受森林砍伐影响的北方森林沟渠中,代谢过程控制着二氧化碳动态

IF 2.6 Q2 WATER RESOURCES
Alberto Zannella, Karin Eklöf, Emma Lannergård, Hjalmar Laudon, Eliza Maher Hasselquist, Marcus B. Wallin
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引用次数: 0

摘要

北方水道向大气排放大量二氧化碳(CO 2)。在北欧和波罗的海国家的林业密集地区,这些水道中有很大一部分是人为的沟渠,目的是改善排水和提高森林生产力。以前的研究表明,陆地来源维持了这些沟渠中的二氧化碳,水文变化是主要的时间控制因素。然而,很少有研究探讨了受到森林采伐影响的集水区的沟渠二氧化碳动态及其相关控制。改变的水文、增加的养分输出和森林采伐后的光照供应都是可能改变沟渠二氧化碳水平、动态和来源控制的因素。在瑞典北部的Trollberget实验区,研究了高频(30分钟)co2浓度动态以及其他水化学变量,这些变化发生在排水完全收获的集水区的森林沟渠中。我们在5月至10月的无雪季节收集数据。沟渠co2浓度表现出明显的季节特征,夏季co2浓度高于春季和秋季。浓度范围为1.8 ~ 3.5 mg C L−1(中位数:2.4 mg C L−1,IQR = 0.5 mg C L−1)。在初夏,CO 2的强烈日循环发展,CO 2的日振幅达到1.1 mg C L−1。这些显著的CO 2日循环与短波辐射日和水温密切相关。水文变化对co2动态的影响一般较低,但在季节和个别水文事件之间确实存在差异。研究表明,受采伐影响的林沟生长季co2浓度变化较大,主要受光和温度诱导代谢的控制。在受集约化林业影响的北方地区扩大沟渠二氧化碳排放时,需要考虑这些高动态和相关的控制措施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metabolic processes control carbon dioxide dynamics in a boreal forest ditch affected by clear-cut forestry
Boreal watercourses are large emitters of carbon dioxide (CO 2 ) to the atmosphere. For forestry intensive areas of the Nordic and Baltic countries, a high share of these watercourses are man-made ditches, created to improve drainage and increase forest productivity. Previous studies have suggested that terrestrial sources sustain the CO 2 in these ditches and variability in hydrology is the main temporal control. However, few studies have explored ditch CO 2 dynamics and its associated controls in catchments being exposed to forest harvest. An altered hydrology, increased nutrient export and light availability following forest harvest are all factors that potentially can change both levels, dynamics, and source controls of ditch CO 2 . Here, high-frequency (30 min) CO 2 concentration dynamics together with other hydrochemical variables were studied in a forest ditch draining a fully harvested catchment in the Trollberget Experimental Area, northern Sweden. We collected data during the snow-free season from May to October. Ditch CO 2 concentrations displayed a clear seasonal pattern with higher CO 2 concentrations during summer than in spring and autumn. Concentrations ranged from 1.8 to 3.5 mg C L −1 (median: 2.4 mg C L −1 , IQR = 0.5 mg C L −1 ). Strong diel cycles in CO 2 developed during early summer, with daily amplitudes in CO 2 reaching up to 1.1 mg C L −1 . These pronounced daily cycles in CO 2 were closely related to the daily sum of shortwave radiation and water temperature. Variations in hydrology had generally a low impact on the CO 2 dynamics but did vary among seasons and between individual hydrological events. It was evident from our study that growing season CO 2 concentrations in a forest ditch affected by clear-cut harvest were highly variable and mainly controlled by light and temperature induced metabolism. These high dynamics and the associated controls need to be considered when scaling up ditch CO 2 emissions across boreal landscapes affected by intensive forestry.
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来源期刊
Frontiers in Water
Frontiers in Water WATER RESOURCES-
CiteScore
4.00
自引率
6.90%
发文量
224
审稿时长
13 weeks
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