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Some Results on Generalized Degree Distance

Open Journal of Discrete Mathematics 2013年第3期3卷 143-150页

作者： Asma Hamzeh ali iranmanesh Samaneh Hossein-Zadeh Department of Mathematics Faculty of Mathematical Sciences Tarbiat Modares University Tehran Iran

In [1], Hamzeh, iranmanesh and Hossein-Zadeh and M. V. Diudea recently introduced the generalized degree distance of graphs. In this paper, we present explicit formulas for this new graph invariant of the Cartesian product, composition, join, disjunction and symmetric difference of graphs and introduce generalized and modified generalized degree distance polynomials of graphs, such that their first derivatives at x = 1 are respectively, equal to the generalized degree distance and the modified generalized degree distance. These polynomials are related to Wiener-type invariant polynomial of graphs.

关键词： Generalized Degree Distance Cartesian Product Join Symmetric Difference Composition Disjunction

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Biomass and carbon stocks in three types of Persian oak(Quercus brantii ***)of Zagros forests in a semi-arid area,Iran

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Journal of Arid Land 2020年第5期12卷 766-774页

作者： ali MAHDAVI Soghra SAIDI Yaghob iranmanesh Mostafa NADERI Faculty of Agriculture and Natural Resources Ilam UniversityIlam 69315516Iran Research Division of Natural Resources Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education CenterAREEOShahrekord ***Iran

Persian oak(Quercus brantii ***)is a dominant tree species of Zagros forests in a semi-arid area,western ***,the capacity of biomass and carbon stocks of these forests is not well *** selected three types of oak,i.e.,seed-originated oak,coppice oak and mixed(seed-originated and coppice)oak of Zagros forests in Dalab valley,Ilam Province,Iran to survey the capacity of biomass and carbon stocks in *** plots with an area of 1000 m2 were systematically and randomly assigned to each type of *** characteristics of trees,such as diameter at breast height(DBH),height,crown diameter and the number of sprouts in each plot were ***,aboveground biomass(AGB),belowground biomass(BGB),aboveground carbon stock(AGCS)and belowground carbon stock(BGCS)of each tree in plots were calculated using allometric *** litterfall biomass(LFB)and litterfall carbon stock(LFCS)were measured in a quadrat with 1 m×1 m in each ***-way analysis of variance and Duncan's test were performed to detect the differences in biomass and carbon stocks among three types of *** showed that AGB,BGB and BGCS were significantly different among three types of *** highest values of AGB,AGCS,BGB and BGCS in seed-originated oak were 76,043.25,14,725.55,36,737.79 and 7362.77 kg/hm2,***,the highest values of LFB and LFCS in seed-originated oak were 3298.33 and 1520.48 kg/hm2,respectively,which were significantly higher than those of the other two types of *** results imply the significant role of seed-originated oak for the regeneration of Zagros *** conservation strategy of seed-originated oak is an important step in the sustainable management of Zagros forests in Iran.

关键词： biomass carbon stock seed-originated forest coppice forest Zagros forest

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Early differentiation in biomass production and carbon sequestration of white poplar and its two hybrids in Central Iran

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Journal of Forestry Research 2015年第1期26卷 65-69页

作者： Hormoz Sohrabi Mohammad Kazem Parsapour ali Soltani Yaghoub iranmanesh Department of Forestry Faculty of Natural Resources and Marine SciencesTarbiat Modares University Department of Forestry Faculty of Natural Resources and Earth ScienceUniversity of ShahrekordShahrekordIran Research Center of Agriculture and Natural Resources ShahrekordChahar-Mahal and BakhtiariIran

We assessed the potential of white poplar（Populus alba L.） and its inter-sectional hybridization with euphrates poplar（P. euphratica Oliv.） for carbon storage and sequestration in central Iran. Trials were established at planting density of 2,500 trees per hectare in block randomized design with three replicates. After 6 years, we measured the above-ground biomass of tree components（trunk, branch, bark, twig and leaf）, and assessed soil carbon at three depths. P. alba 9 euphratica plantation stored significantly more carbon（22.3 t ha-1） than P. alba（16.7 t ha-1） and P. euphratica 9 alba（13.1 t ha-1）.Most of the carbon was accumulated in the above-ground biomass（61.1 % in P. alba, 72.4 % in P. alba 9 euphratica and 56.0 % in P. euphratica 9 alba）. There was no significant difference in soil carbon storage. Also, biomass allocation was different between white poplar P. alba and its inter-sectional hybridization. Therefore, there was a yield difference due to genomic imprinting, which increased the possibility that paternally and maternally inherited wood production alleles would be differentially expressed in the new crossing.

关键词： Carbon storage Hybridization Biomass allocation Euphrates poplar Populus alba 9 euphratica

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