Threshold responses of soil organic carbon concentration and composition to multi-level nitrogen addition in a temperate needle-broadleaved forest
Cheng, SL; Fang, HJ; Yu, GR
2018
Source PublicationBIOGEOCHEMISTRY
ISSN0168-2563
Volume137Issue:1-2Pages:219-233
AbstractResponses of soil organic carbon (SOC) cycling and C budget in forest ecosystems to elevated nitrogen (N) deposition are divergent. Little is known about the N critical loads for the shift between gain and loss of SOC storage in the old-growth temperate forest of Northeast China. The objective of this study was to investigate the nonlinear responses of SOC concentration and composition to multiple rates of N addition, as well as the microbial mechanisms responsible for SOC alteration under N enrichment. Nine rates of urea addition (0, 10, 20, 40, 60, 80, 100, 120, 140 kg N ha(-1) year(-1)) with 4 replicates for each treatment were conducted. Soil samples in the 0-10 cm mineral layer were taken after 3 years of N fertilization. Soil aggregate size distribution and SOC physical fractionation were performed to examine SOC dynamics. Phospholipid fatty acid (PLFA) technique was used to measure the abundance and structure of microbial community. Three years of N addition led to significant increases in the concentrations of soil particulate organic C and aggregate-associated organic C fractions only. The responses of total N and each labile SOC fraction to the rates of N addition followed Gaussian equations, with the N critical loads being estimated to be between 80 and 100 kg N ha(-1) year(-1). The change in SOC concentration (Delta SOC) was positively correlated with the changes in aggregate associated OC (r(2) > 0.80) and POC concentrations (r(2) > 0.50). Significant correlations among the concentrations of labile SOC fractions, the percentages of soil aggregates, and the abundances of microbial PLFAs were observed, which implies a close linkage between microbial community structure and SOC accumulation and stability. Our results suggest that increase in soil moisture and shift of microbial community structure could control the critical N load for the switch between C accumulation and loss. The current N deposition rate (similar to 11 kg N ha(-1) year(-1)) to the northeast China's forests is favorable for soil C accumulation over the short term.
SubtypeJournal
KeywordAtmospheric N deposition SOC physical fractionation Aggregate size distribution Microbial community abundance Nonlinear responses
Subject AreaEnvironmental Sciences & Ecology ; Geology
WOS Subject ExtendedEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS KeywordMICROBIAL COMMUNITY STRUCTURE ; NORTHERN HARDWOOD FORESTS ; TERRESTRIAL ECOSYSTEMS ; N-DEPOSITION ; LITTER DECOMPOSITION ; NONLINEAR RESPONSES ; TROPICAL FOREST ; BOREAL FORESTS ; MIXED FOREST ; MATTER
Indexed BySCI
Language英语
WOS IDWOS:000423362600013
PublisherSPRINGER
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43942
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
Cheng, SL,Fang, HJ,Yu, GR. Threshold responses of soil organic carbon concentration and composition to multi-level nitrogen addition in a temperate needle-broadleaved forest[J]. BIOGEOCHEMISTRY,2018,137(1-2):219-233.
APA Cheng, SL,Fang, HJ,&Yu, GR.(2018).Threshold responses of soil organic carbon concentration and composition to multi-level nitrogen addition in a temperate needle-broadleaved forest.BIOGEOCHEMISTRY,137(1-2),219-233.
MLA Cheng, SL,et al."Threshold responses of soil organic carbon concentration and composition to multi-level nitrogen addition in a temperate needle-broadleaved forest".BIOGEOCHEMISTRY 137.1-2(2018):219-233.
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