽

2007 ◽

Vol 1490 (1) ◽

pp. 1-63 ◽

Cited By ~ 3

Author(s):

L. J.MENDIS WICKRAMASINGHE ◽

D. A.I. MUNINDRADASA

Keyword(s):

New Species ◽

Sri Lanka ◽

Morphometric Analysis ◽

Mountain Region ◽

Geographical Isolation ◽

Morphological Comparison ◽

Type Series ◽

Dry Zone ◽

High Degree ◽

Wet Zone

Five new species of geckos are described from Sri Lanka by morphological comparison and morphometric analysis leading to review the genus Cnemaspis in the country. The type series of these species were identified from following localities: C. alwisi and C. kumarasinghei from the intermediate zone, C. retigalensis from the dry zone, C. molligodai from the lowland wet zone and C. samanalensis from the mountain region of the wet zone in the country. The high degree of endemicity (90%) shown by Cnemaspis in Sri Lanka could be attributed to geographical isolation. In addition, the taxonomic issue of C. jerdonii scalpensis is discussed and the species C. scalpensis is errected.

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Fluoride releasing kinetics in a weathered bearing biotite gneiss

10.31705/eru.2021.13 ◽

2021 ◽

Author(s):

M.H.Ashan Madusanka ◽

◽

Sandun Sadanayake ◽

lkMeththika Vithanage ◽

◽

...

Keyword(s):

Sri Lanka ◽

Kidney Disease ◽

Dental Fluorosis ◽

Geographic Area ◽

Climatic Conditions ◽

Who Guidelines ◽

Biotite Gneiss ◽

Basement Rocks ◽

Dry Zone ◽

Uncertain Etiology

In several regions of the dry zone of Sri Lanka, excessive quantities of fluoride (F-) in groundwater have affected the water quality significantly. Apart from the well-known prevalence of dental fluorosis, Chronic Kidney Disease of uncertain etiology (CKDu) is widespread in different pockets in the dry zone of Sri Lanka [1]. Fluoride is one of the substances suspected of being causative of CKDu in the area. Since the kidneys retain more F- than in any other soft tissue and excess F- exposure can cause kidney disease. Within the same zone, the prevalence of CKDu varies by geographic area in a ground water and spatial distribution of selected trace elements in groundwater. The optimum F- level in drinking water, according to WHO guidelines, is 1.5 (mg/L); however, due to the unfavorable climatic conditions that exist in tropical countries, people ingest more water than normal intake, resulting in a high F- intake. The source of F- is geogenic. It has been found that the F- content of basement rocks ranges from 9.5×10-5 to 1.44×10-3 kg/L in the region [3]. Farmers consume about 2-3 liters of water a day to quench their thirst, resulting in a daily F- intake of 3×10-3-1×10-2 kg/L [4].

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Aboveground biomass and carbon of the highly diverse Atlantic Forest in Brazil: comparison of alternative individual tree modeling and prediction strategies

Carbon Management ◽

10.1080/17583004.2018.1503040 ◽

2018 ◽

Vol 9 (4) ◽

pp. 383-397 ◽

Cited By ~ 2

Author(s):

Michel Anderson Almeida Colmanetti ◽

Aaron Weiskittel ◽

Luiz Mauro Barbosa ◽

Regina Tomoko Shirasuna ◽

Fernando Cirilo de Lima ◽

...

Keyword(s):

Atlantic Forest ◽

Aboveground Biomass ◽

Individual Tree ◽

Modeling And Prediction ◽

Tree Modeling

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A New Index Representing Individual Tree Competitive Status

Canadian Journal of Forest Research ◽

10.1139/x73-073 ◽

1973 ◽

Vol 3 (4) ◽

pp. 495-500 ◽

Cited By ~ 46

Author(s):

James A. Moore ◽

Carl A. Budelsky ◽

Richard C. Schlesinger

Keyword(s):

Spatial Distribution ◽

Strong Correlation ◽

Basal Area ◽

Tree Size ◽

Competition Index ◽

Individual Tree ◽

Silvicultural Practices ◽

Basal Area Growth ◽

Hardwood Species ◽

Area Growth

A new competition index, modified Area Potentially Available (APA), was tested in a complex unevenaged stand composed of 19 different hardwood species. APA considers tree size, spatial distribution, and distance relationships in quantifying intertree competition and exhibits a strong correlation with individual tree basal area growth. The most important characteristic of APA is its potential for evaluating silvicultural practices.

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