Influence of soil animals on C and N turnover in rice-based cropping systems

土壤动物对水稻种植系统碳氮周转的影响

• 批准号: 282122312
• 负责人: Professor Dr. Volkmar Wolters
• 金额: --
• 依托单位: ArbeitsgruppeTierökologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 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/282122312?language=en
• 关键词: Influence; soil; animals; turnover; rice

ICON Subproject 3 studies the effect of management diversification on the structure and function of he fauna in the soil of rice-based ecosystems. A particular focus is on a thorough understanding of the actors shaping below-ground communities, and on the mediation of C- and N-flow by soil biota. A fundamental assumption of SP3 is that the development of a native soil fauna with a high inherent potential for interactive regulation significantly contributes to the sustainability of new rice production systems with altered flooding regimes and crops. Potential disservices of the soil fauna will also be tested. SP3 results gained during ICON Phase I prove the important role of the soil fauna in rice-based ecosystems, but the fact that the edaphic community was still in a very early stage of succession hampered far reaching evaluations. Investigations on this issue are thus planned to be continued. SP3-specific objectives for ICON Phase II are: (1) To understand, predict and generalize (across geographic gradients) successional changes and establishment of the soil invertebrate community in response to altered management regimes in rice-based agro-ecosystems (incl. trophic effects); (2) To experimentally quantify indirect, non-trophic effects of soil invertebrates on ecological processes via bioturbation; (3) To assess the potential of the edaphic fauna for facilitating or reducing the efficiency of the ICON mitigation measures. SP3 will strictly adhere to the modified ICON framework, incl. the new research question on up- and downscaling. All methods (field surveys and experiments, mesocosm experiments, food web modeling, analysis of stable isotope signatures) are established and will be further developed if necessary.

ICON分项目3研究管理多样化对以水稻为基础的生态系统土壤中动物的结构和功能的影响。一个特别的重点是对塑造地下社区的行为者的透彻理解，以及土壤生物群对C-和N-流的调解。次级方案3的一个基本假设是，发展具有高度内在互动调节潜力的本土土壤动物，大大有助于改变洪水制度和作物的新水稻生产系统的可持续性。还将测试土壤动物的潜在危害。在ICON第一阶段获得的SP3结果证明了土壤动物在以水稻为基础的生态系统中的重要作用，但事实上，土壤群落仍处于非常早期的演替阶段阻碍了深远的评价。因此，计划继续对这一问题进行调查。ICON第二阶段的SP3具体目标是：（1）了解、预测和概括（跨越地理梯度）土壤无脊椎动物群落的演替变化和建立，以应对以水稻为基础的农业生态系统（包括：营养作用）;（2）通过实验量化土壤无脊椎动物通过生物扰动对生态过程的间接、非营养性影响;（3）评估土壤动物促进或降低ICON缓解措施效率的潜力。SP3将严格遵守修改后的ICON框架，包括：关于放大和缩小尺度的新研究问题。所有方法（实地调查和实验、围隔生态系统实验、食物网建模、稳定同位素特征分析）都已确立，并将在必要时进一步发展。