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Above-ground woody biomass allocation and within tree carbon and nutrient distribution of wild cherry(Prunus avium L.)-a case study

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Forest Ecosystems 2016年第2期3卷 138-152页

作者： Christopher Morhart Jonathan P. Sheppard johanna k. schuler Heinrich Spieck.r Chair of Forest Growth and Dendroecology Albert-Ludwigs-University Freiburg Tennenbacher Str. 4 D 79106 Freiburg Germany

Back.round： The global search for new ways to sequester carbon has already reached agricultural lands. Such land constitutes a major potential carbon sink. The production of high value timber within agroforestry systems can facilitate an in-situ carbon storage function. This is followed by a potential long term ex- situ carbon sink.ithin long lasting products such as veneer and furniture. For this purpose wild cherry （Prunus avium L.） is an interesting option for middle Europe, yielding high prices on the timber mark.t. Methods： A total number of 39 wild cherry were sampled in 2012 and 2013 to assess the leafless above ground biomass. The complete trees including stem and branches were separated into 1 cm diameter classes. Wood and bark.from sub-samples were analysed separately and nutrient content was derived. Models for biomass estimation were constructed for all tree compartments. Results： The smallest diameter classes possess the highest proportion of bark.due to smaller cross sectional area. Tree boles with a greater amount of stem wood above 10 cm in diameter will have a more constant bark.proportion. Total branch bark.proportion also remains relatively constant above *** measurements of 8 cm. A balance is evident between the production of new branches with a low diameter and high bark.proportion offset by the thick.ning and a relative reduction in bark.proportion in larger branches. The results show that a single tree with an age of 17 and 18 years can store up to 85 k. of carbon within the aboveground biomass portion, an amount that will increase as the tree matures. Branches display greater nutrient content than stem sections per volume unit which can be attributed to a greater bark.proportion. Conclusions： Using the derived models the carbon and the nutrient content of above-ground woody biomass of whole trees can be calculated. Suggested values for carbon with other major and minor nutrients held within relatively immature trees strongly supports the id

关键词： Carbon sequestration Biomass Bark Branch Stem Nutrient content AIIometry Agroforestry

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Modelling growing space of four valuable broadleaved tree species in southern China

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Forestry Studies in China 2013年第3期15卷 167-178页

作者： johanna schuler Josephine CUENI Heinrich SPIECk.R Wen-Fu GUO Faculty of Environment and Natural Resources Albert-Ludwigs-Universitt Sci-Tech Division of the Experimental Centre for Tropical Forestry Chinese Academy of Forestry

We present management tools for growing four valuable broadleaved tree species, indigenous to *** southern China. Crown diameter （CD） of the species studied can be predicted very well by using a model that is so e y a near funct on of d ameter at breast he ght （DBH）. The add t on of tree age （AGE） and yield class （YC） to this-nodel did not significantly improve its predictive capacity. We used species-specific crown diameter models to calcu- ate the amount of growing space and subsequently stand density that each species needs to achieve desired stem ＂adial growth rates. Furthermore we used this information to calculate a ＂distance factor＂, a rule of thumb that roughly ~stimates the distance between two neighboring trees needed to achieve a desired future target diameter. These tools ＇acilitate the planning of thinning regimes by using crown diameter models combined with annual radial growth rates to ;alculate the number of crop trees per hectare required to reach a desired target stem diameter.

关键词： crown diameter diameter growth growth model valuable timber management tool

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