Importance of soil structure, carbon translocation and crop residue quality for carbon storage in cropland soils

土壤结构、碳转移和作物残茬质量对农田土壤碳储存的重要性

• 批准号: 272816230
• 负责人: Dr. Felix Heitkamp
• 金额: --
• 依托单位: Institut für Umweltwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/272816230?language=en
• 关键词: Importance; soil; structure; carbon; translocation

Cropland soils may be a sink or source for atmospheric CO2. In general, it is assumed that C-input into soil and soil organic carbon (SOC) levels are linearly related. This gives rise to environmental concerns regarding the removal of crop residue. In recent years it has been shown that residue incorporation increases SOC levels only to small extents. In the well designed and documented long-term experiment of Puch, Germany, an observed quadratic relationship contradicted the predicted (Rothamsted Carbon model 26-3) relationship of C-input (range of 1-5 Mg C ha-1 year-1) and SOC changes. The purpose of the proposed project is to find explanations for the observed relationships by considering soil structure, nitrogen availability, and carbon saturation effects. Controlled short-term incubation experiments, physical, biological and chemical fractionation methods and development of soil structural properties will be related to the less controlled, but long-term, findings of the field experiment. Explaining the deviations between prediction and observation in this case study will be an important step in designing a climate friendly and economically sound agriculture while sustaining physical, biological and chemical soil fertility.

农田土壤可能是大气CO2的汇或源。一般认为，土壤碳输入与土壤有机碳（SOC）水平呈线性关系。这引起了关于去除作物残留物的环境问题。近年来，它已被证明，残留物掺入增加SOC水平只有很小的程度。在德国Puch的精心设计和记录的长期实验中，观察到的二次关系与碳输入（1-5 Mg C ha-1年-1的范围）和SOC变化的预测（Rothamsted碳模型26-3）关系相矛盾。该项目的目的是通过考虑土壤结构、氮的有效性和碳饱和效应来解释所观察到的关系。受控的短期培养实验、物理、生物和化学分级方法以及土壤结构特性的发展将与控制较少但长期的实地实验结果有关。解释本案例研究中预测和观测之间的偏差将是设计气候友好和经济合理的农业，同时保持物理，生物和化学土壤肥力的重要一步。

项目成果

Priming effects induced by glucose and decaying plant residues on SOM decomposition: A three-source 13C/14C partitioning study

• DOI: 10.1016/j.soilbio.2018.03.004
• 发表时间: 2018-06
• 期刊: Soil Biology and Biochemistry
• 影响因子: 9.7
• 作者: M. Shahbaz;Amit Kumar;Y. Kuzyakov;G. Börjesson;E. Blagodatskaya

Decadal Nitrogen Fertilization Decreases Mineral‐Associated and Subsoil Carbon: A 32‐Year Study

• DOI: 10.1002/ldr.2667
• 发表时间: 2017-05
• 期刊: Land Degradation & Development
• 影响因子: 4.7
• 作者: M. Shahbaz;Y. Kuzyakov;Shafique Maqsood;Matthias Wendland;F. Heitkamp

Microbial decomposition of soil organic matter is mediated by quality and quantity of crop residues: mechanisms and thresholds

• DOI: 10.1007/s00374-016-1174-9
• 发表时间: 2017-01
• 期刊: Biology and Fertility of Soils
• 影响因子: 6.5
• 作者: M. Shahbaz;Y. Kuzyakov;M. Sanaullah;F. Heitkamp;V. Zelenev;Amit Kumar;E. Blagodatskaya

Decrease of soil organic matter stabilization with increasing inputs : Mechanisms and controls

• DOI: 10.1016/j.geoderma.2016.05.019
• 发表时间: 2017-10
• 期刊: Geoderma
• 影响因子: 6.1
• 作者: M. Shahbaz;Y. Kuzyakov;F. Heitkamp