The production and chemical composition of the biomass of four fast growing woody crops are studied across species and rotation cycles. High-density plantations of poplar, willow, black locust and sycamore were monitored for 9 years over 3-year rotation cycles in marginal land in the Mediterranean area. The fuel quality properties of the produced biomass was assessed using proximate and ultimate analysis, biomass and ash chemical composition (23 elements), and ash melting behaviour.

Willow, poplar and black locust energy crops produced 12, 9 and 7 dry Mg ha⁻¹ yr⁻¹ on average, indicating that these species can be well adapted to the unfavourable conditions of poor soils in low productivity areas in the Mediterranean region. In contrast, sycamore was not well adapted to the particular climate and soil conditions and provided very poor yields. The chemical composition of the biomass varied across species and rotation cycles. The results obtained from the chemical analysis of these woody species showed that they provided good quality for use in combustion processes, with low amounts of trace elements and chlorine (≈0.01 wt%), sulphur (≈0.04 wt%) and nitrogen (≈0.5 wt%), with the exception of black locust (N = 0.86 wt%). No sintering problems are expected during the combustion of the studied biomass. This study provides valuable information for the large-scale implementation of fast growing woody species dedicated to energy crops in low productivity areas of the Mediterranean region.

跨物种和轮换周期研究了四种快速生长的木本作物生物量的生产和化学组成。在3年轮作周期中，对地中海边缘地区的杨树，柳树，刺槐和无花果的高密度人工林进行了为期9年的监测。使用最近和最终分析，生物质和灰分的化学成分（23种元素）以及灰分融化行为，评估了生产的生物质的燃料质量特性。

柳树，杨树和刺槐能源作物生产了12、9和7干燥的Mg ha ^-1 yr ^-1平均而言，这表明这些物种可以很好地适应地中海地区低产地区贫瘠土壤的不利条件。相反，美国梧桐不能很好地适应特定的气候和土壤条件，单产非常低。生物质的化学组成随物种和旋转周期而变化。从这些木本物种的化学分析中获得的结果表明，它们为燃烧过程提供了良好的质量，微量元素和氯（≈0.01wt％），硫（≈0.04wt％）和氮（≈0.5）的含量很低。 wt％），除了黑刺槐（N = 0.86 wt％）。在研究的生物质燃烧过程中不会出现烧结问题。