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inter-and intra-specific phenotypic variation of ecological stoichiometric traits in a mixed-oak secondary forest in China

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Journal of Forestry Research 2021年第6期32卷 2333-2347页

作者： Yueyao Feng Xuan Li Biyao Zhou Rong Hu Huanchao Zhang Jiading Yang Yanming Fang Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the EnvironmentKey Laboratory of State Forestry and Grassland Administration on Subtropical Forest Biodiversity ConservationNanjing Forestry UniversityNanjing210037People’s Republic of China College of Forestry Nanjing Forestry UniversityNanjing 210037People’s Republic of China

Ecological stoichiometry provides a framework for the balance and flow of elements between organisms and *** phenotypes have an important influence on the environmental adaptation and ecological evolution of *** have been few reports on inter-and intra-specific phenotypic variations of ecological stoichiometric traits for congeneric species in a mixed forest although such variations are well-documented at the species level at global,regional and local *** this study,total carbon(TC),nitrogen(TN),phosphorus(TP)and potassium(TK)were measured in leaves and the elemental phenotypes were statistically analyzed in four species of oaks—Quercus fabri,*** ***,*** and ***—in a mixed-oak secondary forest in Yushan,Jiangsu,*** average element concentrations in the four oak species were not relatively higher than previously reported for oaks from world and Chinese *** stoichiometry traits were correlated with tree height and diameter at breast height,indicating that phosphorous and potassium were positively correlated with tree size,while carbon was negatively correlated,especially the relationship between oak growth and total carbon or total phosphorus was obvious,and the study concluded that this was because plant growth depended on phosphorus storage and had opposite effects on leaf carbon *** on tree plasticity index and the coefficient of variation,there was medium variation in element *** plasticity index of total carbon levels was the lowest,and that of potassium the *** component analysis and cluster analysis showed that the intra-specific variation among the four oak species was higher than inter-specific *** the perspective of nutrient supply and ecological adaptation,this study creates a foundation for the management of secondary oak forest stands.

关键词： Ecological stoichiometry Quercus Elemental phenotype Intra-specific variation inter-specific variation Ecological evolution Nutrient supply

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DNA barcoding of the fungal genus Neonectria and the discovery of two new species

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Science China(Life Sciences) 2011年第7期54卷 664-674页

作者： ZHAO Peng LUO Jing ZHUANG WenYing LIU XingZhong WU Bing State Key Laboratory of Mycology Institute of Microbiology Chinese Academy of Sciences Beifing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

To determine a suitable DNA barcode for the genus Neonectria,the internal transcribed spacer rDNA,β-tubulin,EF-1α,and RPB2 genes were selected as candidate markers.A total of 205 sequences from 19 species of the genus were ***-and inter-specific divergences and the ease of nucleotide sequence acquisition were treated as criteria to evaluate the feasibility of a DNA *** results indicated that any single gene among the candidate markers failed to serve as a successful barcode,while the combination of the partial EF-1α and RPB2 genes recognized all species *** tentatively propose the combined partial EF-1α and RPB2 genes as a DNA barcode for the *** this study,two cryptic species were discovered,based on the combined data of morphology and DNA barcode *** described and named these two new species *** and ***.

关键词： intra-specific variation inter-specific variation morphology DNA barcode sequence analysis

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