Centro de Investigaciones en Fisiología Celular, U.N.A.M., México.
J Chem Ecol. 1983 Aug;9(8):1079-97. doi: 10.1007/BF00982213.
Several shaded coffee plantations in Coatepec, Veracruz (Mexico) are characterized by a dense cover of herbaceous vegetation mainly dominated by species from the Commelinaceae which protect the soil from erosion and presumably contribute to regulating the abundance of other weeds. To detect their alleopathic potential, leachates from fresh, air-dried, or oven-dried plants and litter collected during different months of the year were tested uponBrassica campestris, Bidens pilosa, andRumex sp. seeds. Significant radicle growth inhibitions were obtained mainly from dried plants and litter collected during the rainy season (August). Drainage water collected from pots with fresh, chopped plants and litter produced no inhibitions until the third week of recycling the water. Concentrated soil extracts from chopped plants and litter collected after seven weeks of decomposition produced significant inhibitions on radicle growth ofRumex sp. Dry weight ofBidens pilosa was significantly reduced when grown in soils treated with fresh and chopped plants and litter exposed to natural field conditions for five weeks.
墨西哥韦拉克鲁斯州科阿特佩克的几个遮荫咖啡种植园的特点是草本植被茂密，主要由鸭跖草科的物种组成，这些植被可以保护土壤免受侵蚀，并可能有助于调节其他杂草的丰度。为了检测它们的化感潜力，从新鲜、风干或烘干的植物和在一年不同月份收集的凋落物中提取的浸出液被用于测试 Brassica campestris、Bidens pilosa 和 Rumex sp. 种子。主要从雨季（8 月）收集的干燥植物和凋落物中获得显著的胚根生长抑制作用。从新鲜切碎的植物和凋落物收集的盆排水在回收水的第三周前没有产生抑制作用。从切碎的植物和凋落物收集并分解七周后产生的浓缩土壤提取物对 Rumex sp. 的胚根生长有显著抑制作用。当在暴露于自然田间条件五周的新鲜和切碎的植物和凋落物处理的土壤中生长时，Bidens pilosa 的干重显著降低。
