气候变化领域集成服务门户(CCPortal): Seasonality of fine root dynamics and activity of root and shoot vascular cambium in a Quercus ilex L. forest (Italy)

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DOI	10.1016/j.foreco.2018.06.044
	Seasonality of fine root dynamics and activity of root and shoot vascular cambium in a Quercus ilex L. forest (Italy)
	Montagnoli A.; Dumroese R.K.; Terzaghi M.; Onelli E.; Scippa G.S.; Chiatante D.
发表日期	2019
ISSN	0378-1127
起始页码	26
结束页码	34
卷号	431
英文摘要	We investigated the effects of seasonal changes in soil moisture and temperature on the morphological growth traits of fine roots (<2 mm in diameter) and vascular cambium activity of stems and coarse roots in a mature Quercus ilex L. stand in the South of Italy. Fine roots were sampled by a soil core method, and cambium tissues were carefully collected by hammer and chisel. Mean annual fine root mass and length were 115 g m−2 (live 45 g m−2; dead 70 g m−2) and 471 m m−2 (live 244 m m−2, dead 227 m m−2), respectively. Mean diameter size of fine root necromass was higher than for fine root biomass. Mean specific root length (SRL) was 6.8 m g−1 and turnover rate was 3 year−1. Fine root traits displayed a complex pattern related to season. In particular, biomass and length peaked in summer and late autumn. The summer maximum was characterized by an increase of the thinner part of the root population (smallest diameter size and highest SRL) and was mainly driven by soil temperature. Our results suggest that Q. ilex adopted an intensive strategy modifying the root length per unit mass, channelling carbon preferentially into the production of very fine roots. This allowed trees to exploit transient periods of low soil water content by accessing a greater soil volume and thereby facilitating nutrient and water uptake. The autumn maximum was characterized by an increase in mean diameter size of the fine root population (largest mean diameter size and lowest SRL). Thus, once precipitation sufficiently recharged soil moisture, it is reasonable to state that in addition to trees producing new roots, their percentage of very fine roots that did not die after the summer flush continued their growth in a radial pattern to function for starch storage. Shoot and root cambial activity strongly varied during the season from the winter minimum (4.8 shoot and 4.7 root cambial cell number) to three- and two-fold higher values measured during the summer maximum, and higher values but of lesser magnitude measured in autumn. Periods of cambial activity significantly matched fine root phenology. Matching these growth traits with soil temperature and water content within a natural stand of Q. ilex enables this species to survive the typically dry summer in the Mediterranean area, which is likely to become drier and longer given the increase in temperature expected this century. © 2018 Elsevier B.V.
英文关键词	Cambium; Intensive strategy; Quercus ilex; Soil temperature; Soil water content; Specific root length; Turnover rate
语种	英语
scopus关键词	Ecology; Soil moisture; Temperature; Cambium; Intensive strategy; Quercus ilex; Soil temperature; Soil water content; Specific root length; Turnover rate; Forestry; belowground biomass; fine root; root system; seasonality; shrub; soil temperature; soil water; starch; water content; xylem; Averages; Cambium; Ecology; Forestry; Quercus Ilex; Roots; Temperature; Italy; Quercus ilex
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156415
作者单位	Department of Biotechnology and Life Science, University of Insubria, Varese, Italy; USDA Forest Service, Rocky Mountain Research Station, Moscow, ID 83843, United States; Department of Biosciences, University of Milan, Milan, Italy; Department of Biosciences and Territory, University of Molise, Pesche (IS), Italy
推荐引用方式 GB/T 7714	Montagnoli A.,Dumroese R.K.,Terzaghi M.,et al. Seasonality of fine root dynamics and activity of root and shoot vascular cambium in a Quercus ilex L. forest (Italy)[J],2019,431.
APA	Montagnoli A.,Dumroese R.K.,Terzaghi M.,Onelli E.,Scippa G.S.,&Chiatante D..(2019).Seasonality of fine root dynamics and activity of root and shoot vascular cambium in a Quercus ilex L. forest (Italy).Forest Ecology and Management,431.
MLA	Montagnoli A.,et al."Seasonality of fine root dynamics and activity of root and shoot vascular cambium in a Quercus ilex L. forest (Italy)".Forest Ecology and Management 431(2019).