长期疏伐会降低亚高山植被中异养呼吸对土壤呼吸的贡献率

IF 3.4 2区 农林科学 Q1 FORESTRY
Longfei Chen, Zhibin He, Wenzhi Zhao, Xi Zhu, Qin Shen, Mingdan Song, Zhengpeng Li, Junqia Kong, Shuping Yang, Yuan Gao
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引用次数: 0

摘要

由于亚高山森林生态系统的土壤碳密度高且对环境变化具有潜在的敏感性,人们对其土壤呼吸(Rs)动态的兴趣与日俱增。然而,作为一种主要的造林方法,人们对疏伐对亚高山人工林土壤呼吸作用及其异养呼吸和自养呼吸成分(分别为 Rh 和 Ra)的长期影响知之甚少,尤其是在冬季。本研究对中国西北地区中龄亚高山云杉人工林进行了为期 3 年的实地观测,并考虑了冬季二氧化碳的流出量。采用开沟法探讨了疏伐对Rs、Rh和Ra的长期影响。疏伐17年后,年平均Rs、Rh和Ra均有所增加,而Rh对Rs的贡献随疏伐强度的增加而减少。由于 Rh 的减少,疏伐明显降低了冬季 Rs,但对 Ra 没有明显影响。Rh 和 Ra 的温度敏感性(Q10)也随着疏伐强度的增加而增加,Rh 的 Q10 值(2.1-2.6)低于 Ra 的 Q10 值(2.4-2.8)。研究结果揭示了与 Rh 和 Ra 动态相关的解释变量和路径。疏伐增加了土壤水分和硝态氮(\({text{NO}}_{3}^{ - }/)-N),氮和水供应的增加通过提高细根生物量和微生物活性促进了 Rh 和 Ra 的生长。我们的研究结果突出表明,在长期疏伐后,({text{NO}}_{3}^{ - }\)-N 对刺激 Rs 成分具有积极作用。因此,从减少土壤二氧化碳排放的角度来看,不建议在疏伐亚高山云杉时施用氮肥。Rs 成分的 Q10 值增加表明,由于高寒地区气候变暖更加明显,预计疏伐后土壤二氧化碳排放量将大幅增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Long-term thinning decreases the contribution of heterotrophic respiration to soil respiration in subalpine plantations

Long-term thinning decreases the contribution of heterotrophic respiration to soil respiration in subalpine plantations

Interest in the dynamics of soil respiration (Rs) in subalpine forest ecosystems is increasing due to their high soil carbon density and potential sensitivity to environmental changes. However, as a principal silvicultural practice, the long-term impacts of thinning on Rs and its heterotrophic and autotrophic respiration components (Rh and Ra, respectively) in subalpine plantations are poorly understood, especially in winter. A 3-year field observation was carried out with consideration of winter CO2 efflux in middle-aged subalpine spruce plantations in northwestern China. A trenching method was used to explore the long-term impacts of thinning on Rs, Rh and Ra. Seventeen years after thinning, mean annual Rs, Rh and Ra increased, while the contribution of Rh to Rs decreased with thinning intensity. Thinning significantly decreased winter Rs because of the reduction in Rh but had no significant effect on Ra. The temperature sensitivity (Q10) of Rh and Ra also increased with thinning intensity, with lower Q10 values for Rh (2.1–2.6) than for Ra (2.4–2.8). The results revealed the explanatory variables and pathways related to Rh and Ra dynamics. Thinning increased soil moisture and nitrate nitrogen (\({\text{NO}}_{3}^{ - }\)-N), and the enhanced nitrogen and water availability promoted Rh and Ra by improving fine root biomass and microbial activity. Our results highlight the positive roles of \({\text{NO}}_{3}^{ - }\)-N in stimulating Rs components following long-term thinning. Therefore, applications of nitrogen fertilizer are not recommended while thinning subalpine spruce plantations from the perspective of reducing soil CO2 emissions. The increased Q10 values of Rs components indicate that a large increase in soil CO2 emissions would be expected following thinning because of more pronounced climate warming in alpine regions.

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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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