上海闵行地区松柏类古树名木土壤性状分析与综合评价

Soil Prosperities and Comprehensive Evaluation of Ancient and Rare Conifers in Minhang District of Shanghai

[目的]分析并综合评价上海闵行地区松柏类古树名木土壤性状,加强古树名木的保护。[方法]以上海闵行区松柏类植物样株土壤为研究对象,系统测定其p H、EC值、速效氮磷钾、有机质、通气孔隙度等理化特性,并进行了综合评价分析。[结果]闵行区松柏类古树名木生长环境的土壤中大多数p H均值高于8.0,为中性偏碱性的土壤环境;土壤有机质含量最低值为13.40 g/kg,均值为17.57g/kg,处于中等肥力水平;速效氮、有效磷的含量也明显供应不充足,但速效钾含量较丰富,平均为160.25 mg/kg。[结论]上海闵行地区松柏类古树名木土壤总体含水率偏高,部分样株的土壤通气孔隙度低,通气性较差,这些不利因素会造成植物根系活力不足、土壤盐渍化等,对古树名木的正常生长造成了很大的影响。

[ Objective ] To analyze the soil prosperities of ancient and rare conifers in Minhang District of Shanghai, and to strengthen the protection of ancient and rare trees. [ Method ] With soil from sample conifers in Minhang District as the research object, the physicochemical properties were detected, such as pH, EC value, available nitrogen, phosphorus and potassium, organic matter and aeration porosity. Comprehensive evaluation was carried out. [ Result] Most pH values of ancient and rare conifers in soil were greater than 8.0 in Minhang District, which belonged to neutral alkaline soil environment. Minimum value of soil organic matter content was 13.40 g/kg, with the mean value being 17.57 g/kg, which was at moderate fertility level. Available nitrogen and effective phosphorus content was also obviously insufficient in supply. But the content of available potassium was in a rich level, the average content of which was 160.25 mg/kg. [ Conclusion] Soil moisture content of ancient and rare conifers is relatively high in Minhang District. Soil aeration porosity of some sample is low, with relatively poor air permeability. These unfavorable factors will cause poor plant root vigor and soil salinization, and has great impacts on the normal growth of ancient and rare trees.