Effects of application of microbial fertilizer on aggregation and aggregate-associated carbon in saline soils
Cong, PF; Ouyang, Z; Hou, RX; Han, DR
2017
Source PublicationSOIL & TILLAGE RESEARCH
ISSN0167-1987
Volume168Pages:33-41
AbstractA pot experiment was conducted to elucidate the process of aggregate formation and the accumulation of soil organic C as affected by application of microbial fertilizer in coastal saline soils east of Shandong Province, China. The study was designed with five levels of electrical conductivity (EC): 0.33, 0.62, 1.13, 1.45 and 2.04 ds m(-1). For each EC level, a treatment group received microbial fertilizer (MF) and a control (CK) did not. The mass and organic C concentration of aggregates (>2000 mu m large macroaggregate, 25-02000 mu m small macroaggregate and 53-250 mu m microaggregate, <53 mu m silt+clay fraction) were measured. Treatments and controls were denoted as MF1-MF5 and CK1-CK5 from lowest to highest EC values. The soil organic C concentrations of MF1-MF3, but not MF4 and MF5, were significantly higher than that of their controls. For MF1-MF3, application of microbial fertilizer significantly increased the proportion of macroaggregates. MF1-MF3 treatments exhibited significantly increased organic C concentration in the large macro-aggregates and free silt+clay fractions, but the differences were not significant for EC values of 1.45 and 2.04 ds m(-1). The mass proportion of large and small macroaggregates was significantly related with organic C concentration in the microaggregates. For EC values 1.45 and 2.04 ds m(-1), the silt C was too low to form the microaggregates, and the aggregates were not significantly different. Significant linear relationships existed between the organic C concentration in the silt + clay fraction and mass ratio of the macro- to micro-aggregates. We suggested that microbial fertilizer reduced the silt + clay fraction and increased the microaggregate mass by increasing soil organic C in the silt + clay fraction, which promoted the formation of macroaggregates. The mass and organic C of microaggregates played an important role in aggregation and C accumulation. (C) 2016 Elsevier B.V. All rights reserved.
SubtypeJournal
KeywordAggregates Soil organic C Saline soil
Subject AreaAgriculture
WOS Subject ExtendedSoil Science
WOS KeywordORGANIC-MATTER ; GRASSLAND SOILS ; PLANT RESIDUE ; SODIC SOILS ; BACTERIAL ; DECOMPOSITION ; RESPIRATION ; DYNAMICS ; NITROGEN ; WATER
Indexed BySCI
Language英语
WOS IDWOS:000394079800004
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44070
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
Cong, PF,Ouyang, Z,Hou, RX,et al. Effects of application of microbial fertilizer on aggregation and aggregate-associated carbon in saline soils[J]. SOIL & TILLAGE RESEARCH,2017,168:33-41.
APA Cong, PF,Ouyang, Z,Hou, RX,&Han, DR.(2017).Effects of application of microbial fertilizer on aggregation and aggregate-associated carbon in saline soils.SOIL & TILLAGE RESEARCH,168,33-41.
MLA Cong, PF,et al."Effects of application of microbial fertilizer on aggregation and aggregate-associated carbon in saline soils".SOIL & TILLAGE RESEARCH 168(2017):33-41.
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