Details
| Original language | English |
|---|---|
| Pages (from-to) | 30-39 |
| Number of pages | 10 |
| Journal | Geoderma |
| Volume | 338 |
| Early online date | 29 Nov 2018 |
| Publication status | Published - 15 Mar 2019 |
Abstract
Rhizodeposition represents a readily available C and energy source for soil microorganisms, that plays an important role in the regulation of C and nutrient cycling in ecosystems and exerts a strong influence on C sequestration. The dynamics of rice rhizo-C in soils and its allocation to microorganisms during rice growth, as well as the effects of nitrogen (N-NH4 +) fertilization are poorly understood, particularly with respect to the initial uptake of rhizo-C by microorganisms and its utilization during the entire growth period. To assess these two processes, rice plants were grown in pots with or without N fertilization (0 and 225 kg N-NH4 + ha−1), and 13C incorporation into microbial groups was traced by phospholipid fatty acids (PLFAs) analysis within 6 h after 13CO2 pulse labeling. Labeling was performed at five growth stages: tillering, elongation, heading, filling, and maturation. 13C incorporated into soil microbial biomass C changed rapidly at the beginning of the study period, before elongation, but remained stable thereafter. 13C incorporation into rhizosphere and bulk soil microbial biomass was higher with than without N addition. This stimulation was likely due to the excessive increase in phytomass formation and root exudates after N fertilization and the increased assimilate C input into the soil. Structural equation modelling suggested that N fertilization strongly affected carbon transfer between rhizosphere and non-rhizosphere. Hence, N-NH4 + application may not only increase rhizo-C flow into microorganisms but it may also increase the effect of rhizosphere on bulk-soil microorganisms and subsequent processes related to soil C-cycling.
Keywords
- Microbial biomass carbon, Phospholipid fatty acids, Pulse labeling, Rhizodeposition, Rice
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Geoderma, Vol. 338, 15.03.2019, p. 30-39.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Initial utilization of rhizodeposits with rice growth in paddy soils
T2 - Rhizosphere and N fertilization effects
AU - Liu, Yalong
AU - Ge, Tida
AU - Ye, Jun
AU - Liu, Shoulong
AU - Shibistova, Olga
AU - Wang, Ping
AU - Wang, Jingkuan
AU - Li, Yong
AU - Guggenberger, Georg
AU - Kuzyakov, Yakov
AU - Wu, Jinshui
N1 - Funding Information: This study was supported by the National Key Research and Development Program (2017YFD0800104), the National Natural Science Foundation of China (41771337; 41601305; 41807089), China Postdoctoral Science Foundation (2017M612573) and the International Postdoctoral Exchange Fellowship Program 2018, Chinese Academy of Sciences President's International Fellowship Initiative to Georg Guggenberger (2018VCA0031) and Youth Innovation Team Project of ISA, CAS (2017QNCXTD_GTD). We especially thank the Public Service Technology Center, Institute of Subtropical Agriculture, Chinese Academy of Sciences for technical assistance.
PY - 2019/3/15
Y1 - 2019/3/15
N2 - Rhizodeposition represents a readily available C and energy source for soil microorganisms, that plays an important role in the regulation of C and nutrient cycling in ecosystems and exerts a strong influence on C sequestration. The dynamics of rice rhizo-C in soils and its allocation to microorganisms during rice growth, as well as the effects of nitrogen (N-NH4 +) fertilization are poorly understood, particularly with respect to the initial uptake of rhizo-C by microorganisms and its utilization during the entire growth period. To assess these two processes, rice plants were grown in pots with or without N fertilization (0 and 225 kg N-NH4 + ha−1), and 13C incorporation into microbial groups was traced by phospholipid fatty acids (PLFAs) analysis within 6 h after 13CO2 pulse labeling. Labeling was performed at five growth stages: tillering, elongation, heading, filling, and maturation. 13C incorporated into soil microbial biomass C changed rapidly at the beginning of the study period, before elongation, but remained stable thereafter. 13C incorporation into rhizosphere and bulk soil microbial biomass was higher with than without N addition. This stimulation was likely due to the excessive increase in phytomass formation and root exudates after N fertilization and the increased assimilate C input into the soil. Structural equation modelling suggested that N fertilization strongly affected carbon transfer between rhizosphere and non-rhizosphere. Hence, N-NH4 + application may not only increase rhizo-C flow into microorganisms but it may also increase the effect of rhizosphere on bulk-soil microorganisms and subsequent processes related to soil C-cycling.
AB - Rhizodeposition represents a readily available C and energy source for soil microorganisms, that plays an important role in the regulation of C and nutrient cycling in ecosystems and exerts a strong influence on C sequestration. The dynamics of rice rhizo-C in soils and its allocation to microorganisms during rice growth, as well as the effects of nitrogen (N-NH4 +) fertilization are poorly understood, particularly with respect to the initial uptake of rhizo-C by microorganisms and its utilization during the entire growth period. To assess these two processes, rice plants were grown in pots with or without N fertilization (0 and 225 kg N-NH4 + ha−1), and 13C incorporation into microbial groups was traced by phospholipid fatty acids (PLFAs) analysis within 6 h after 13CO2 pulse labeling. Labeling was performed at five growth stages: tillering, elongation, heading, filling, and maturation. 13C incorporated into soil microbial biomass C changed rapidly at the beginning of the study period, before elongation, but remained stable thereafter. 13C incorporation into rhizosphere and bulk soil microbial biomass was higher with than without N addition. This stimulation was likely due to the excessive increase in phytomass formation and root exudates after N fertilization and the increased assimilate C input into the soil. Structural equation modelling suggested that N fertilization strongly affected carbon transfer between rhizosphere and non-rhizosphere. Hence, N-NH4 + application may not only increase rhizo-C flow into microorganisms but it may also increase the effect of rhizosphere on bulk-soil microorganisms and subsequent processes related to soil C-cycling.
KW - Microbial biomass carbon
KW - Phospholipid fatty acids
KW - Pulse labeling
KW - Rhizodeposition
KW - Rice
UR - http://www.scopus.com/inward/record.url?scp=85057300746&partnerID=8YFLogxK
U2 - 10.1016/j.geoderma.2018.11.040
DO - 10.1016/j.geoderma.2018.11.040
M3 - Article
AN - SCOPUS:85057300746
VL - 338
SP - 30
EP - 39
JO - Geoderma
JF - Geoderma
SN - 0016-7061
ER -