Effects of clearcutting and girdling on soil respiration and fluxes of dissolved organic carbon and nitrogen in a Japanese cedar plantation
Effects of clearcutting and girdling on soil respiration and fluxes of dissolved organic carbon and nitrogen in a Japanese cedar plantation
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DOI：
10.1016/j.foreco.2021.119520
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发表时间：
2021-10
影响因子：
3.7
通讯作者：
K. Fujii;Shinya Funakawa;Chie Hayakawa;T. Kosaki
中科院分区：
文献类型：
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作者：
K. Fujii;Shinya Funakawa;Chie Hayakawa;T. Kosaki
由于地下生物地球化学过程之间复杂的相互作用，森林管理实践对土壤碳（C）和氮（N）动态的影响仍然存在争议。为了优化最大限度减少土壤碳和氮损失的实践，我们通过比较日本雪松种植园的皆伐、茎环剥（去除树皮和韧皮部组织）和对照处理，研究了管理实践对土壤碳和氮通量的影响，包括溶解有机碳（DOC）和氮的浸出。据推测，与环割相比，皆伐开放的树冠对土壤碳流失和硝酸盐氮淋溶有更大的影响。结果表明，皆伐增加了土壤异养呼吸（有机物分解）并导致土壤有机碳（2.9–3.7 Mg C ha−1yr−1）损失。环带树木枯死带来的较高凋落物输入导致有机层的 DOC 通量增加，而砍伐后新鲜凋落物输入的损失则减少了有机层的 DOC 通量。由于植物氮吸收的损失和土壤有机质矿化的增加，皆伐使硝酸盐氮淋溶增加了 3.3–4.8 kg N ha−1yr−1，但环抱处理中溶解性有机质的高碳氮比限制了硝酸盐淋溶。森林管理措施对土壤碳流失和硝酸盐淋失损失的影响可能各不相同，但皆伐中的砍伐和茎环带缓慢枯死可以减轻土壤碳流失和硝酸盐淋失损失。
Impacts of forest management practices on soil carbon (C) and nitrogen (N) dynamics remain under debate due to complex interactions between belowground biogeochemical processes. To optimize practices that minimize soil C and N losses, we investigated the effects of management practices on soil C and N fluxes, including the leaching of dissolved organic C (DOC) and N, by comparing clearcutting, stem girdling (removal of the bark and phloem tissue), and control treatments in a Japanese cedar plantation. Canopy opening by clearcutting is hypothesized to have a greater effect on soil C loss and the leaching of nitrate-N relative to girdling. Results showed that clearcutting increased soil heterotrophic respiration (organic matter decomposition) and lead to a loss of soil organic C (2.9–3.7 Mg C ha−1yr−1). Higher litter inputs from girdled tree dieback caused an increase in DOC fluxes from the organic horizon, whereas the loss of fresh litter inputs decreased DOC fluxes from the organic horizon following clearcutting. Clearcutting increased nitrate-N leaching by 3.3–4.8 kg N ha−1yr−1due to the loss of plant N uptake and the increased mineralization of soil organic matter, but high C/N ratios in dissolved organic matter limited nitrate leaching in the girdled treatment. Effects of forest management practices on soil C loss and nitrate leaching loss could be variable, but the slash application in clearcutting and the slow dieback in stem girdling could mitigate soil C loss and nitrate leaching loss.