土壤是植物生长的主要场所,因而土壤理化性状的好坏是决定根系能否正常生长的重要因素。所以在绿化建设中,一手抓苗木质量,一手抓土壤质量是搞好绿化工程中两个都不能忽视的重要方面。然而,在城市绿化中,很多土壤都是搞建筑时从深层挖出来的底土、死土,不但板结、不透气、不透水,还含有大量对植物有害的还原物质,导致根系缺氧窒息,积水腐烂,最终死亡。为 Soil is the main site of plant growth, so the physical and chemical properties of soil is an important factor in determining whether the root can grow normally. Therefore, in afforestation construction, one hand grasp the quality of nursery stock, grasping soil quality is one of the important aspects that can not be neglected in the greening project. However, in the afforestation of cities, many soils are subsoils dug out from the deep during construction. Dead soil, not only compacted, impermeable to air and water, but also contains a large amount of reducing substances that are harmful to plants, resulting in suffocation of hypoxia in roots, Water decay eventually dies. for