ABSTRACT

This study examines the growth performances, nutrient uptake and potential methane yield of six energy crops fertilized with the digestate liquid fraction (DLF) with or without arbuscular mycorrhizal fungi (AMF) inoculation. The 3-year-experiment involved the four perennial (Arundo donax L. Miscanthus × giganteus Greef et Deu, Heliantus tuberosus L. Lolium perenne L.) and two annual (Zea mays L. and Sorghum bicolor (L.) Moench × sudanense Stapf.) crops. The cumulative highest yield was observed for A. donax (128.1 ± 8.4 Mg ha⁻¹), followed by M. × giganteus and S. bicolor (83.0 ± 8.0 Mg ha⁻¹), H. tuberosus and Z. mays (66.2 ± 7.7 Mg ha⁻¹) and L. perenne (31.4 ± 2.9 Mg ha⁻¹). A. donax showed the highest estimated methane yield per hectare (11.030 Nm³ ha⁻¹). After 3 years, the fertilization with DLF increased the initial soil Na⁺ content by 76.9%. During the experiment, only temporary and marginal effects were shown by AMF inoculation, which did not affect biomass production by any crop. Interestingly, AMF significantly increased the NO₃-N concentration (+70%) while it reduced the NH₄-N concentration in percolation water (−32.8%). DLF could be considered a viable organic fertilizer for biomass production, but the soil Na⁺ concentration should be carefully monitored.

摘要

本研究考察了六种能源作物的生长性能、养分吸收和潜在甲烷产量，这些作物用沼渣液体部分（DLF）施肥，接种或不接种丛枝菌根真菌（AMF）。为期 3 年的实验涉及四种多年生植物（Arundo donax L. Miscanthus × giganteus Greef et Deu、Heliantus tuberosus L. Lolium perenne L.）和两种一年生植物（Zea mays L. 和Sorghum bicolor (L.) Moench ×  sudanense Stapf .) 农作物。累积最高产量为A. donax (128.1 ± 8.4 Mg ha ⁻¹ )，其次是M. × giganteus和S. bicolor (83.0 ± 8.0 Mg ha ⁻¹ )、H. tuberosus和Z. mays (66.2 ± 7.7 Mg ha ⁻¹ ) 和L. perenne (31.4 ± 2.9 Mg ha ⁻¹ )。A. donax显示出每公顷最高的估计甲烷产量（11.030 Nm ³ ha ^-1）。3年后，施DLF使土壤初始Na ⁺含量增加76.9%。实验过程中，AMF接种仅表现出暂时的边际效应，并未影响任何作物的生物量产量。有趣的是，AMF 显着增加了 NO ₃-N浓度(+70%)，同时降低了渗滤水中的NH _{4 -N浓度(-32.8%)。}DLF 可以被认为是生物质生产的可行有机肥料，但应仔细监测土壤 Na ^+浓度。