Details
| Original language | English |
|---|---|
| Pages (from-to) | 200-213 |
| Number of pages | 14 |
| Journal | Geoderma |
| Volume | 333 |
| Early online date | 26 Jul 2018 |
| Publication status | Published - 1 Jan 2019 |
Abstract
Understanding of the fate of phytolith in soils is important because of its role as an agronomical nutrient resource and for carbon sequestration. Accumulation of phytolith derived silica occurs in paddy soils when phytolith input, here through straw incorporation, is higher than silica removal through crop offtake, dissolution and leaching. Phytolith dissolution is thought to be the main reason for diminishing of phytolith derived silica in soil, with this dissolution being highly dependent on soil chemical properties. In this study, phytolith content from 78 paddy soils sampled in the Red River (RRD) and Mekong River (MRD) Deltas, Vietnam, were quantified and related to pH, electrical conductivity (EC), oxalate-extractable Al and Fe (Alox and Feox), organic carbon (OC) and clay content. Average phytolith contents within the topsoil (0–20 cm) were 4.8 ± 1.98 and 7.74 ± 2.97 mg g−1 for the RRD and MRD, respectively. Positive correlation coefficients obtained for Alox, OC, clay content and EC, implying that these parameters might enhance phytolith resistance to dissolution. Soil pH had a negative correlation coefficient with phytolith content. Lower pH and higher Alox content explained the predominance of the phytolith in the MRD compared to the RRD. Soil pH adjustment can be proposed as an active management strategy to maintain phytolith added Si, source for crops and for carbon sequestration.
Keywords
- Correlations, Mekong River Delta, Paddy soil, Phytolith content, Red River Delta, Soil properties
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Geoderma, Vol. 333, 01.01.2019, p. 200-213.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phytolith content in Vietnamese paddy soils in relation to soil properties
AU - Nguyen, Minh N.
AU - Dultz, Stefan
AU - Meharg, Andrew
AU - Pham, Quang V.
AU - Hoang, Anh N.
AU - Dam, Than T.N.
AU - Nguyen, Van Thanh A.
AU - Nguyen, Khai M.
AU - Nguyen, Huan X.
AU - Nguyen, Nghia T.
N1 - Funding Information: This research is funded by the Vietnam National University, Hanoi (VNU) under project number QG.17.22. We would like to thank Dr. Trinh Thanh Trung, Institute of Microbiology & Biotechnology, VNU for his support in collecting samples in the Mekong River Delta. We thank the editor and anonymous reviewers for their helpful comments, which allowed us to improve the manuscript.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Understanding of the fate of phytolith in soils is important because of its role as an agronomical nutrient resource and for carbon sequestration. Accumulation of phytolith derived silica occurs in paddy soils when phytolith input, here through straw incorporation, is higher than silica removal through crop offtake, dissolution and leaching. Phytolith dissolution is thought to be the main reason for diminishing of phytolith derived silica in soil, with this dissolution being highly dependent on soil chemical properties. In this study, phytolith content from 78 paddy soils sampled in the Red River (RRD) and Mekong River (MRD) Deltas, Vietnam, were quantified and related to pH, electrical conductivity (EC), oxalate-extractable Al and Fe (Alox and Feox), organic carbon (OC) and clay content. Average phytolith contents within the topsoil (0–20 cm) were 4.8 ± 1.98 and 7.74 ± 2.97 mg g−1 for the RRD and MRD, respectively. Positive correlation coefficients obtained for Alox, OC, clay content and EC, implying that these parameters might enhance phytolith resistance to dissolution. Soil pH had a negative correlation coefficient with phytolith content. Lower pH and higher Alox content explained the predominance of the phytolith in the MRD compared to the RRD. Soil pH adjustment can be proposed as an active management strategy to maintain phytolith added Si, source for crops and for carbon sequestration.
AB - Understanding of the fate of phytolith in soils is important because of its role as an agronomical nutrient resource and for carbon sequestration. Accumulation of phytolith derived silica occurs in paddy soils when phytolith input, here through straw incorporation, is higher than silica removal through crop offtake, dissolution and leaching. Phytolith dissolution is thought to be the main reason for diminishing of phytolith derived silica in soil, with this dissolution being highly dependent on soil chemical properties. In this study, phytolith content from 78 paddy soils sampled in the Red River (RRD) and Mekong River (MRD) Deltas, Vietnam, were quantified and related to pH, electrical conductivity (EC), oxalate-extractable Al and Fe (Alox and Feox), organic carbon (OC) and clay content. Average phytolith contents within the topsoil (0–20 cm) were 4.8 ± 1.98 and 7.74 ± 2.97 mg g−1 for the RRD and MRD, respectively. Positive correlation coefficients obtained for Alox, OC, clay content and EC, implying that these parameters might enhance phytolith resistance to dissolution. Soil pH had a negative correlation coefficient with phytolith content. Lower pH and higher Alox content explained the predominance of the phytolith in the MRD compared to the RRD. Soil pH adjustment can be proposed as an active management strategy to maintain phytolith added Si, source for crops and for carbon sequestration.
KW - Correlations
KW - Mekong River Delta
KW - Paddy soil
KW - Phytolith content
KW - Red River Delta
KW - Soil properties
UR - http://www.scopus.com/inward/record.url?scp=85050504600&partnerID=8YFLogxK
U2 - 10.1016/j.geoderma.2018.07.027
DO - 10.1016/j.geoderma.2018.07.027
M3 - Article
AN - SCOPUS:85050504600
VL - 333
SP - 200
EP - 213
JO - Geoderma
JF - Geoderma
SN - 0016-7061
ER -