Characteristics of Gaps and Disturbance Regimes of the Alpine Fir Forest in Western Sichuan

Wu, Qiulan; Wu, Fuzhong; Yang, Wei; Tan, Bo; Yang, Yunfeng; Ni, Xiangyin; He, Junjie

doi:10.3724/sp.j.1145.2013.00922

Cited by 25 publications

(22 citation statements)

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“…(Chinese fir) is an evergreen conifer in the Taxodiaceae (Redwood) family. This species was selected because it is one of the most important commercial trees in China32 and because it is grown in a variety of sites. In the first half of 1988 and 1999, twenty-four sites in the Jiangxi Province were selected to investigate tree stem (trunk) growth (Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

A predictive nondestructive model for the covariation of tree height, diameter and stem volume scaling relationships

Zhang

Zhong

Niklas

et al. 2016

Sci Rep

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Metabolic scaling theory (MST) posits that the scaling exponents among plant height H, diameter D, and biomass M will covary across phyletically diverse species. However, the relationships between scaling exponents and normalization constants remain unclear. Therefore, we developed a predictive model for the covariation of H, D, and stem volume V scaling relationships and used data from Chinese fir (Cunninghamia lanceolata) in Jiangxi province, China to test it. As predicted by the model and supported by the data, normalization constants are positively correlated with their associated scaling exponents for D vs. V and H vs. V, whereas normalization constants are negatively correlated with the scaling exponents of H vs. D. The prediction model also yielded reliable estimations of V (mean absolute percentage error = 10.5 ± 0.32 SE across 12 model calibrated sites). These results (1) support a totally new covariation scaling model, (2) indicate that differences in stem volume scaling relationships at the intra-specific level are driven by anatomical or ecophysiological responses to site quality and/or management practices, and (3) provide an accurate non-destructive method for predicting Chinese fir stem volume.

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Section: Methodsmentioning

confidence: 99%

A predictive nondestructive model for the covariation of tree height, diameter and stem volume scaling relationships

Zhang

Zhong

Niklas

et al. 2016

Sci Rep

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“…Snow begins to accumulate on October and melts on April of the following year with a highest depth approximately 50 cm (Tan et al 2013 A c c e p t e d M a n u s c r i p t 7 (Rhododendron lapponicum). Canopy gap (a "hole" that plant height down to 2 m) and expanded gap (canopy gap plus the area that expands to the bases of surrounding canopy trees) cover 13% and 23%, respectively, of the experimental site (Wu et al 2014). The soil is classified as Cambisol (World Reference Base taxonomy).…”

Section: Site Descriptionmentioning

confidence: 99%

Copper and zinc dynamics in foliar litter during decomposition from gap center to closed canopy in an alpine forest

Yang

et al. 2015

Scandinavian Journal of Forest Research

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Forest gap in alpine forests may redistribute the hydrothermal conditions in winter and growing season, which may affect the releases of copper and zinc in foliar litter during decomposition. However, the details of this process are largely unknown. Foliar litters of willow (Salix paraplesia), larch (Larix mastersiana), fir (Abies faxoniana), azalea (Rhododendron lapponicum), birch (Betula albosinensis) and cypress (Sabina saltuaria) were selected in an alpine forest of eastern Tibetan Plateau. The litterbags were placed on the forest floor from gap center, canopy gap edge and expanded gap edge to closed canopy. Zinc and copper contents were studied as litter decomposition proceeded. After one year of decomposition, zinc accumulated in all foliar litters regardless of gap positions, but copper accumulated in the litters of fir, azalea and cypress. Separately, copper released from all foliar litters in winter, whereas zinc in litters of larch, azalea, birch and cypress released in winter. Moreover, both copper and zinc accumulated during the growing season regardless of litter species. Nevertheless, higher accumulation rates were observed under closed canopy compared with other gap positions. These results suggest that forest gap slows the releases of copper and zinc in foliar litter during forest regeneration in these cold biomes.

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“…The annual litter fall is 2380 kg ha -1 year -1 (Fu et al 2017). Forest gaps cover 23% of the landscape in this alpine forest (Wu et al 2013).…”

Section: Experimental Sitementioning

confidence: 99%

Formation of forest gaps accelerates C, N and P release from foliar litter during 4 years of decomposition in an alpine forest

Berg

Yang

et al. 2018

Biogeochemistry

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Relative to areas under canopy, the soils in forest gaps receive more irradiance and rainfall (snowfall); this change in microclimate induced by forest gaps may influence the release of carbon (C) and nutrients during litter decomposition. However, great uncertainty remains about the effects of forest gaps on litter decomposition. In this study, we incubated foliar litters from six tree and shrub species in forest gaps and canopy plots and measured the release of C, nitrogen (N) and phosphorus (P) in different snow cover periods in an alpine forest from 2012 to 2016. We found that N was retained by 24-46% but that P was immediately released during an early stage of decomposition. However, forest gaps decreased litter N retention, resulting in more N and P being released from decomposing litters for certain species (i.e., larch, birch and willow litters). Moreover, the release of C and nutrients during litter decomposition stimulated by forest gaps was primarily driven by warmer soil temperature in this high-altitude forest. We conclude that gap formation during forest regeneration may accelerate C turnover and nutrient cycling and that this stimulation might be regulated by the litter species in this seasonally snow-covered forest.

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Characteristics of Gaps and Disturbance Regimes of the Alpine Fir Forest in Western Sichuan

Cited by 25 publications

References 0 publications

A predictive nondestructive model for the covariation of tree height, diameter and stem volume scaling relationships

A predictive nondestructive model for the covariation of tree height, diameter and stem volume scaling relationships

Copper and zinc dynamics in foliar litter during decomposition from gap center to closed canopy in an alpine forest

Formation of forest gaps accelerates C, N and P release from foliar litter during 4 years of decomposition in an alpine forest

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