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生态学杂志 ›› 2022, Vol. 41 ›› Issue (6): 1056-1065.doi: 10.13292/j.1000-4890.202205.002

• 研究报告 • 上一篇    下一篇

间伐和施肥对杉木人工林土壤温室气体排放的影响

丁驰1,雷梅1,甘子莹1,王浩1,严强2,丘清燕1*,胡亚林1   

  1. （1福建农林大学林学院， 森林生态稳定同位素研究中心， 福州 350002；2福建农林大学西芹教学林场， 福建南平 353000）
  • 出版日期:2022-06-10 发布日期:2022-06-07

Effects of thinning and fertilization on GHGs emissions in Chinese fir plantation soil.

DING Chi1, LEI Mei1, GAN Zi-ying1, WANG Hao1, YAN Qiang2, QIU Qing-yan1*, HU Ya-lin1   

  1. (1College of Forestry, Fujian Agriculture and Forestry University, Forest Ecology and Stable Isotope Research Center, Fuzhou 350002, China; 2West Celery Teaching Forest Farm of Fujian Agriculture and Forestry University, Nanping 353000, Fujian, China).
  • Online:2022-06-10 Published:2022-06-07

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摘要： 明确间伐强度和施肥对人工林土壤温室气体排放的影响，是准确评估人工林土壤温室气体排放能力的重要基础。以我国亚热带杉木（Cunninghamia lanceolata）人工林为对象，通过设置3种间伐强度（轻度、中度和重度）和2种施肥处理（不施肥和施肥）来研究间伐和施肥对杉木人工林土壤CO2、CH4和N2O排放通量以及全球增温潜势的影响，并结合土壤理化性质阐明影响温室气体排放的主要因素。结果表明：与中度间伐相比，轻度间伐显著促进了土壤CO2的排放和CH4的吸收，施肥显著提高了轻度间伐土壤的Q10值，施肥显著抑制了中度间伐土壤N2O的排放，施肥与重度间伐共同处理显著促进了土壤CO2与N2O的排放以及CH4的吸收；从全球增温潜势来看，重度间伐与施肥共同处理下的全球增温潜势最大，其次为轻度间伐处理，中度间伐处理最低。从整个观测期来看，杉木人工林土壤是大气CO2和N2O的源，是CH4的汇；土壤湿度是影响CO2排放和CH4吸收的主导因素，其次为土壤N素有效性，而土壤N2O的排放主要受土壤温度的调控；不同间伐强度和施肥处理通过改变土壤水热条件和N素有效性对杉木人工林土壤温室气体排放产生显著影响，中度间伐土壤具有良好的减排限排能力。

关键词: 间伐强度, 施肥, 杉木人工林, 温室气体排放, 全球增温潜势

Abstract: Understanding the effects of thinning intensity and fertilizer application on soil greenhouse gas emissions of forest plantations is important to accurate assessment of the capacity of greenhouse gas emissions from plantation soils. In this study, three levels of thinning intensity (mild, moderate, and severe) and two levels of fertilizer application (no fertilization and fertilization) were carried out in a subtropical Chinese fir (Cunninghamia lanceolata) plantation in China to investigate the effects of thinning intensity and fertilization  on soil CO2, CH4 and N2O emissions and global warming potentials (GWPs). Soil physicochemical properties were measured to clarify the main factors that regulating soil greenhouse gas emissions. The results showed that mild thinning intensity significantly increased soil CO2 emissions and CH4 absorption compared with moderate thinning intensity. Fertilization together with mild thinning intensity significantly increased soil temperature sensitivity (Q10). Fertilization combined with moderate thinning intensity significantly decreased soil N2O emission, while fertilization combined with severe thinning intensity significantly increased soil CO2 and N2O emissions and CH4 absorption. From the perspective of GWPs, the combined treatment of severe thinning intensity and fertilization had the largest GWPs, followed by mild and moderate thinning intensity. Throughout the observation period, Chinese fir plantation soil was CO2 and N2O source, but CH4 sink. Soil moisture was the dominant factor regulating soil CO2 emission and CH4 absorption, followed by soil available N. Soil N2O emissions were controlled by soil temperature. The results indicated that different thinning intensities and fertilization treatments had significant effects on soil greenhouse gas emissions and GWPs of Chinese fir plantations by changing soil moisture, temperature and N availability. Moderate thinning had better potential in reducing soil greenhouse gas emissions.

Key words: thinning intensity, fertilization, Chinese fir plantation, GHG-S emission, GWP-S.

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