有机质
土壤有机质
土壤水分
生物量(生态学)
环境科学
农学
总有机碳
腐殖质
化学
土壤科学
环境化学
生物
有机化学
作者
D. S. Jenkinson,J. H. Rayner
出处
期刊:Soil Science
[Lippincott Williams & Wilkins]
日期:1977-05-01
卷期号:123 (5): 298-305
被引量:1165
标识
DOI:10.1097/00010694-197705000-00005
摘要
Data are assembled from the Rothamsted classical field experiments on the effects of long-continued cropping and manuring on the amount of organic matter in soil, on the age of this soil organic matter, on the amount of microbial biomass in the soil, and on the rate at which plant residues decompose in these soils. These data were then fitted to a model in which soil organic matter was separated into five compartments: decomposable plant material (DPM, half-life 0.165 years); resistant plant material (RPM, 2.31 years); soil biomass (BIO, 1.69 years); physically stabilized organic matter (POM, 49.5 years) and chemically stabilized organic matter (COM, 1980 years) For unitary input of plant material (1 t fresh plant C ha-1 year-1) under steady-state conditions, after 10,000 years, the model predicts that the soil will contain 0.01 t C in DPM, 0.47 t in RPM, 0.28 t in BIO, 11.3 t in POM, and 12.2 t in COM. The predicted radiocarbon age is 1240 years (equivalent age). The fit between predicted and measured data is sufficiently good to suggest that the model is a useful representation of the turnover of organic matter in cropped soils.
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