Abu-Ziada M E
Department of Botany, Faculty of Science, Mansoura University, Mansoura, Egypt.
Pak J Biol Sci. 2007 Jun 15;10(12):2025-38. doi: 10.3923/pjbs.2007.2025.2038.
The present study contributes information about the environmental factors controlling the distribution, variation in standing crop phytomass and chemical compositional change of Ludwigia stolonifera. Also, treatment with cattle manure, as source of organic waste, was made to evaluate the response of the plant to the environmental pollution. The sandy textured bottom sediments of Ludwigia habitat at Damira irrigating canal had higher percentages of organic carbon and total soluble salts in spring than in the other seasons while the overlying water was characterized by low total soluble salts. The phytomass and assimilating surface area were increased in spring and summer months and appeared to decline in winter. The phytochemical constituents were highly concentrated during August. As common in hydrophyte, the plant organs of L. stolonifera are characterized by abundance of aerenchyma, absence of cork cells and reduction of vascular tissues. Addition of cattle manure to the aquatic habitat of Ludwigia plant resulted in an increase of organic carbon, salinity, chloronity and in a decrease of pH value of hydrosoil and water. Heavy metals accumulation showed considerable increase due to application of cattle manure and this appeared to be a reflection to the increased concentrations of these metals in the environment.
本研究提供了有关控制平卧柳分布、现存作物植物量变化及化学成分变化的环境因素的信息。此外，还采用牛粪作为有机废物来源进行处理，以评估该植物对环境污染的响应。达米拉灌溉渠平卧柳栖息地的沙质底质沉积物中，春季的有机碳和总可溶性盐百分比高于其他季节，而覆盖其上的水体总可溶性盐含量较低。植物量和同化表面积在春季和夏季增加，冬季似乎下降。植物化学成分在8月高度浓缩。平卧柳作为水生植物的常见特征，其植物器官具有发达的通气组织、无木栓细胞且维管组织减少。向平卧柳植物的水生栖息地添加牛粪导致水土壤和水体的有机碳、盐度、氯度增加，pH值降低。由于施用牛粪，重金属积累显著增加，这似乎反映了环境中这些金属浓度的增加。
