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Absorptive root-multidimension strategy links air temperature and species distribution in a montane forest

Forest Ecosystems 2023年第3期10卷 307-315页

作者： Zuhua Wang Min Liu Long Li Jianwei Hou Xiaodong Zhang Haibo Li Chuandong Yang Lilin Yang College of A&F Engineering and Planning Tongren UniversityTongren554300GuizhouChina Guizhou Provincial Key Laboratory for Biodiversity Conservation and Utilization in the Fanjing Mountain Region Tongren UniversityTongren554300GuizhouChina National Nature Reserve Administration of Fanjing Mountain Tongren554400GuizhouChina

Background: Air temperature affects absorptive root traits, which are closely related to species ***, it is still unclear how air temperature regulates species distribution through changes in absorptive root traits. Seven functional traits of the absorptive roots of 240 individuals of 52 species, soil properties and air temperature were measured along an elevational gradient on mt. fanjingshan, Tongren City, Guizhou, and then the direct and indirect effects of these controls on species distribution were ***: Absorptive roots adapted to air temperature with two strategies. The first strategy was positively associated with the specific root area(SRA) and specific root length(SRL) and was negatively associated with the root tissue density(RTD), representing the classic root economics spectrum(RES). The second strategy was represented by the trade-off between root diameter, mycorrhizal fungi colonization(MF) and SRL, representing the collaboration gradient with “do it yourself” resource uptake ranging from “outsourcing” to mycorrhizal resource uptake. Air temperature regulated species distribution in six ways: directly reducing species importance value;indirectly increasing the species importance value by reducing soil nitrogen content or increasing soil pH by reducing soil moisture inducing absorptive roots to change from “do it yourself” resource absorption to “outsourcing” resource absorption;indirectly decreasing the species importance value by decreasing soil moisture to change from“outsourcing”resource absorption to “do it yourself” resource absorption;indirectly increasing the species importance value with increasing soil pH by reducing soil moisture resulting in absorptive root traits turning into nutrient foraging traits;and indirectly decreasing the species importance value by promoting absorptive root traits to nutrient conservation ***: Absorptive root traits play a crucial role in the regulation of species distri

关键词： Air temperature Absorptive roots Functional traits Structural equation models mt.fanjingshan

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Elevation gradient distribution of indices of tree population in a montane forest:The role of leaf traits and the environment

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Forest Ecosystems 2022年第1期9卷 124-130页

作者： Zuhua Wang Rong Zheng Lilin Yang Tinghong Tan Haibo Li Min Liu College of A&F Engineering and Planning Tongren UniversityTongren 554300GuizhouChina Guizhou Provincial Key Laboratory for Biodiversity Conservation and Utilization in the Fanjing Mountain Region Tongren UniversityTongren 554300GuizhouChina College of Life and Technology Inner Mongolia Normal UniversityHohhot 010022Inner MongoliaChina National Nature Reserve Administration of Fanjing Mountain Tongren 554400GuizhouChina

Background:To disentangle the controls on species distribution in the context of climate change is a central element in proposed strategies to maintain species ***,previous studies have focused mainly on the roles of abiotic factors(e.g.,climate and soil properties),with much less attention given to the roles of biotic factors such as functional ***,we measured eight leaf traits for 240 individual trees of 53 species and analyzed the variation in traits and population composition indices and their relationships with soil properties,climate factors,and leaf ***:The tree density,frequency and species importance values of the overall species and saplings significantly increased with increasing elevation,while the same indices(except for species frequency)of adults did not significantly *** largest percentage of variation of species importance value(greater than 50%)was explained by climate,but leaf traits played a critical role in driving elevation distribution patterns of both saplings and adults;the abundance of saplings significantly increased with elevation,with increased leaf carbon contents,while the abundance of adults did not change in accordance with a nutrient conservation strategy associated with the leaf economic ***:Our results suggest that the elevation gradient distribution of woody plant species is dependent on tree size and that local atmospheric humidity and leaf traits cause considerable variation in species distribution along subtropical mountain *** provide evidence of which leaf traits play a key role in the elevation gradient distribution of different sizes of woody tree species.

关键词： Elevation gradient Species distribution Leaf traits Climate change Leaf economic spectrum mt.fanjingshan

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