关键词: 杉木人工林, 凋落物产量, 营养元素归还, 分解, 中山

Abstract: This paper studied the production and nutrient element contents of litterfall in Chinese fir plantation as well as its decomposition placed on the soil above ground and in soil underground in midmountain region of Laoshan,Tianlin county, Guangxi. The results indicate: 1. The mean annual litter in 17-19-year-old Chinese fir plantation is5.176 t·ha^-1 in Laoshan. 2. Total amount of nine nutrient elements of the litterfall returing to thesoil is 118.86 kg·ha^-1)·a^-1, in which N 39. 43, P 2. 02, K 7. 65, Ca 54. 80,Mg 11.68, Mn 3.07, Cu 0.05, Zn 0.12 and B 0.04 kg·ha^-1)·a·^-1 3. The decomposition of litterfall on the soil above ground is comparati-vely slow and the decay rates of the leaf, branch and fruit are 0.3308, 0.2062and 0.2358 g·g·^-1a^-1 respectively. 4. The rate of weight loss, the rate of translocation of nutrient elementsand the quantity of the various groups of microorganisms of the litterfall insoil undergound (20cm) are higher than that on the soil above ground.

Key words: Chinese fir plantation, Litterfall production, Nutrient eiement return, Decomposition, Mid-mountain