Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation
Kou, L; Chen, WW; Gao, WL; Yang, H; Wang, HM; Li, SG
2015
Source PublicationBIOLOGY AND FERTILITY OF SOILS
ISSN0178-2762
Volume51Issue:8Pages:947-957
AbstractNon-additive effects may occur when branching order-based fine roots decompose in mixture, due to their distinct chemical composition. However, these effects and how they respond to increased nitrogen (N) availability are poorly known. We conducted a 524-day field litterbag experiment to examine the potential non-additive effects of order-based fine root decomposition and their responses to different rates of N addition in a Pinus elliottii (slash pine) plantation in China. The intact fine roots of slash pine trees were hierarchically dissected and split into two groups (lower-order roots (the first and second order roots) and higher-order roots (the third to fifth order roots)). The decomposition of these two root groups was monitored either separately or in 1:1 mixture. The non-additive effects did not occur when the two root groups decomposed in mixture. However, high rate of N addition shifted the root group interactions from additive to synergistic effects through contrasting effects on individual root group (lower-order roots). High rate of N addition retarded the decomposition of lower-order roots more in isolation than in mixture, due to the decreased binding of acid-unhydrolyzable residue to inorganic N ions in mixture. Therefore, we suggest that although stoichiometric heterogeneity holds within the branching hierarchy of fine roots, the tight coupling of N with acid-unhydrolyzable residue of root tissues may limit N use by microdecomposers, and thereby causing the additive effect. Since the mixing effect of order-based root decomposition is affected by N addition, understanding the chemical heterogeneity within fine root systems and their linkage with ambient N availability during decomposition either in isolation or in mixture may facilitate the accurate prediction of root decomposition responses to N loading.
SubtypeJournal
KeywordDecomposition Root branching order Mixing effect Acid-unhydrolyzable residue Nitrogen addition
Subject AreaAgriculture
WOS Subject ExtendedSoil Science
WOS KeywordLITTER DECOMPOSITION ; LEAF-LITTER ; CHINESE TEMPERATE ; FOREST LITTER ; DIVERSITY ; SOIL ; ECOSYSTEM ; ARCHITECTURE ; HETEROGENEITY ; AVAILABILITY
Indexed BySCI
Language英语
WOS IDWOS:000363260300005
PublisherSPRINGER
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44342
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Kou, L,Chen, WW,Gao, WL,et al. Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation[J]. BIOLOGY AND FERTILITY OF SOILS,2015,51(8):947-957.
APA Kou, L,Chen, WW,Gao, WL,Yang, H,Wang, HM,&Li, SG.(2015).Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation.BIOLOGY AND FERTILITY OF SOILS,51(8),947-957.
MLA Kou, L,et al."Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation".BIOLOGY AND FERTILITY OF SOILS 51.8(2015):947-957.
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