Coarse woody debris in an old-growth deciduous forest on the Cumberland Plateau, southeastern Kentucky

Müller, Robert N.; Liu, Yan

doi:10.1139/x91-218

Cited by 105 publications

(56 citation statements)

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“…The global range in the proportions of CWD mass to forest biomass varies from 10%-40% [42][43][44][45]. However, the datum we observed was 6%-10%, which was slightly lower than the lower limit of the global records.…”

Section: Discussioncontrasting

confidence: 71%

Dynamics of Coarse Woody Debris Characteristics in the Qinling Mountain Forests in China

Yuan

Jose

Zheng

et al. 2017

Forests

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Abstract:Coarse woody debris (CWD) is an essential component in defining the structure and function of forest ecosystems. Long-term dynamics of CWD characteristics not only affect the release rates of chemical elements from CWD, but also the species diversity of inhabiting plants, animals, insects, and microorganisms as well as the overall health of ecosystems. However, few quantitative studies have been done on the long-term dynamics of CWD characteristics in forest ecosystems in China. In this study, we conducted nine tree censuses between 1996 and 2016 at the Huoditang Experimental Forest in the Qinling Mountains of China. We quantified forest biomass including CWD and CWD characteristics such as decay states and diameter classes during this period and correlated with stand, site, and climatic variables. The forest biomass was dominated by live tree biomass (88%); followed by CWD mass (6%-10%). Understory biomass contributed only a small portion (1%-4%) of the overall biomass. Significant differences in average annual increment of CWD mass were found among forest stands of different species (p < 0.0001). Forest biomass, stand age, forest type, aspect, slope, stand density, annual average temperature, and precipitation were all significantly correlated with CWD mass (p < 0.05), with forest type exhibiting the strongest correlation (r 2 = 0.8256). Over time, the annual mass of different CWD characteristics increased linearly from 1996-2016 across all forest types. Our study revealed that forest biomass, including CWD characteristics, varied by forest type. Stand and site characteristics (forest biomass, forest type, aspect, slope and stand density) along with temperature and precipitation played a major role in the dynamics of CWD in the studied forest ecosystems.

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Section: Discussioncontrasting

confidence: 71%

Dynamics of Coarse Woody Debris Characteristics in the Qinling Mountain Forests in China

Yuan

Jose

Zheng

et al. 2017

Forests

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“…In the central hardwood region, much of the research related to old-growth forests has focused on tree size structure, species composition, and woody biomass dynamics from living trees to snags to down wood (Schmelz and Lindsey 1965;McComb and Muller 1983;Parker et al 1985;MacMillan 1988;Parker 1989;Muller and Liu 1991;Runkle 1991;Martin 1992;Shifley et al 1997;Spetich et al 1999). However, little has been done to describe the number and distribution of cavity trees in old-growth forests in this region.…”

Section: Introductionmentioning

confidence: 99%

Distribution of cavity trees in midwestern old-growth and second-growth forests

Fan¹,

Shifley²,

Spetich³

et al. 2003

Can. J. For. Res.

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Abstract:We used classification and regression tree analysis to determine the primary variables associated with the occurrence of cavity trees and the hierarchical structure among those variables. We applied that information to develop logistic models predicting cavity tree probability as a function of diameter, species group, and decay class. Inventories of cavity abundance in old-growth hardwood forests in Missouri, Illinois, and Indiana found that 8-11% of snags had at least one visible cavity (as visually detected from the ground; smallest opening ≥2 cm diameter), about twice the percentage for live trees. Five percent of live trees and snags had cavities on mature (≥110 years) second-growth plots on timberland in Missouri. Because snags accounted for typically no more than 10% of standing trees on any of these sites, 80-85% of cavity trees are living trees. Within the subset of mature and old-growth forests, the presence of cavities was strongly related to tree diameter. Classification and regression tree models indicated that 30 cm diameter at breast height (DBH) was a threshold size useful in distinguishing cavity trees from noncavity trees in the old-growth sample. There were two diameter thresholds in the mature second-growth sample: 18 and 44 cm DBH. Cavity tree probability differed by species group and increased with increasing decay class.Résumé : Nous avons utilisé la classification et l'analyse d'arbres de régression pour identifier les principales variables associées à l'occurrence d'arbres à cavité et la structure hiérarchique entre ces variables. Nous avons utilisé cette information pour développer des modèles de régression logistique visant à prédire la présence de cavités en fonction du diamètre, du groupe d'essences et de la classe de carie de l'arbre. Des inventaires d'abondance de cavités dans des forêts anciennes de feuillus au Missouri, en Illinois et en Indiana ont montré que 8-11 % des chicots ont au moins une cavité visible (détectée par examen visuel à partir du sol; diamètre de la plus petite ouverture ≥2 cm), soit le double du pourcentage correspondant pour les arbres vivants. Cinq pourcent des arbres vivants et des chicots avaient des cavités dans des placettes en forêt de seconde venue mature (≥110 ans) dans les régions boisées au Missouri. Étant donné que les chicots ne comptent typiquement pas pour plus de 10 % des arbres sur pied à chacun de ces sites, 80-85 % des arbres à cavités sont donc des arbres vivants. Si on prend en compte seulement les forêts matures et les forêts anciennes, la présence de cavités est fortement reliée au diamètre de l'arbre. Les modèles de classification et d'arbres de régression indiquent qu'un diamètre à hauteur de poitrine (DHP) de 30 cm constitue une taille seuil pour distinguer les arbres avec cavités de ceux sans cavités dans les forêts anciennes. Dans les forêts de seconde venue, il y a deux seuils : 18 et 44 cm DHP. La probabilité qu'un arbre ait une cavité varie selon les groupes d'essences et augmente avec la classe de carie.[Traduit par la ...

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“…Hence, dry, exposed sites tend to have more C W than moist, protected sites (Muller and Liu 199 1). For similar reasons, more C W occurs in cool deciduous forests than in warm temperate deciduous forests (Muller and Liu 1991).…”

Section: Coarse Woody Debrismentioning

confidence: 99%