Effects of bioturbation on rates of vertical and horizontal sediment and nutrient fluxes

生物扰动对垂直和水平沉积速率和养分通量的影响

• 批准号: 408245331
• 负责人: Professor Dr. Jörg Bendix, since 1/2019
• 金额: --
• 依托单位: Arbeitsgruppe Naturschutz
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/408245331?language=en
• 关键词: Effects; bioturbation; rates; vertical; horizontal

Ground-dwelling animals act as ecosystem engineers that affect the structure and composition of the vegetation and thereby also ecosystem processes like soil formation, decomposition and carbon storage. Bioturbation has also links to the redistribution of solid and soluble particles and increases the patchiness of water and nutrient availability with consequences for plant assemblages and for soil organisms. However, most published studies on bioturbation have a local perspective and comprehensive, spatially explicit analyses of the influence of ground-dwelling organisms on rates of sediment and nutrient redistribution in the weathering zone and on hill slopes covering a broad climatic gradient are lacking. We thus aim to i) estimate the spatial distribution, abundance and functional type of the bioturbators in the EarthShape primary focus areas and along its climate gradient, ii) quantify the vegetation along this gradient and determine its relation to distribution and abundance of burrowing animals, iii) quantify effects of bioturbators on soil, nutrients and sediment redistribution, and iv) derive catchment-wide redistribution and erosion rates of the effects of bioturbators by using remote sensing and modelling techniques based on plot-derived transfer functions between climate, vegetation and abundance of species.

地面动物作为生态系统工程师，影响植被的结构和组成，从而也影响土壤形成，分解和碳储存等生态系统过程。生物扰动还与固体和可溶性颗粒的重新分布有关，增加了水和养分供应的不均匀性，对植物组合和土壤生物产生了影响。然而，大多数已发表的生物扰动的研究有一个地方的角度和全面的，空间上明确的分析的影响，地面生活的生物对沉积物的速度和养分再分配的风化带和山坡上覆盖广泛的气候梯度是缺乏的。因此，我们的目标是：i）估计地球形状主要重点区域及其气候梯度沿着生物扰动物的空间分布、丰度和功能类型，ii）量化该梯度沿着的植被，并确定其与穴居动物分布和丰度的关系，iii）量化生物扰动物对土壤、养分和沉积物再分布的影响，㈣根据气候、植被和物种丰富度之间的地块转换函数，利用遥感和建模技术，得出生物扰动影响的全流域再分布率和侵蚀率。