DOI: 10.1111/gcb.13514
论文题名: Patterns of structural and defense investments in fine roots of Scots pine (Pinus sylvestris L.) across a strong temperature and latitudinal gradient in Europe
作者: Zadworny M. ; McCormack M.L. ; Żytkowiak R. ; Karolewski P. ; Mucha J. ; Oleksyn J.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 3 起始页码: 1218
结束页码: 1231
语种: 英语
英文关键词: defense
; root order
; root structure
; Scots pine
; temperature gradient
Scopus关键词: Pinus sylvestris
英文摘要: Plant functional traits may be altered as plants adapt to various environmental constraints. Cold, low fertility growing conditions are often associated with root adjustments to increase acquisition of limiting nutrient resources, but they may also result in construction of roots with reduced uptake potential but higher tissue persistence. It is ultimately unclear whether plants produce fine roots of different structure in response to decreasing temperatures and whether these changes represent a trade-off between root function or potential root persistence. We assessed patterns of root construction based on various root morphological, biochemical and defense traits including root diameter, specific root length (SRL), root tissue density (RTD), C:N ratio, phenolic compounds, and number of phellem layers across up to 10 root orders in diverse populations of Scots pine along a 2000-km climatic gradient in Europe. Our results showed that different root traits are related to mean annual temperature (MAT) and expressed a pattern of higher root diameter and lower SRL and RTD in northern sites with lower MAT. Among absorptive roots, we observed a gradual decline in chemical defenses (phenolic compounds) with decreasing MAT. In contrast, decreasing MAT resulted in an increase of structural protection (number of phellem layers) in transport fine roots. This indicated that absorptive roots with high capacity for nutrient uptake, and transport roots with low uptake capacity, were characterized by distinct and contrasting trade-offs. Our observations suggest that diminishing structural and chemical investments into the more distal, absorptive roots in colder climates is consistent with building roots of higher absorptive capacity. At the same time, roots that play a more prominent role in transport of nutrients and water within the root system saw an increase in structural investment, which can increase persistence and reduce long-term costs associated with their frequent replacement. © 2016 John Wiley & Sons Ltd 资助项目: Zadworny, M.
; Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, Poland
; 电子邮件: zadworny@man.poznan.pl
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61033
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, Kórnik, Poland; Department of Plant Biology, University of Minnesota, St. Paul, MN, United States; Department of Forest Resources, University of Minnesota, St. Paul, MN, United States
Recommended Citation:
Zadworny M.,McCormack M.L.,Żytkowiak R.,et al. Patterns of structural and defense investments in fine roots of Scots pine (Pinus sylvestris L.) across a strong temperature and latitudinal gradient in Europe[J]. Global Change Biology,2017-01-01,23(3)