Occurrence and distribution of ester-bound lipids in Dutch coastal dune soils along a pH gradient

被引:111
作者
Nierop, KGJ
Naafs, DFW
Verstraten, JM
机构
[1] Univ Amsterdam, Ctr Geoecol Res, IBED Phys Geog, NL-1018 WV Amsterdam, Netherlands
[2] Univ Utrecht, Fac Earth Sci, NL-3508 TA Utrecht, Netherlands
关键词
D O I
10.1016/S0146-6380(03)00042-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The base-hydrolysable fraction of roots and soil organic matter (SOM) in mineral subsoils from oak forests (coastal dunes. The Netherlands) with a soil pH varying from pH (CaCl2) 6.9 to 3.5 were analysed both quantitatively and qualitatively. Comparison of thermally assisted hydrolysis and methylation (THM) using tetramethylammonium hydroxide (TMAH) with base hydrolysis data confirmed that base hydrolysis is an efficient way of analysing ester-linked compounds in soils. The compounds released from SOM upon base hydrolysis comprised largely suberin-derived lipids, which were clearly related to the oak vegetation and, in particular, to oak roots. Compared with fresh (fine) roots, which are largely responsible for the input of SOM in the subsoils, unsaturated and epoxy compounds decreased in soil. probably due to oxidation. The amounts of the saponifiable fraction increased upon acidification, whilst hardly any changes were observed in their composition. This accumulation, without significant compositional alteration of ester-bound moieties in acidic soils, indicates that these chemically labile compounds can be preserved in soils. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:719 / 729
页数:11
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