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首页> 外文期刊>Ecosystems >Dead Wood Necromass in a Moist Tropical Forest: Stocks, Fluxes, and Spatiotemporal Variability
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Dead Wood Necromass in a Moist Tropical Forest: Stocks, Fluxes, and Spatiotemporal Variability

机译：死木头土壤在潮湿的热带森林中：股票，助体和时空变异性

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Woody debris (WD) stocks and fluxes are important components of forest carbon budgets and yet remain understudied, particularly in tropical forests. Here we present the most comprehensive assessment of WD stocks and fluxes yet conducted in a tropical forest, including one of the first tropical estimates of suspended WD. We rely on data collected over 8 years in an old-growth moist tropical forest in Panama to quantify spatiotemporal variability and estimate minimum sample sizes for different components. Downed WD constituted the majority of total WD mass (78%), standing WD contributed a substantial minority (21%), and suspended WD was the smallest component (1%). However, when considering sections of downed WD that are elevated above the soil, the majority of WD inputs and approximately 50% of WD stocks were disconnected from the forest floor. Branchfall and liana wood accounted for 17 and 2% of downed WD, respectively. Residence times averaged 1.9 years for standing coarse WD (CWD; > 20 cm diameter) and 3.6 years for downed CWD. WD stocks and inputs were highly spatially variable, such that the sampling efforts necessary to estimate true values within 10% with 95% confidence were > 130 km of transects for downed CWD and > 550 ha area for standing CWD. The vast majority of studies involve much lower sampling efforts, suggesting that considerably more data are required to precisely quantify tropical forest WD pools and fluxes. The demonstrated importance of elevated WD in our study indicates a need to understand how elevation above the ground alters decomposition rates and incorporate this understanding into models of forest carbon cycling.
机译：木质碎片（WD）股票和助体是森林碳预算的重要组成部分，但仍然被解读，特别是在热带森林中。在这里，我们展示了在热带森林中进行的WD股票和助势的最全面评估，包括暂停WD的第一个热带估计之一。我们依赖于巴拿马旧成长潮湿的热带森林中收集的数据，以量化时空变异性，并为不同部件估计最小样本尺寸。 Downed WD构成了总WD质量的大多数（78％），常设WD贡献了大量少数群体（21％），暂停的WD是最小的组成部分（1％）。然而，考虑到在土壤高于土壤上升的次数的部分时，大多数WD投入和大约50％的WD股票与森林地板断开了连接。分享和莲花木材分别占17岁至2％的WD。驻扎CWD的停留时间平均为1.9岁（CWD; 20厘米直径）和3.6岁。 WD股票和投入高度空间可变，使得在10％的尺寸范围内估计真正值为的抽样努力，距离CWD的下调和> 550公顷区域的横断面有130公里。绝大多数研究涉及更低的采样努力，表明需要更多的数据来精确地量化热带森林WD池和助熔剂。我们研究中升高的WD的重要性表明，需要了解地面上方的仰角改变分解率，并将这种理解纳入森林碳循环模型。

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