Abstract:

In order to improve the quality of urban landscape greenbelt soil, to keep the urban greenbelt sustainable and healthy, the important characters of urban greenbelts in the nine main districts of Chongqing, such as the bulk density, anthropic-materials，organic matter, available N, P, K and biological quality, were investigated. The results showed that there were five most significant factors resulting in the hardening of the urban soil. The first was the artificial compaction. The total average value of soil bulk density was (1.47±0.05) g/cm3, the highest one was 1.72 g/cm3. The second was a lot of anthropic-materials. The average number was (40.2±4.43)%. The third was low organic content. The average value was (27.2±1.1) g/kg, available N and K content were low, available N content was (39.4±1.1) mg/kg, while available K was (87.3±1.9) mg/kg. The fourth was the unreasonable plant disposition. The last factor was unbalance in the population of soil microbes. The average number of bacteria, fungi and actinomycete respectively were (29.71±7.8)×105 cfu/g, (9.98±1.55)×103 cfu/g and (7.6±1.64)×105 cfu/g. Based on the principles of landscape ecology and symbiosis science, the integrative techniques were put forward for improving hardened and impervious urban landscape soil. The integrative improved techniques will benefit to the sustainable development of the urban greenbelts.