不同疏伐方法下短旋杂交杨树林的生态系统碳和养分平衡

IF 3.1 3区 工程技术 Q3 ENERGY & FUELS BioEnergy Research Pub Date : 2024-06-29 DOI:10.1007/s12155-024-10780-1
Reimo Lutter, Heiki Hepner, Arvo Tullus, Hyungwoo Lim, Tea Tullus, Eele Õunapuu-Pikas, Reeno Sopp, Marju Kaivapalu, Kristjan Täll, Katri Ots, Hardi Tullus
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引用次数: 0

摘要

矮林种植在短轮作周期内生产生物燃料和碳吸收方面获得了高度关注。人们对这种密集型灌木林管理如何影响土壤肥力和养分供应以保持碳汇的了解十分有限。我们研究了爱沙尼亚半干旱地区不同疏伐方法下杂交杨树灌丛 5 年的生态系统碳和养分平衡与分配情况。变化的基准值是在以前种植的杂交杨树人工林被砍伐后出现灌木丛之前确定的。研究的系统疏伐处理如下:清除 67% 树木的走廊疏伐(CT)、清除 89% 树木的交叉走廊疏伐(CCT)和未疏伐(UT)的矮林。UT和CT处理在生态系统层面上实现了正的碳平衡。在所有处理中,0-20 厘米深层的土壤酸度、有机碳、全氮、全钾、全镁和全锰含量都有所下降,而土壤中的铜和硼含量则有所上升。UT处理的叶片N、P和K含量高于两种疏伐处理,这表明在疏伐2年后,杨树尚未完全从根芽比的变化中恢复过来,而中小型树木的叶片质量分数已经增加。在 5 年轮伐期中,从UT地点收获生物能源将导致生态系统总池中的氮磷钾减少 5-18%。总体而言,杂交杨树灌木林在第一个 5 年期后显示出积极的生态系统碳平衡;然而,由于我们发现土壤有机碳和养分浓度在短期内有所下降,因此需要进一步监测土壤特性。
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Ecosystem Carbon and Nutrient Balances in Short-Rotation Hybrid Aspen Coppice Under Different Thinning Methods

Coppice plantations have gained a high interest for biofuel production and carbon uptake in short rotation cycles. There is a limited knowledge how such intensive coppice management affects soil fertility and nutrients supply to maintain carbon sink. We studied ecosystem carbon and nutrients balance and allocation during a 5-year period in hybrid aspen coppice under different thinning methods in hemiboreal Estonia. The benchmark value for the changes was defined before the coppice emerged after the clear-cut of the previously planted hybrid aspen plantation. The studied systematical thinning treatments were as follows: corridor thinning with removal of 67% of the trees (CT), cross-corridor thinning with removal of 89% of the trees (CCT), and unthinned (UT) coppice. The UT and CT treatments resulted in a positive carbon balance at the ecosystem level. In all treatments, a decrease of soil acidity, organic C, total N, K, Mg and Mn contents, and an increase of soil Cu and B contents were observed in the 0–20-cm deep layer. The concentrations of leaf N, P, and K were higher in UT than in the two thinning treatments, indicating that the aspens had not entirely recovered from the changed root to shoot ratio 2 years after thinning, whereas the leaf mass fraction of medium- and small-sized trees had already increased. Bioenergy harvest from the UT site in a 5-year rotation would cause 5–18% removal of NPK from the total ecosystem pool. Overall, hybrid aspen coppice showed positive ecosystem carbon balance after the first 5-year period; however, further monitoring of soil properties is needed as we found decrease of soil organic C and nutrients concentrations in short term.

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来源期刊
BioEnergy Research
BioEnergy Research ENERGY & FUELS-ENVIRONMENTAL SCIENCES
CiteScore
6.70
自引率
8.30%
发文量
174
审稿时长
3 months
期刊介绍: BioEnergy Research fills a void in the rapidly growing area of feedstock biology research related to biomass, biofuels, and bioenergy. The journal publishes a wide range of articles, including peer-reviewed scientific research, reviews, perspectives and commentary, industry news, and government policy updates. Its coverage brings together a uniquely broad combination of disciplines with a common focus on feedstock biology and science, related to biomass, biofeedstock, and bioenergy production.
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