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Effect of clear-cutting silviculture on soil respiration in a subtropical forest of China

机译:明确的造林对中国亚热带森林土壤呼吸的影响

摘要

Aims: Clear-cutting is a common forest management practice, especially in subtropical China. However, the potential ecological consequences of clear-cutting remain unclear. In particular, the effect of clear-cutting on soil processes, such as the carbon cycle, has not been quantified in subtropical forests. Here, we investigated the response of soil respiration (Rs) to clear-cutting during a 12-month period in a subtropical forest in eastern China.\udMethods: We randomly selected four clear-cut (CC) plots and four corresponding undisturbed forest (UF) plots. Measurements of Rs were made at monthly time points and were combined with continuous climatic measurements in both CC and UF. Daily Rs was estimated by interpolating data with an exponential model dependent on soil temperature. Daily Rs was cumulated to annual Rs estimates.\udImportant Findings: In the first year after clear-cutting, annual estimates of Rs in CC (508±23g C m−2 yr−1) showed no significant difference to UF plots (480±12g C m−2 yr−1). During the summer, soil temperatures were usually higher, whereas the soil volumetric water content was lower in CC than in UF plots. The long-term effects of clear-cutting on Rs are not significant, although there might be effects during the first several months after clear-cutting. Compared with previous work, this pattern was more pronounced in our subtropical forest than in the temperate and boreal forests that have been studied by others. With aboveground residuals off-site after clear-cutting, our results indicate that the stimulation of increasing root debris, as well as environmental changes, will not lead to a significant increase in Rs. In addition, long-term Rs will not show a significant decrease from the termination of root respiration, and this observation might be because of the influence of fast-growing vegetation after clear-cutting in situ.
机译:目的:砍伐森林是一种常见的森林经营方式,尤其是在亚热带地区。然而,明确的潜在生态后果仍然不清楚。特别是,在亚热带森林中,尚未明确砍伐对土壤过程(如碳循环)的影响。在这里,我们调查了中国东部亚热带森林在12个月内土壤呼吸(Rs)对未砍伐的响应。\ ud方法:我们随机选择了四个未砍伐(CC)地块和四个相应的未受干扰的森林( UF)情节。 Rs的测量是在每月的时间点进行的,并与CC和UF中的连续气候测量相结合。通过用取决于土壤温度的指数模型对数据进行插值来估算每日Rs。重要结果:在明确的第一年,CC中的Rs年度估计值(508±23g C m-2 yr-1)与超滤图没有显着差异(480± 12克C m-2 yr-1)。在夏季,土壤温度通常较高,而CC的土壤体积水含量低于UF地块。清除对Rs的长期影响并不显着,尽管清除后的最初几个月可能会产生影响。与以前的工作相比,这种模式在我们的亚热带森林中比在其他人研究过的温带和北方森林中更为明显。清除残渣后,地上残留物不在现场,我们的结果表明,不断增加的根部碎片以及环境变化的刺激不会导致Rs显着增加。此外,从根系呼吸作用终止后,长期Rs不会显示出明显的下降,这可能是由于原地砍伐后快速生长的植被的影响。

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