Linking Landscape, Environment, Agriculture and Food, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017, Lisboa, Portugal; Forest Research Centre, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017, Lisboa, Portugal.
Linking Landscape, Environment, Agriculture and Food, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017, Lisboa, Portugal.
Environ Res. 2020 Dec;191:110090. doi: 10.1016/j.envres.2020.110090. Epub 2020 Aug 22.
In Mediterranean area, Acacia melanoxylon biomass is an abundant waste material from non-native and invasive tree species control actions, requiring suitable disposal. Valorisation of such biomass residues requires its complete characterization to best approach the full potential of each plant material that could suit specific applications. This study compares mature and juvenile A. melanoxylon plant tissues (wood and bark) from two stands in different locations, regarding their chemical characteristics and organic growing media properties, such as mineral content and phytotoxicity effect for Lepidium sativum seeds. Juvenile bark (JB) showed greater total extractives (29%) extracted using solvents of increasing polarity (dichloromethane, ethanol, and water), followed by mature bark (MB) (21%). MB revealed the highest lignin content (>50%) suggesting material resistance to microbial biodegradation in horticultural applications. High barks phenolic content proved to be phytotoxic for cress seeds (null JB root index), although the toxic substances may be removed. After 1 week, ageing effect reduced MB phytototoxicity (root index > 60%) improving seed performance. Bark presented more mineral elements availability than wood. Wood high cellulose (>50%), low extractive (<9%) and moderate total lignin (<30%) contents can be attractive for pulp production, while bark growth medium profile may potentiate its application for horticultural uses. The future research on novel uses of A. melanoxylon plant residues can result in economic benefits that may alleviate management costs.
在地中海地区，金合欢属植物（Acacia melanoxylon）是一种丰富的非本地入侵树种控制行动的废弃生物质，需要进行适当的处理。为了实现这种生物质残余物的增值，需要对其进行全面的特性描述，以充分发挥每种植物材料的潜力，使其适用于特定的应用。本研究比较了来自两个不同地点的成熟和幼年金合欢植物组织（木材和树皮）的化学特性和有机生长介质特性，如矿物含量和对萝卜种子的植物毒性效应。幼龄树皮（JB）使用极性递增的溶剂（二氯甲烷、乙醇和水）提取的总浸出物（29%）更高，其次是成熟树皮（MB）（21%）。MB 表现出最高的木质素含量（>50%），这表明该材料在园艺应用中对微生物生物降解具有较强的抗性。高含量的酚类物质证明对欧芹种子具有植物毒性（幼龄 JB 根指数为零），尽管这些有毒物质可能会被去除。1 周后，老化效应降低了 MB 的植物毒性（根指数>60%），从而提高了种子的性能。树皮比木材具有更多的矿物质元素供应。木材的纤维素含量较高（>50%）、提取物含量较低（<9%）和总木质素含量适中（<30%），适合用于纸浆生产，而树皮的生长介质特性可能使其在园艺用途中得到应用。对金合欢属植物残余物的新用途的未来研究可能会带来经济效益，从而减轻管理成本。
