Nitrogen dynamics differed among the first six root branch orders of   Fraxinus mandshurica and Larix gmelinii during short-term decomposition

doi:10.1007/s10265-009-0303-z

CORC > 北京大学 > 城市与环境学院

	Nitrogen dynamics differed among the first six root branch orders of Fraxinus mandshurica and Larix gmelinii during short-term decomposition
	Fan, Pingping ; Jiang, Youxu
刊名	journal of plant research
	2010
关键词	C/N Decomposition Fine roots Mycorrhizal Order delta(15)N MYCORRHIZAL COLONIZATION LITTER DECOMPOSITION NATURAL-ABUNDANCE FOREST PATTERNS MINERALIZATION QUALITY CARBON FUNGI
DOI	10.1007/s10265-009-0303-z
英文摘要	Fine root (< 2 mm) decomposition provides a substantial amount of available nitrogen (N) that sustains plant growth. The N release pattern during litter decomposition is generally controlled by initial N concentrations or C/N. Because root branch order and mycorrhizal colonization (related with branch order) are both highly related with different initial chemistry, a hypothesis was proposed that N dynamics during root decomposition varied among different branch orders. Using the litterbag method, decomposition of the first six order roots for Fraxinus mandshurica (an arbuscular mycorrhizal species) and Larix gmelinii (an ectomycorrhizal species) was studied in Northeast China during a 513-day period. Results showed a similar pattern for the two species with contrasting mycorrhizal type: lower-order roots (the lateral root tips), which had an initial C/N of 17-21, continuously released N without any immobilization and maintained a consistently low C/N (< 20), whereas higher-order roots, which had an initial C/N of 28-48, periodically immobilized N, leading to a declining C/N over time. In addition, the magnitude of N dynamics is different between species for lower-order roots, but no different for higher-order roots. These results suggest that fine root N dynamics are heterogeneous among branch orders and that species-specific differences depend on the behavior of lower-order roots.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000278939900006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Plant Sciences; SCI(E); PubMed; 6; ARTICLE; 4; 433-438; 123
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/160722]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Fan, Pingping,Jiang, Youxu. Nitrogen dynamics differed among the first six root branch orders of Fraxinus mandshurica and Larix gmelinii during short-term decomposition[J]. journal of plant research,2010.
APA	Fan, Pingping,&Jiang, Youxu.(2010).Nitrogen dynamics differed among the first six root branch orders of Fraxinus mandshurica and Larix gmelinii during short-term decomposition.journal of plant research.
MLA	Fan, Pingping,et al."Nitrogen dynamics differed among the first six root branch orders of Fraxinus mandshurica and Larix gmelinii during short-term decomposition".journal of plant research (2010).