城市园林土壤板结机理及改良研究

为了改良城市园林板结土壤的质量,促进城市绿地持续、健康发展,对重庆市主城9区园林绿化板结土壤的容重、粗骨物质、有机质、碱解氮、有效磷、速效钾、微生物种群数量、植物配置等理化及生物学性质进行了研究。结果表明,城市园林绿化土壤板结的主要原因是:(1)人为压实严重,土壤容重总平均值为(1.47±0.05)g/cm3,最高的可达1.72g/cm3;(2)粗骨物质多,各区含量总平均值为(40.2±4.43)%;(3)有机质含量低,总平均值为(27.2±1.1)g/kg;碱解氮、速效钾等有效养分含量偏低,总平均值分别为(39.4±1.1)mg/kg和(87.3±1.9)mg/kg;(4)植物配置不合理;(5)土壤微生物种群数量少,细菌数量、真菌数量和放线菌数量的总平均值分别为(29.71±7.8)×105cfu/g、(9.98±1.55)×103cfu/g和(7.6±1.64)×105cfu/g。基于城市园林土壤的板结机理,结合景观生态学、共生生物学原理,提出了改良城市园林板结土壤的综合配套改良技术。

Mechanism and Improvement on Urban Landscape Greenbelt Soil Hardening

In order to improve the quality of urban landscape greenbelt compacted soil and to keep the sustainable and healthy development of urban greenbelt, some main characters of urban greenbelts in the nine main districts of Chongqing were studied, such as bulk density, anthropic-materials,organic matter, available N, P and K, and soil microbe population, were investigated. The results showed that there were five most significant factors resulting in the hardening of the urban soil. The first was artificial compa...