Structure and Function of an Age Series of Poplar Plantations in Central Himalaya: I Dry Matter Dynamics

The study was carried out in a 9-year-old hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) stand over a span of three years from July 1992 to June 1995, primarily to predict litter production from external tree dimensions by combining open-top clothtrap and clipping methods. Litter production was virtually concentrated in October and November. Stem cross-sectional area at the crown base was proved to be the reliable predictor of litter production, and that single regression model was evolved irrespective of year. The regression model had proportional constants of 2.696 • 10 -2 and 3.540 x 10 -2 kg cm -2 year -1 for leaf litter and total litter production, respectively. Utilizing the model, leaf litter production of the stand was assessed to be 5.04, 5.12, and 4.99, and total litter production to be 6.48, 6.58, and 6.40 Mg ha -1 year -1 for the first, second and third year, respectively. Biomass increment was 6.67, 7.80, and 7.70, tree mortality was 0.15, 0.13, and 0.41, and insect grazing was 0.09, 0.05, and 0.002 Mg ha-a year -1 for the first, second and third year, respectively. Above-ground net production was therefore 13.39, 14.55, and 14.51 Mg ha -1 year -1, and biomass accumulation ratio (biomass/net production) was 1.86, 2.21, and 2.76 year for the first, second and third year, respectively. Considering data from earlier studies and the results of this study, biomass accumulation ratio, BAR (year), of hinoki stands was best related to above-ground biomass, y (Mg ha -1), using the power function: BAR = 0.112 y0.936. Excluding seedling stands, leaf efficiency (above-ground net production per unit leaf mass) of hinoki stands was 0.91 -----0.02 (SE) Mg Mg -1 year -1, irrespective of stand biomass or age.

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“…Lodhiyal et al (1995) also found that biomass accumulation ratio for poplar plantations increased with biomass.…”

Section: Discussionmentioning

confidence: 87%

Tree Size Dependence of Litter Production, and Above-ground Net Production in a Young Hinoki (Chamaecyparis obtusa) stand

Adu‐Bredu

Yokota

Ogawa

et al. 1997

Journal of Forest Research

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“…Roots collected from each voxel were brought to the laboratory and categorised into three groups based on size. Although roots are categorized and named differently (Lodhiyal et al, 1995;Laclau, 2003;Tufekcioglu et al, 2003;Das and Chaturvedi, 2005;Fortier et al, 2015a), three categories viz., fine roots (< 2 mm), medium size roots (2 mm to 10 mm) and coarse roots (>10mm) were adopted in the present study.…”

Section: Root Harvestingmentioning

confidence: 99%

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Jha

2017

Not Sci Biol

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In poplar, one of the most used species of forestry and agroforestry, below ground biomass allocation plays an important role in providing anchorage as well as efficient nutrient and water distribution channel. Available literature on this aspect is not enough in hybrid Poplar, Populus euramaricana I-214. Therefore, the study was aimed at finding how this species developed its root system and how much belowground biomass was allocated in Forest System (FRS) and Agroforest System (AFS). This was done using soil excavation and root coring methods. Coarse roots were distributed in all directions but their number and proximal cross section area (CSA) were not uniform. In the case of AFS tree maximum CSA was distributed in the south and south-west direction while in FRS it was in the north-east and south-east direction. Fine roots were observed throughout the rooting zone along with coarse and medium roots up to a maximum depth of 2.4 m in FRS and 2.8 m in AFS. Total belowground biomass was higher in AFS tree (130 kg tree -1 ) than FRS tree (120 kg tree -1 ). But on hectare basis FRS accumulated (24.5 Mg ha ). However, if practiced in surplus agriculture area and considered the system as a whole, AFS allows grain production in lieu of some biomass deficit.

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“…plantations (Lodhiyal et al 1995). Case-study analysis of plot-level biomass changes using temporal repeated scans has also been performed (Liang et al 2012, Srinivasan et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Terrestrial laser scanning as a tool for assessing tree growth

Sheppard¹,

Morhart²,

Hackenberg³

et al. 2017

iForest

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(1) Terrestrial laser scanning (TLS) technology is a powerful tool for assessing tree growth based on time series analysis, as it allows a level of scrutiny not achievable using established destructive techniques. We applied TLS technology to 21 wild cherry trees grown in a research plot near Breisach (southern Germany) in order to build quantitative structure models (QSMs) for each tree. Scans were carried out over three subsequent years (2012-2014), so that three QSMs per each tree were constructed. Using the above approach, we were able to assess the annual growth of the individual wild cherry trees in terms of diameter and height, stem and branch volume, and the merchantable timber fraction. In addition, the growth of single branches of sample trees was detected and quantified. The availability of QSMs based on TLS-derived data allowed the accurate determination of crown length and width, as well as the volume reduction as the result of the tree pruning applied after the first scan (2012). The aboveground biomass (AGB) was assessed for each tree based on the QSM-derived volume and published wood density values for wild cherry, and then compared with AGB values estimated with standard allometric methods, obtaining a very high correlation (r 2 adj = 0.941). We concluded that the proposed approach is an effective non-destructive technique to accurately assess the increase of tree biomass, and discuss its future application in the forestry sector.

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Structure and Function of an Age Series of Poplar Plantations in Central Himalaya: I Dry Matter Dynamics

Cited by 53 publications

References 49 publications

Tree Size Dependence of Litter Production, and Above-ground Net Production in a Young Hinoki (Chamaecyparis obtusa) stand

Tree Size Dependence of Litter Production, and Above-ground Net Production in a Young Hinoki (Chamaecyparis obtusa) stand

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Terrestrial laser scanning as a tool for assessing tree growth

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