Insights into root growth, function, and mycorrhizal abundance from   chemical and isotopic data across root orders

doi:10.1007/s11104-012-1464-4

CORC > 北京大学 > 城市与环境学院

	Insights into root growth, function, and mycorrhizal abundance from chemical and isotopic data across root orders
	Ouimette, Andrew ; Guo, Dali ; Hobbie, Erik ; Gu, Jiacun
刊名	植物和土壤
	2013
关键词	Carbon Isotope Mycorrhizal fungi Nitrogen Root order N-15 NATURAL-ABUNDANCE LONGLEAF PINE FOREST BELOW-GROUND CARBON BRANCH ORDER NITROGEN AVAILABILITY FRAXINUS-MANDSHURICA FINE ROOTS NUTRIENT AVAILABILITY ECTOMYCORRHIZAL FUNGI STABLE-ISOTOPES
DOI	10.1007/s11104-012-1464-4
英文摘要	Detailed analyses of root chemistry by branching order may provide insights into root function, root lifespan and the abundance of root-associated mycorrhizal fungi in forest ecosystems. We examined the nitrogen and carbon stable isotopes (delta N-15 and delta C-13) and concentration (%N and %C) in the fine roots of an arbuscular mycorrhizal tree, Fraxinus mandshurica, and an ectomycorrhizal tree, Larix gmelinii, over depth, time, and across five root branching orders. Larix delta N-15 increased by 2.3 aEuro degrees from 4th order to 1st order roots, reflecting the increased presence of N-15-enriched ECM fungi on the lower root orders. In contrast, arbuscular mycorrhizal Fraxinus only increased by 0.7 aEuro degrees from 4th order to 1st order roots, reflecting the smaller N-15 enrichment and lower fungal mass on arbuscular mycorrhizal fine roots. Isotopic and anatomical mass balance calculations indicate that first, second, and third order roots in ectomycorrhizal Larix averaged 36 %, 23 %, and 8 % fungal tissue by mass, respectively. Using literature values of root production by root branching order, we estimate that about 25 % of fine root production in ECM species like Larix is actually of fungal sheaths. In contrast to %N, %C, and delta N-15, delta C-13 changed minimally across depth, time, and branching order. The homogeneity of delta C-13 suggests root tissues are constructed from a large well-mixed reservoir of carbon, although compound specific delta C-13 data is needed to fully interpret these patterns. The measurements developed here are an important step towards explicitly including mycorrhizal production in forest ecosystem carbon budgets.; Agronomy; Plant Sciences; Soil Science; SCI(E); 1; ARTICLE; 1-2; 313-326; 367
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/223088]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Ouimette, Andrew,Guo, Dali,Hobbie, Erik,et al. Insights into root growth, function, and mycorrhizal abundance from chemical and isotopic data across root orders[J]. 植物和土壤,2013.
APA	Ouimette, Andrew,Guo, Dali,Hobbie, Erik,&Gu, Jiacun.(2013).Insights into root growth, function, and mycorrhizal abundance from chemical and isotopic data across root orders.植物和土壤.
MLA	Ouimette, Andrew,et al."Insights into root growth, function, and mycorrhizal abundance from chemical and isotopic data across root orders".植物和土壤 (2013).