Cultivation-Induced Effects on the Organic Matter in Degraded Southern African Soils

被引：10

作者：

Pardo, M. T. ^{[1
]}

Almendros, G. ^{[2
]}

Zancada, M. C. ^{[1
]}

Lopez-Fando, C. ^{[1
]}

Gonzalez-Vila, F. J. ^{[3
]}

机构：

[1] CSIC, ICA, Madrid 28006, Spain

[2] CSIC, Museo Nacl Ciencias Nat, E-28006 Madrid, Spain

[3] CSIC, Inst Recursos Nat & Agrobiol, E-41080 Seville, Spain

来源：

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS | 2012年 / 43卷 / 03期

关键词：

C-13; NMR; Curie-point pyrolysis; soil management; soil respiration; tropical soils; HUMIC SUBSTANCES; LAND-USE; CHEMICAL-STRUCTURE; FARMING SYSTEMS; CARBON; FRACTIONS; FOREST; DESCRIPTORS; MANAGEMENT; VEGETATION;

D O I：

10.1080/00103624.2012.639428

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

We studied quantitative and qualitative changes in soil organic matter (SOM) due to different land uses (reference woodland versus cultivated) on six soils from Tanzania (Mkindo and Mafiga), Zimbabwe (Domboshawa and Chickwaka), and South Africa (Hertzog and Guquka). Structural characteristics of the humic acids (HAs) were measured by Curie-point pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and solid-state C-13 nuclear magnetic resonance (CPMAS C-13 NMR) spectroscopy. Significant changes in concentration and composition of SOM were observed between land uses. Losses of organic carbon after cultivation ranged from 35% to 50%. Virgin soils showed large proportions of colloidal humus fractions: humic acids (HAs) and fulvic acids (FAs) but negligible amounts of not-yet decomposed organic residues. The change in land use produced a contrasting effect on the composition of the HAs: a noteworthy "alkyl enhancement" in Mkindo soil and "alkyl depletion" in Chikwaka and to a lesser extent in Domwoshawa. The remaining soils displayed only minor alterations.

引用

页码：541 / 555

页数：15

共 38 条

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