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鼎湖山生物圈保护区马尾松林凋落物的分解及其营养动态研究
引用本文:莫江明,布朗,孔国辉,兰娜玛丽尼,张佑昌.鼎湖山生物圈保护区马尾松林凋落物的分解及其营养动态研究[J].植物生态学报,1996,20(6):534-542.
作者姓名:莫江明  布朗  孔国辉  兰娜玛丽尼  张佑昌
作者单位:中国科学院华南植物研究所鼎湖山树木园,美国伊莉诺大学林学系,中国科学院华南植物所
摘    要: 本文报道了鼎湖山生物圈保护区马尾松林凋落物分解及其营养动态的情况。松针和混合凋落物的失重率在试验过程中均呈直线下降。松针和混合凋落物的分解系数(K)分别为0.44a-1和0.37a-1。在凋落物分解过程中氮是5个元素中唯—的1个元素,它表现出浓度和绝对量均首先呈上升然后下降的变化。磷和钙的浓度和绝对量在凋落物分解过程中,表现相类似的变化模型。它们的释放速率较其它元素更类似于凋落物的失重率。钾是5个元素中最活跃的元素。其浓度和绝对量的变化在凋落物分解过程中相类似:在分解初期(30到50天)迅速下降后呈缓慢的变化。镁的浓度和绝对量在分解初期以相对快的速率下降后,呈现两种绝然不同的变化:绝对量渐渐下降而浓度则慢慢上升。5个元素的流动性比较,在两种凋落物的分解过程中,均早K>Mg>P>Ca>N的顺序变化。

关 键 词:马尾松  鼎湖山生物圈保护区  凋落物分解

LITTER DECOMPOSITION AND ITS NUTRIENT DYNAMICS OF A PINE FOREST IN DINGHUSHAN BIOSPHERE RESERVE
Mo Jiang-ming.LITTER DECOMPOSITION AND ITS NUTRIENT DYNAMICS OF A PINE FOREST IN DINGHUSHAN BIOSPHERE RESERVE[J].Acta Phytoecologica Sinica,1996,20(6):534-542.
Authors:Mo Jiang-ming
Abstract:Litter decomposition and its nutrient dynamics of a pine forest in Dinghushan Biosphere Reserve were studied in a period of 572 days. Mass loss in both decomposing pine needles and mixed litter (about half pine needles and half understorey litter) showed linear decrease with time during the experiment. The decomposition coefficients (k) were 0.44 a-1 and 0.37 a-1 for pine needles and mixed litter, respectively. Nitrogen was the only element that showed increase, in the first period, in concentrations (in the first 329 days for needles, 117 days for mixed litter) and in contents (at about 200~250 days), and thereafter showed decrease over the rest of the experiment. P and Ca exhibited similar pattern in terms of concentrations and contents, close to the linear rate of mass loss. K is the most mobile element. Its patterns of concentrations and contents in decomposing litter were similar: the greatest loss during the first period (30 to 50 days), after then slightly fluctuate. Mg showed a relatively rapid initial loss in terms of concentrations and contents, thereafter followed a steady decline in contents but slowly increased in concentrations. The nutrient mobilities of the five elements in both processes of decomposing litter followed the following order: K>Mg>P>Ca>N.
Keywords:Pinus massoniana  Dinghushan Biosphere Reserve  litter decomposition  Nutrient dynamics  Subtropics  
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