Nitrogen fertilization increases rhizodeposit incorporation into microbial biomass and reduces soil organic matter losses
Zang, HD; Blagodatskaya, E; Wang, JY; Xu, XL; Kuzyakov, Y
2017
Source PublicationBIOLOGY AND FERTILITY OF SOILS
ISSN0178-2762
Volume53Issue:4Pages:419-429
AbstractAgricultural soils receive large amounts of anthropogenic nitrogen (N), which directly and indirectly affect soil organic matter (SOM) stocks and CO2 fluxes. However, our current understanding of mechanisms on how N fertilization affects SOM pools of various ages and turnover remains poor. The delta C-13 values of SOM after wheat (C-3)-maize (C-4) vegetation change were used to calculate the contribution of C-4-derived rhizodeposited C (rhizo-C) and C-3-derived SOM pools, i.e., rhizo-C and SOM. Soil (Ap from Haplic Luvisol) sampled from maize rhizosphere was incubated over 56 days with increasing N fertilization (four levels up to 300 kg N ha(-1)), and CO2 efflux and its delta C-13 were measured. Nitrogen fertilization decreased CO2 efflux by 27-42% as compared to unfertilized soil. This CO2 decrease was mainly caused by the retardation of SOM (C-3) mineralization. Microbial availability of rhizo-C (released by maize roots within 4 weeks) was about 10 times higher than that of SOM (older than 4 weeks). Microbial biomass and dissolved organic C remained at the same level with increasing N. However, N fertilization increased the relative contribution of rhizo-C to microbial biomass by two to five times and to CO2 for about two times. This increased contribution of rhizo-C reflects strongly accelerated microbial biomass turnover by N addition. The decomposition rate of rhizo-C was 3.7 times faster than that of SOM, and it increased additionally by 6.5 times under 300 kg N ha(-1) N fertilization. This is the first report estimating the turnover and incorporation of very recent rhizo-C (4 weeks old) into soil C pools and shows that the turnover of rhizo-C was much faster than that of SOM. We conclude that the contribution of rhizo-C to CO2 and to microbial biomass is highly dependent on N fertilization. Despite acceleration of rhizo-C turnover, the increased N fertilization facilitates C sequestration by decreasing SOM decomposition.
SubtypeJournal
KeywordCO2 partitioning C-3-C-4 vegetation change Microbial biomass SOM decomposition Nutrient availability
Subject AreaAgriculture
WOS Subject ExtendedSoil Science
WOS KeywordC-13 NATURAL-ABUNDANCE ; FAGUS-SYLVATICA L. ; FUMIGATION-EXTRACTION ; METABOLIC QUOTIENT ; ISOTOPE ANALYSES ; ELEVATED CO2 ; CARBON POOLS ; DECOMPOSITION ; RESPIRATION ; ROOT
Indexed BySCI
Language英语
WOS IDWOS:000400351800006
PublisherSPRINGER
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44067
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
Zang, HD,Blagodatskaya, E,Wang, JY,et al. Nitrogen fertilization increases rhizodeposit incorporation into microbial biomass and reduces soil organic matter losses[J]. BIOLOGY AND FERTILITY OF SOILS,2017,53(4):419-429.
APA Zang, HD,Blagodatskaya, E,Wang, JY,Xu, XL,&Kuzyakov, Y.(2017).Nitrogen fertilization increases rhizodeposit incorporation into microbial biomass and reduces soil organic matter losses.BIOLOGY AND FERTILITY OF SOILS,53(4),419-429.
MLA Zang, HD,et al."Nitrogen fertilization increases rhizodeposit incorporation into microbial biomass and reduces soil organic matter losses".BIOLOGY AND FERTILITY OF SOILS 53.4(2017):419-429.
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