DOI: 10.1016/j.scitotenv.2019.136070
论文题名: Water extractable organic matter and iron in relation to land use and seasonal changes
作者: Praise S. ; Ito H. ; Sakuraba T. ; Pham D.V. ; Watanabe T.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 707 语种: 英语
英文关键词: Iron
; Land use
; Parallel factor analysis (PARAFAC)
; Seasonality
; Water extractable organic matter
Scopus关键词: Amino acids
; Aquatic ecosystems
; Biogeochemistry
; Forestry
; Iron
; Organic carbon
; Organic minerals
; Rate constants
; Soils
; Global carbon cycle
; Local environments
; Parallel factor analysis
; Relative abundance
; Seasonality
; Spectral characteristics
; Water extractable organic carbon
; Water extractable organic matter
; Land use
; dissolved organic matter
; iron
; organic carbon
; rain
; soil organic matter
; arable land
; extraction method
; factor analysis
; forest soil
; iron
; land use change
; organic matter
; oxidation
; rainwater
; seasonality
; trend analysis
; arable land
; Article
; forest soil
; humic substance
; Japan
; land use
; priority journal
; seasonal variation
; soil depth
; vegetation
英文摘要: The soil carbon pool is an essential part of the global carbon cycle although it is sensitive to climatic changes and the local environment. Terrestrial areas are important sources of organic matter for aquatic ecosystems and the fluctuation of different soil minerals and elements is largely influenced by land use and season changes. We studied water-extractable organic matter (WEOM) properties including iron (Fe), water extractable organic carbon (WEOC) and spectral characteristics from forests and arable soils to evaluate the effects of land use and seasonal change on WEOM and Fe in terrestrial areas. We collected soil samples randomly from arable land (AR), broadleaf (BL) and aged needle leaf forests (NL) and extracted WEOM for analysis using rainwater. Results of WEOC and Fe showed similar trend seasonally and were higher in forest sample than in AR. WEOC was high in the upper layer while Fe was independent of the depth and higher in AR. On the other hand, specific ultra-violet absorbance at 254 nm (SUVA254) and a proxy for aromaticity significantly varied with both land use and season and was on average two times higher in arable land than forests during spring and summer. Humic-like components significantly varied between the studied sites seasonally while tyrosine-like was affected by season only. The relative abundance of both humic-like and tryptophan-like components were significantly affected by land use while [Fe]: [WEOC] ratio was also high in arable land and negatively correlated with humic-like components in forest sites. As observed from ratio and Fe oxidation rate constant, summer presented ideal conditions for WEOM interactions. The synchronized seasonal WEOC and Fe changes indicate an enhancement of Fe mobility by DOM whereas the differences observed between sites especially from the high humic- and protein-like components in NL and BL reflects the effect of land use. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158724
Appears in Collections: 气候变化与战略
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作者单位: Department of Food, Life and Environmental Sciences, Yamagata University, 1-23 Wakaba-machi, Tsuruoka, Yamagata 997-8555, Japan; Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
Recommended Citation:
Praise S.,Ito H.,Sakuraba T.,et al. Water extractable organic matter and iron in relation to land use and seasonal changes[J]. Science of the Total Environment,2020-01-01,707