Sources and composition of soil organic matter fractions between and within soil aggregates

化学 分数(化学) 土壤有机质 微粒 环境化学 有机质 土壤水分 碳纤维 化学成分 作文(语言) 大块土 腐殖质 总有机碳 有机化学 土壤科学 哲学 复合数 复合材料 语言学 环境科学 材料科学
作者
Johan Six,Georg Guggenberger,Keith Paustian,Ludwig Haumaier,E. T. Elliott,Wolfgang Zech
出处
期刊:European Journal of Soil Science [Wiley]
卷期号:52 (4): 607-618 被引量:274
标识
DOI:10.1046/j.1365-2389.2001.00406.x
摘要

Summary It is generally accepted that particulate organic matter derives from plants. In contrast, the enriched labile fraction is thought by many to derive from microbes, especially fungi. However, no detailed chemical characterization of these fractions has been done. In this study, we wanted to assess the sources (plants or microbes; fungi or bacteria) and degree of microbial alteration of (i) three particulate organic matter fractions – namely the free light fraction (1.85 g cm −3 ), the coarse (250–2000 μm) and the fine (53–250 μm) intra‐aggregate particulate organic matter fractions – and of (ii) three density fractions of fine‐silt associated carbon – namely < 2.0, 2.0–2.2 (i.e. enriched labile fraction) and > 2.2 g cm −3 – by analysing the amino sugars, by CuO oxidation analyses, and by 13 C‐, 1 H‐ and 31 P‐NMR analyses. Macroaggregates (250–2000 μm) were separated by wet‐sieving from a former grassland soil now under a no‐tillage arable regime. The three particulate organic matter fractions and the three density fractions were isolated from the macroaggregates by a combination of density flotation, sonication and sieving techniques. Proton NMR spectroscopy on alkaline extracts showed that the enriched labile fraction is not of microbial origin but is strongly degraded plant material that is enriched in aliphatic moieties partly bound to aromatics. In addition, the enriched labile fraction had a glucosamine content less than the whole soil, indicating that it is not enriched in carbon derived from fungi. Decreasing yields of phenolic CuO oxidation products and increasing side‐chain oxidation in the order coarse intra‐aggregate particulate organic matter < fine inter‐aggregate particulate organic matter < fine‐silt fractions indicate progressive alteration of lignin as particle size decreases. The light fraction was more decomposed than the coarse inter‐aggregate particulate organic matter, as indicated by (i) its larger ratio of acid‐to‐aldehyde of the vanillyl units released by CuO oxidation, (ii) the smaller contribution of H in carbohydrates to total extractable H as estimated by 1 H‐NMR spectroscopy, and (iii) a larger contribution of monoester P to total extractable P in the 31 P‐NMR spectra. In conclusion, the four fractions are derived predominantly from plants, but microbial alteration increased as follows: coarse inter‐aggregate particulate organic matter < light fraction ≈ fine inter‐aggregate particulate organic matter < enriched labile fraction.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
tigger完成签到 ,获得积分10
刚刚
2秒前
4秒前
优雅的千雁完成签到,获得积分10
6秒前
2316690509完成签到 ,获得积分10
6秒前
没用的三轮完成签到,获得积分10
6秒前
fancy完成签到 ,获得积分10
6秒前
mayberichard完成签到,获得积分10
10秒前
LINDENG2004完成签到 ,获得积分10
16秒前
wz完成签到,获得积分10
17秒前
简奥斯汀完成签到 ,获得积分10
24秒前
五本笔记完成签到 ,获得积分10
24秒前
27秒前
花花发布了新的文献求助20
27秒前
asd113发布了新的文献求助10
31秒前
美满的小蘑菇完成签到 ,获得积分10
31秒前
自然白安完成签到 ,获得积分10
37秒前
量子星尘发布了新的文献求助10
40秒前
等待小鸽子完成签到 ,获得积分10
42秒前
龙虾发票完成签到,获得积分10
49秒前
小康学弟完成签到 ,获得积分10
49秒前
了0完成签到 ,获得积分10
49秒前
慕青应助科研通管家采纳,获得10
52秒前
彭于晏应助科研通管家采纳,获得30
52秒前
毛豆爸爸应助科研通管家采纳,获得20
52秒前
林利芳完成签到 ,获得积分0
53秒前
JaneChen完成签到 ,获得积分10
55秒前
健壮惋清完成签到 ,获得积分10
55秒前
56秒前
gabee完成签到 ,获得积分10
1分钟前
liang19640908完成签到 ,获得积分10
1分钟前
奋斗的雪曼完成签到 ,获得积分10
1分钟前
粗心的飞槐完成签到 ,获得积分10
1分钟前
LELE完成签到 ,获得积分10
1分钟前
了0完成签到 ,获得积分10
1分钟前
apocalypse完成签到 ,获得积分10
1分钟前
guhao完成签到 ,获得积分10
1分钟前
指导灰完成签到 ,获得积分10
1分钟前
善良的火完成签到 ,获得积分10
1分钟前
优雅夕阳完成签到 ,获得积分10
1分钟前
高分求助中
【提示信息,请勿应助】关于scihub 10000
Les Mantodea de Guyane: Insecta, Polyneoptera [The Mantids of French Guiana] 3000
徐淮辽南地区新元古代叠层石及生物地层 3000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Handbook of Industrial Diamonds.Vol2 1100
Global Eyelash Assessment scale (GEA) 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 550
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4038066
求助须知:如何正确求助?哪些是违规求助? 3575779
关于积分的说明 11373801
捐赠科研通 3305584
什么是DOI,文献DOI怎么找? 1819239
邀请新用户注册赠送积分活动 892655
科研通“疑难数据库(出版商)”最低求助积分说明 815022