Temporal and spatial variation of forest biomass in relation to stand dynamics in a mature, lowland tropical rainforest, Malaysia
Temporal and spatial variation of forest biomass in relation to stand dynamics in a mature, lowland tropical rainforest, Malaysia
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DOI：
10.1111/j.1440-1703.2004.00645.x
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发表时间：
2004-05-01
影响因子：
2
通讯作者：
Noor, NSM
中科院分区：
文献类型：
--
作者：
Hoshizaki, K;Niiyama, K;Noor, NSM
为了阐明低地热带雨林碳库大小的一致性，我们计算了马来西亚半岛帕索森林保护区地上生物量的变化。我们估计总地上生物量的一个成熟的立场，从1994年至1998年，每2年在6公顷的地块使用树木普查数据。从1994年（-431兆克公顷）到1998年（-403兆克公顷），地上生物量总量持续下降（1兆克= 10（3）公斤）。这比1973年同一地区0.2公顷部分的数据低得多，表明近几十年来地面生物量的减少可能是一致的。这一趋势与新热带森林的主要趋势形成对照。在1994-1998年期间，森林通过树木生长和补充分别增加了23.0和0.88 Mg ha（-1）的地上总生物量，并因死亡而损失了51.9 Mg ha（-1）。总的来说，生物量减少了28.4兆公顷（-1）（即7.10兆公顷（-1）.年（-1）），这几乎相当于每年每公顷损失一棵直径为76厘米的活树。生物量变化的正负分量分析表明，大树的死亡主导了地上生物量的减少。森林生物量在空间上也各不相同，地上生物量总密度在0.2公顷基础上为212-655兆亿公顷（n= 30个小块，1998年），在1公顷基础上为365-440兆亿公顷。在几个0.2公顷的小区中，总地上生物量密度大幅度下降（每两年每公顷> 50毫克），导致6公顷总地上生物量总体下降。在本研究中，我们讨论了森林动态和生物量波动之间的关联，并强调森林监测和评估土壤和分解系统的成熟森林中的碳循环的含义。
To clarify consistency in the size of carbon pool of a lowland tropical rainforest, we calculated changes in above-ground biomass in the Pasoh Forest Reserve, Peninsular Malaysia. We estimated the total above-ground biomass of a mature stand using tree census data obtained in a 6-ha plot every 2 years from 1994 to 1998. The total above-ground biomass decreased consistently from 1994 (431 Mg ha(-1)) to 1998 (403 Mg ha(-1)) (1 Mg = 10(3) kg). These are much lower than that in 1973 for a 0.2 ha portion of the same area, suggesting that the the total above-ground biomass reduction might have been consistent in recent decades. This trend contrasted with a major trend for neotropical forests. During 1994-1998, the forest gained 23.0 and 0.88 Mg ha(-1) of the total above-ground biomass by tree growth and recruitment, respectively, and lost 51.9 Mg ha(-1) by mortality. Overall, the biomass decreased by 28.4 Mg ha(-1) (i.e. 7.10 Mg ha(-1).year(-1)), which is almost equivalent to losing a 76-cm-diameter living tree per hectare per year. Analysis of positive and negative components of biomass change revealed that deaths of large trees dominated the total above-ground biomass decrease. The forest biomass also varied spatially, with the total above-ground biomass density ranging 212-655 Mg ha(-1) on a 0.2-ha basis (n= 30 subplots, 1998) and 365-440 Mg ha(-1) on a 1 ha basis. A large decrease of the total above-ground biomass density (> 50 Mg per ha per 2 years) in several 0.2-ha subplots contributed to the overall decrease in the 6-ha total above-ground biomass. In the present study, we discuss the association between forest dynamics and biomass fluctuation, and the implication for carbon cycling in mature forests with emphasis on forest monitoring and assessments of soil and decomposition systems.