Soil organic matter in podzol horizons of the Amazon region: Humification, recalcitrance, and dating

被引：41

作者：

Tadini, Amanda M. ^{[1
,2
,7
]}

Nicolodelli, Gustavo ^{[1
]}

Senesi, Giorgio S. ^{[3
]}

Ishida, Debora A. ^{[4
,5
]}

Montes, Celia R. ^{[5
,6
]}

Lucas, Yves ^{[7
]}

Mounier, Stephane ^{[7
]}

Guimaraes, Francisco E. G. ^{[8
]}

Milori, Debora M. B. P. ^{[1
]}

机构：

[1] Embrapa Instrumentacao, Sao Carlos, SP, Brazil

[2] Univ Sao Paulo, Inst Quim Sao Carlos, Sao Carlos, SP, Brazil

[3] CNR, Inst Nanotechnol NANOTEC, PLasMI Lab, Bari, Italy

[4] Univ Sao Paulo, Inst Energia & Ambiente, Piracicaba, SP, Brazil

[5] Univ Sao Paulo, Nucleo Pesquisa Geoquim & Geofis Litosfera, Piracicaba, SP, Brazil

[6] Univ Sao Paulo, Ctr Energia Nucl Agr, Piracicaba, SP, Brazil

[7] Univ Toulon & Var, Lab PROTEE, CS 60584, F-83041 Toulon 9, France

[8] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP, Brazil

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2018年 / 613卷

基金：

巴西圣保罗研究基金会;

关键词：

Amazon podzols; Organic matter; Humic acids; Humification index; HUMIC SUBSTANCES; FLUORESCENCE SPECTROSCOPY; CARBON STORAGE; ACIDS; BIOGEOCHEMISTRY; OXISOL;

D O I：

10.1016/j.scitotenv.2017.09.068

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Characteristics of soil organic matter (SOM) are important, especially in the Amazon region, which represents one of theworld's most relevant carbon reservoirs. In this work, the concentrations of carbon and differences in its composition (humification indexes) were evaluated and compared for several horizons (0 to 390 cm) of three typical Amazonian podzol profiles. Fluorescence spectroscopy was used to investigate the humic acid (HA) fractions of SOM isolated from the different samples. Simple and labile carbon structures appeared to be accumulated in surface horizons, while more complex humified compounds were leached and accumulated in intermediate and deeper Bh horizons. The results suggested that the humic acids originated from lignin and its derivatives, and that lignin could accumulate in some Bh horizons. The HA present in deeper Bh horizons appeared to originate from different formation pathways, since these horizons showed different compositions. There were significant compositional changes of HA with depth, with four types of organic matter: recalcitrant, humified, and old dating; labile and young dating; humified and young dating; and little humified and old dating. Therefore, the humification process had no direct relation with the age of the organic matter in the Amazonian podzols. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：160 / 167

页数：8

共 42 条

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