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首页> 外文期刊>Ecological research >Fine-root production and litterfall: main contributions to net primary production in an old-growth evergreen broad-leaved forest in southwestern Japan
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Fine-root production and litterfall: main contributions to net primary production in an old-growth evergreen broad-leaved forest in southwestern Japan

机译：细根生产和凋落物：日本西南部一种常绿常绿阔叶林对净初级生产的主要贡献

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摘要

Net primary production (NPP) is an important index for evaluating the patterns, processes, and dynamics of carbon cycling in forest ecosystems. In this study, we estimated the NPP in a warm-temperate old-growth evergreen broad-leaved forest in southwestern Japan. The estimation was based on four compartments: aboveground stand increment (Delta M), aboveground litterfall (Lf), fine-root production (Fr), and coarse root increment (Delta Cr). The data for Delta M and Delta Cr were collected from a permanent 200 x 200 m(2) plot over a 4-year interval, while Lf and Fr were collected over a 1-year interval. The NPP was 4.65 g m(-2) day(-1), of which Delta M accounted for 25.2 %, Lf accounted for 38.7 %, Fr accounted for 33.4 %, and the remaining 2.7 % was attributed to Delta Cr. There was a significant regression between aboveground litterfall and fine-root production (R (2) = 0.65, P < 0.05). Fine-root decomposition (0.66 g m(-2) day(-1)) accounted for 14.2 % of the NPP, leading to a higher belowground NPP in the present study compared with that in other forests. We conclude that an estimation of the decomposition of dead fine-roots by the continuous inflow method must be included to improve the accuracy of NPP estimations for forest ecosystems.
机译：净初级生产（NPP）是评估森林生态系统中碳循环的模式，过程和动态的重要指标。在这项研究中，我们估算了日本西南部一个温带老龄常绿阔叶林中的NPP。估算基于四个部分：地上林分增量（Delta M），地上凋落物（Lf），细根产量（Fr）和粗根增量（Delta Cr）。 Delta M和Delta Cr的数据是在4年的时间间隔内从200 x 200 m（2）永久性地块中收集的，而Lf和Fr是在1年的时间间隔内收集的。 NPP为4.65 g m（-2）天（-1），其中Delta M占25.2％，Lf占38.7％，Fr占33.4％，剩余的2.7％归因于Delta Cr。地上凋落物与细根产量之间存在显着的回归关系（R（2）= 0.65，P <0.05）。细根分解（0.66 g m（-2）天（-1））占NPP的14.2％，与其他森林相比，本研究导致地下NPP更高。我们得出结论，必须包括通过连续流入法对死细根分解的估计，以提高森林生态系统NPP估计的准确性。

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