Early season root production in relation to leaf production among six diverse temperate tree species

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• 作者：M. Luke McCormack (1) (2)
  Katie P. Gaines (2) (3)
  Melissa Pastore (3) (4)
  David M. Eissenstat (2) (3)
  
  1. Key Laboratory of Ecosystem Network Observation and Modeling ; Institute of Geographic Sciences and Natural Resources Research ; Chinese Academy of Sciences ; 11A Datun Road ; Chaoyang District ; Beijing ; 100101 ; China
  2. Intercollege Graduate Degree Program in Ecology ; The Pennsylvania State University ; State College ; PA ; 16801 ; USA
  3. Department of Ecosystem Science and Management ; The Pennsylvania State University ; State College ; PA ; 16801 ; USA
  4. Department of Biology ; Villanova University ; Villanova ; PA ; 19085 ; USA
  
• 关键词：Phenology ; Ecosystem ; Net primary production (NPP) ; Minirhizotron ; Belowground ; Leaf area index (LAI)
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：389
• 期：1-2
• 页码：121-129
• 全文大小：562 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Aims Leaf and root phenology play important roles controlling plant productivity and ecosystem function, yet, few studies link patterns of leaf and root phenology across woody species. Trees with diffuse-porous wood anatomy tend to leaf-out before ring-porous species and we expected that increases in transpiration with spring leaf-out would be coupled with initiation of root production to support uptake of soil resources. Therefore, we hypothesized that the timing of root production would follow patterns of leaf production and wood anatomy. Methods Root production was observed using minirhizotrons and related to leaf phenology across six temperate tree species with different wood anatomy in a common garden. Results As expected, leaves of diffuse-porous species emerged before ring-porous, followed by tracheid species. Root production peaked before bud break in five of the six species and before maximum leaf area index in all species, but did not follow expected patterns with leaf production. Conclusions Our observations did not indicate tight linkages between root and leaf phenology but do highlight the potential for very early season root production and greater variation in the phenology of roots than leaves. Future work should identify the environmental factors and species traits that best explain variation in root phenology.