Lewin Simon, Wehrhan Marc, Wende Sonja, Sommer Michael, Kolb Steffen
Microbial Biogeochemistry, Research Area Landscape Functioning, Leibniz Centre for Agricultural Landscape Research e.V. (ZALF), 15374 Müncheberg, Germany.
Julius Kühn Institute (JKI)-Federal Research Centre for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Messeweg 11-12, 38104 Braunschweig, Germany.
ISME Commun. 2025 Mar 21;5(1):ycaf020. doi: 10.1093/ismeco/ycaf020. eCollection 2025 Jan.
Tillage erosion poses threats to crop yields. A transition towards more sustainable agricultural practices may be advanced by harnessing ecosystem services provided by plant microbiomes. However, targeting microbiomes at the agroecosystem scale necessitates bridging the gap to microscale structures of microbiomes. We hypothesized that differences of microbial nitrogen (N) cycle guilds in the rhizosphere of rye align with a soil catena that has been formed by tillage erosion. The rhizosphere was sampled at four sites, which captured a complete tillage erosion gradient from extremely eroded to depositional soils. The gene abundances characteristic of microbial N cycle guilds were assessed via metagenomics. The eroded sites showed the lowest plant productivity and soil mineral N availability, which was associated with an enrichment of in the rhizosphere. Genes associated with dissimilatory nitrate-to-ammonium reducers and diazotrophy prevailed in the eroded soil profiles. The strongest correlations of the biomasses of rye plants along the catena with N cycle functions were observed for . Thus, tillage erosion as a legacy of agricultural management aligns with substantial differences in rhizosphere microbiome functionality in N cycling. These microbiome differences were linked to plant shoot properties. Thus, the dynamics of the microbiome can be indirectly assessed by remote sensing.
耕作侵蚀对作物产量构成威胁。利用植物微生物群落提供的生态系统服务，可能会推动向更可持续农业实践的转变。然而，在农业生态系统尺度上针对微生物群落，需要弥合与微生物群落微观结构之间的差距。我们假设黑麦根际微生物氮（N）循环功能群的差异与由耕作侵蚀形成的土壤序列一致。在四个地点采集根际样本，这些地点涵盖了从极度侵蚀土壤到沉积土壤的完整耕作侵蚀梯度。通过宏基因组学评估微生物N循环功能群的基因丰度。侵蚀地点的植物生产力和土壤矿质氮有效性最低，这与根际中[此处原文缺失具体物质]的富集有关。与异化硝酸盐还原为铵的还原菌和固氮作用相关的基因在侵蚀土壤剖面中占主导地位。沿着土壤序列，观察到黑麦植物生物量与N循环功能之间最强的相关性是[此处原文缺失具体物质]。因此，作为农业管理遗留问题的耕作侵蚀与根际微生物群落在氮循环功能上的显著差异相关。这些微生物群落差异与植物地上部分特性有关。因此，微生物群落的动态可以通过遥感间接评估。
