The random sampling method was adopted to analyze the falling seed rain of subalpine Community of Larix potaninii-Quercus spp.and soil seed pool.The results showed that the rain was composed of the seeds of 5 main tree species,happening in Sept.-Nov of each year,3520 particle/m2.While soil seed pool was composed of 17 species plants,belonging to 15 genera and 9 families,mainly perennial herbaceous plant,about 75% seeds of which distributed in shallow soil layer.Similarity coefficient between the plants species of soil seed pool and overground plant species was only 0.0426,which showed that there was no clear correlation between seed pool and overground vegetation.

随着人民群众物质文化生活的不断丰富和提高.人们对城市绿化环境的需求愈来愈高,这就要求我们在设计植物群落时,既要创造独特的令人赏心悦目的自然环境,又要发挥植物多功能的作用,保护人们赖以生存的生活空间,使城市的自然生态环境不断改善.针对城市园林绿化普遍存在的问题,提出以下探索.

The change of soil chemical properties of Quercus pannosa forest in subalpine area of northwest Yunnan was explored.The results indicated that the soil chemical properties were correlated with the different stages of vegetation succession.All the indexes of soil chemical properties showed the tendency to sound development as the progress of positive succession.The specific performance were decrease of pH value,increase of organic matter,total N and hydrolytic N.The content of available K achieved the maximum value before the climax vegetation,and slightly decreased at the climax vegetation.The change of P did not show obvious regular during the course of succession.As the succession of vegetation,the nutrient contents in the upper layer were higher than the lower layer.It is concluded that the soil chemical properties of the studied area are positively correlated with the sound development of plant community.