期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 43, 期 4, 页码 702-717出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2010.04.006
关键词
Soil-climate interactions; Carbon-nitrogen interactions; SOM; Rhizosphere; Priming; Greenhouse gases; Black nitrogen; Organic nitrogen; Model; Climate change; GCM; Uncertainties; Scaling
类别
资金
- 'Focus on Soils' at the Swedish University of Agricultural Sciences
The objective of this review was to identify, address and rank knowledge gaps in our understanding of five major soil C and N interactions across a range of scales from molecular to global. The studied five soil C and N interactions are: i) N controls on the soil emissions of greenhouse gases, ii) plant utilisation of organic N, iii) impact of rhizosphere priming on C and N cycling, iv) impact of black N on the stabilisation of soil organic matter (SUM) and v) representation of fractions of SUM in simulation models. We ranked the identified knowledge gaps according to the importance we attached to them for functional descriptions of soil climate interactions at the global scale, for instance in general circulation models (GCMs). Both the direct and indirect influences on soil climate interactions were included. We found that the level of understanding declined as the scale increased from molecular to global for four of the five topics. By contrast, the knowledge level for SUM simulation models appeared to be highest when considered at the ecosystem scale. The largest discrepancy between knowledge level and importance was found at the global modelling scale. We concluded that a reliable quantification of greenhouse gas emissions at the ecosystem scale is of utmost importance for improving soil climate representation in GCMs. We see as key questions the identification of the role of different N species for the temperature sensitivity of SUM decomposition rates and its consequences for plant available N. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据