海口城区绿地不同地面类型对凋落叶分解的影响.doc

海口城区绿地不同地面类型对 凋落叶分解的影响 刘顿1 刘强2( （1中国海洋大学 海洋生命学院 山东 青岛 266100 2 海南师范大学 生命科学学院 海南 海口 571158） 摘要：为了探究城区绿地生态系统中不同地面类型对树木凋落叶分解和养分归还的影响，采用凋落物分解袋法，用海口市城区常见的3种园林树木：羊蹄甲（Bauhinia blakeana）、小叶榕（Ficus microcarpa）、阴香（Cinnamomum burrnanni）的凋落叶在城区绿地常见的3种地面类型：草地、透空砖地面、水泥地面上进行3个月的分解实验。结果发现在不同地面类型上，相同树木凋落叶的分解速率和养分释放快慢的不同，在草地上凋落叶分解最快，在透空砖地和水泥地上凋落叶分解速率接近，但阴香在透空砖地上分解快于水泥地。凋落叶的氮元素和磷元素在草地上释放最快，其次是透空砖地，最慢是在水泥地上；钾元素的释放总的来说很快，但钾元素的释放快慢与地面类型相关性不强。草地最有利于凋落叶的分解和氮、磷养分归还土壤，透空砖地优于水泥地。 关键词：城市绿地；地面类型；凋落叶；分解；养分释放 Effects of the different floor types in urban green space in Haikou city on decomposition of tree leaf litter LIU Dun1, LIU Qiang2﹡ （1. College of Marine Life Science,Ocean University of China,Qingdao 266100, China 2. College of Life Sciences，Hainan Normal University，Haikou 571158China） different types of floor in urban green space ecosystem on the decomposition and nutrient release of tree leaf litter, an experiment was conducted. Leaf litters of 3 common tree species Bauhinia blakeana, Ficus microcarpa and Cinnamomum burrnanni were decomposed on 3 types of common floor in urban green space i.e. lawn, floor with permeable brick and cement floor in Haikou city for 3 months through the litter bag technique. The result showed that the rates of decomposition and nutrient release of the same leaf litter on different types of floor were different. It decomposed fastest on the lawn, and it did nearly fast on the floor with permeable brick and the cement floor. However the litter of C. burrnanni decomposed faster on the floor with permeable brick than on the cement floor. The releases of N and P were fastest on the lawn and second fast on the floor with permeable brick, and slowest on the cement floor. The release of K was generally fast, but it was not correlated with floor types strongly. For the 3 floor types in the ecosystem the lawn is best for litter decomposition and return of N and P to the soil, and the floor with permeable brick is better than the cement floor. Key words: