Influence of root structure on root survivorship: an analysis of 18 tree species using a minirhizotron method |
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Authors: | Jiacun Gu Shuiqiang Yu Yue Sun Zhengquan Wang Dali Guo |
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Institution: | (1) Key Laboratory of Forest Tree Genetic Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, Harbin, 150040, People’s Republic of China;(2) College of Forest Resources and Environment, Nanjing Forestry University, Nanjing, 210037, People’s Republic of China;(3) Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, People’s Republic of China;(4) Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, People’s Republic of China;(5) The Key Laboratory of Science and Technology of Urban Environment, Peking University Shenzhen Graduate School, Shenzhen, 518055, People’s Republic of China; |
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Abstract: | Fine root survivorship is an important aspect of root ecology and is known to be influenced by a suite of covariates. However,
the relative importance of each covariate on root survivorship is not clear. Here, we used minirhizotron-based data from 18
woody species to evaluate the relative strength of influence on root survivorship by root diameter, branch order, soil depth,
and season of root birth, and to examine how the relationship between each covariate and root survivorship differed across
species. We extracted hazard ratio estimates for 16 species from published studies that performed Cox proportional hazards
regression analysis, and from our own unpublished data for two Chinese temperate tree species. The mean change in hazard ratio
(CHR) and corresponding coefficient of variation for each factor were calculated across species. On average, root diameter
and season of root birth had stronger effects on root survivorship than branch order and soil depth. However, the effects
of season varied with species and were stronger in temperate forests, whereas the influence of diameter and order were relatively
consistent across species. These results suggest that root structures such as diameter and branch order should be carefully
considered in root classification and sampling, and adding season of birth (particularly in temperate forests) as a covariate
in root survivorship analysis should further enhance our ability in achieving a better understanding of root demography and
more accurate estimates of root turnover in forests of different climate zones. |
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