Methods for physical separation and characterization of soil organic matter fractions
文献类型：期刊论文
| 作者 | CAMBARDELLA CA ; ELLIOTT ET |
| 刊名 | GEODERMA
 |
| 出版日期 | 1993 |
| 卷号 | 56期号:1-4页码:449-457 |
| 关键词 | Particle-size Fractions Ultrasonic Dispersion Nitrogen Carbon Sedimentation |
| ISSN号 | 0016-7061 |
| 英文摘要 | Turnover of soil organic matter (SOM) is coupled to the cycling of nutrients in soil through the activity of soil microorganisms. Biological availability of organic substrate in soil is related to the chemical quality of the organic material and to its degree of physical protection. SOM fractions can provide information on the turnover of organic matter (OM), provided the fractions can be related to functional or structural components in soil. Ultrasonication is commonly used to disrupt the soil structure prior to physical fractionation according to particle size, but may cause redistribution of OM among size fractions. The presence of mineral particles in size fractions can complicate estimations of OM turnover time within the fractions. Densiometric separation allows one to physically separate OM found within a specific size class from the heavier-density mineral particles. Nutrient contents and mineralization potential were determined for discrete size/density OM fractions isolated from within the macroaggregate structure of cultivated grassland soils. Eighteen percent of the total soil C and 25% of the total soil N in no-till soil was associated with fine-silt size particles having a density of 2.07-2.21 g/cm3 isolated from inside macroaggregates (enriched labile fraction or ELF). The amount of C and N sequestered in the ELF fraction decreased as the intensity of tillage increased. The specific rate of mineralization (mug net mineral N/mug total N in the fraction) for macroaggregate-derived ELF was not different for the three tillage treatments but was greater than for intact macroaggregates. The methods described here have improved our ability to quantitatively estimate SOM fractions, which in turn has increased our understanding of SOM dynamics in cultivated grassland systems. |
| 公开日期 | 2011-01-07 |
| 源URL | [http://ir.yic.ac.cn/handle/133337/3172]  |
| 专题 | 烟台海岸带研究所_科研共享资源 |
| 推荐引用方式 GB/T 7714 | CAMBARDELLA CA,ELLIOTT ET. Methods for physical separation and characterization of soil organic matter fractions[J]. GEODERMA ,1993,56(1-4):449-457. |
| APA | CAMBARDELLA CA,&ELLIOTT ET.(1993).Methods for physical separation and characterization of soil organic matter fractions.GEODERMA ,56(1-4),449-457. |
| MLA | CAMBARDELLA CA,et al."Methods for physical separation and characterization of soil organic matter fractions".GEODERMA 56.1-4(1993):449-457. |
入库方式： OAI收割
来源：烟台海岸带研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。