广州白云山风景名胜区主要林分类型凋落物的研究

1　引　　言在森林生态系统功能的研究中 ,凋落物是重要的研究对象 ,历来受到重视1～ 3 ,8] .凋落物是森林生态系统内物质循环的重要环节 ,是实现植物营养元素生物小循环的载体 ,是林地具有自肥功能的根本原因 .它还对森林资源的保护和永续利用以及水源涵养和水土保持有重要意义 .白云山是广州著名的风景名胜区 ,被誉为广州的“肺腑” ,对广州市的环境建设有举足轻重的作用 .由于白云山的林分供休闲游憩 ,不能施用有异味的有机肥和化肥 ,森林凋落物成为林分生长的重要养分来源 .因此 ,研究白云山主要林分类型的凋落物数量、季节动态、养分…

Litterfalls of major forest stands at Baiyunshan scenic spot of Guangzhou

The productions, seasonal dynamics, macronutrient contents and decomposition rates of the litterfalls of four typical stands, e.g., Pinus massoniana plantation, secondary evergreen broadleaved forest, Acacia mangium plantation and Schima superba-Acacia mangium plantation at the scenic Baiyunshan of Guangzhou were studied. The litterfall productions of four stands in 1998 were 8.34, 6.77, 6.31 and 11.54 t.hm-2, respectively. The seasonal dynamics of litterfall amounts demonstrated the single-peak model with the peak period in June and July. The total amounts of macronutrients returned to the forest land by means of litters in the four stands in 1998 were 26.30, 69.81, 54.9 and 152.24 kg.hm-2, respectively. The annual decomposition rates of the litterfalls were 24.4%, 53.4%, 52.4% and 57.4%.