Details
| Original language | English |
|---|---|
| Pages (from-to) | 153-167 |
| Number of pages | 15 |
| Journal | Plant and soil |
| Volume | 445 |
| Issue number | 1-2 |
| Publication status | Published - 10 Dec 2018 |
Abstract
Background and aims: Water and nutrient management influences the allocation and stabilisation of newly assimilated carbon (C) in paddy soils. This study aimed to determine the belowground allocation of C assimilated by rice and the subsequent C stabilisation in soil aggregates and as mineral-organic associates depending on combined alternate wetting and drying (AWD) versus continuous flooding (CF) and P fertilisation. Methods: We continuously labelled rice plants in 13CO2 atmosphere under AWD versus CF water management, and at two P fertilisation levels (0 or 80 mg P kg−1 soil). The 13C allocation to soil and its incorporation into the wet-sieved aggregate size classes and density fractions of the rhizosphere and bulk soils were analysed 6, 14, and 22 days after the labelling was started (D6, D14, and D22, respectively). Results: Under both water regimes and P fertilisation levels, the proportion of photoassimilates was the highest in the silt- and clay-size aggregate classes and in the mineral-associated fraction. On D6 and D14, P fertilization resulted in smaller 13C incorporation into soil, independent of water management. In the rhizosphere soil, at D22, P fertilisation increased 13C incorporation over no P amendment in macroaggregates (>250 μm) by 32% (AWD) and 42% (CF), in microaggregates (250–53 μm) by 97% (CF), and in the silt + clay size class (<53 μm) by 83% (CF). Further, P fertilisation led to larger 13C incorporation into the rhizosphere soil light fraction (75% at AWD and 90% at CF) and dense fraction (38% and 45%, respectively), and into the bulk soil macroaggregates (71% and 78%, respectively). Conclusions: Phosphorus fertilisation increased the contents of recent photoassimilates in soil aggregate classes with longer residence time as well as of the particulate organic matter with the continuation of plant growth. This positive response of the stabilisation of recent plant photosynthates in soil to P fertilisation can increase the potential of paddy soil for C sequestration. This potential is not limited by the introduction of alternate wetting and drying water-saving technique.
Keywords
- Carbon sequestration, Carbon stabilisation, Paddy soil, Rhizodeposition, Soil aggregate size classes, Soil density fractions
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Plant and soil, Vol. 445, No. 1-2, 10.12.2018, p. 153-167.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Assimilate allocation by rice and carbon stabilisation in soil: effect of water management and phosphorus fertilisation
AU - Atere, Cornelius Talade
AU - Ge, Tida
AU - Zhu, Zhenke
AU - Liu, Shoulong
AU - Huang, Xizhi
AU - Shibsitova, Olga
AU - Guggenberger, Georg
AU - Wu, Jinshui
N1 - Funding information: This study was financially supported by the National key research and development program (2016YFE0101100), the Australia-China Joint Research Centre – Healthy Soils for Sustainable Food Production and Environmental Quality (ACSRF48165); the National Natural Science Foundation of China (41671292; 41522107); the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB15020401); the Youth Innovation Team Project of ISA, CAS (2017QNCXTD_GTD); the Chinese Academy of Sciences President’s International Fellowship Initiative to Georg Guggenberger (2018VCA0031); and Public Service Technology Centre, Institute of Subtropical Agriculture, Chinese Academy of Sciences. Dr. Cornelius T. Atere acknowledges the PhD training grant from the Nigerian Tertiary Education Trust Fund through the Obafemi Awolowo University, Ile-Ife, Nigeria.
PY - 2018/12/10
Y1 - 2018/12/10
N2 - Background and aims: Water and nutrient management influences the allocation and stabilisation of newly assimilated carbon (C) in paddy soils. This study aimed to determine the belowground allocation of C assimilated by rice and the subsequent C stabilisation in soil aggregates and as mineral-organic associates depending on combined alternate wetting and drying (AWD) versus continuous flooding (CF) and P fertilisation. Methods: We continuously labelled rice plants in 13CO2 atmosphere under AWD versus CF water management, and at two P fertilisation levels (0 or 80 mg P kg−1 soil). The 13C allocation to soil and its incorporation into the wet-sieved aggregate size classes and density fractions of the rhizosphere and bulk soils were analysed 6, 14, and 22 days after the labelling was started (D6, D14, and D22, respectively). Results: Under both water regimes and P fertilisation levels, the proportion of photoassimilates was the highest in the silt- and clay-size aggregate classes and in the mineral-associated fraction. On D6 and D14, P fertilization resulted in smaller 13C incorporation into soil, independent of water management. In the rhizosphere soil, at D22, P fertilisation increased 13C incorporation over no P amendment in macroaggregates (>250 μm) by 32% (AWD) and 42% (CF), in microaggregates (250–53 μm) by 97% (CF), and in the silt + clay size class (<53 μm) by 83% (CF). Further, P fertilisation led to larger 13C incorporation into the rhizosphere soil light fraction (75% at AWD and 90% at CF) and dense fraction (38% and 45%, respectively), and into the bulk soil macroaggregates (71% and 78%, respectively). Conclusions: Phosphorus fertilisation increased the contents of recent photoassimilates in soil aggregate classes with longer residence time as well as of the particulate organic matter with the continuation of plant growth. This positive response of the stabilisation of recent plant photosynthates in soil to P fertilisation can increase the potential of paddy soil for C sequestration. This potential is not limited by the introduction of alternate wetting and drying water-saving technique.
AB - Background and aims: Water and nutrient management influences the allocation and stabilisation of newly assimilated carbon (C) in paddy soils. This study aimed to determine the belowground allocation of C assimilated by rice and the subsequent C stabilisation in soil aggregates and as mineral-organic associates depending on combined alternate wetting and drying (AWD) versus continuous flooding (CF) and P fertilisation. Methods: We continuously labelled rice plants in 13CO2 atmosphere under AWD versus CF water management, and at two P fertilisation levels (0 or 80 mg P kg−1 soil). The 13C allocation to soil and its incorporation into the wet-sieved aggregate size classes and density fractions of the rhizosphere and bulk soils were analysed 6, 14, and 22 days after the labelling was started (D6, D14, and D22, respectively). Results: Under both water regimes and P fertilisation levels, the proportion of photoassimilates was the highest in the silt- and clay-size aggregate classes and in the mineral-associated fraction. On D6 and D14, P fertilization resulted in smaller 13C incorporation into soil, independent of water management. In the rhizosphere soil, at D22, P fertilisation increased 13C incorporation over no P amendment in macroaggregates (>250 μm) by 32% (AWD) and 42% (CF), in microaggregates (250–53 μm) by 97% (CF), and in the silt + clay size class (<53 μm) by 83% (CF). Further, P fertilisation led to larger 13C incorporation into the rhizosphere soil light fraction (75% at AWD and 90% at CF) and dense fraction (38% and 45%, respectively), and into the bulk soil macroaggregates (71% and 78%, respectively). Conclusions: Phosphorus fertilisation increased the contents of recent photoassimilates in soil aggregate classes with longer residence time as well as of the particulate organic matter with the continuation of plant growth. This positive response of the stabilisation of recent plant photosynthates in soil to P fertilisation can increase the potential of paddy soil for C sequestration. This potential is not limited by the introduction of alternate wetting and drying water-saving technique.
KW - Carbon sequestration
KW - Carbon stabilisation
KW - Paddy soil
KW - Rhizodeposition
KW - Soil aggregate size classes
KW - Soil density fractions
UR - http://www.scopus.com/inward/record.url?scp=85058079484&partnerID=8YFLogxK
U2 - 10.1007/s11104-018-03905-x
DO - 10.1007/s11104-018-03905-x
M3 - Article
AN - SCOPUS:85058079484
VL - 445
SP - 153
EP - 167
JO - Plant and soil
JF - Plant and soil
SN - 0032-079X
IS - 1-2
ER -