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Citation:

Change of Soil CH4 Fluxes of Robinia pseudoacacia Stand During Non-growing Season and the Impact Factors

  • Received Date: 2015-09-08
  • [Objective]To investigate the diurnal and seasonal variation of CH4 fluxes in different weather conditions, and explore the effects of soil and meteorological factor on CH4 fluxes in black locust forest soil. [Method]The automatic observation system with the near infrared laser and infrared laser analysis composite technology was used to measure the CH4 fluxes of soil in Robinia pseudoacacia L. plantation in low hilly land of north China from October 2014 to April 2015. Meanwhile, the atmospheric temperature and relative humidity, soil temperature and soil water content (5 cm), global radiation and precipitation were concurrently measured. The principal component analysis and stepwise regression analysis were used to analyze the relationship among the factors and determine the main factor of soil CH4 flux. [Result](1) The soil of R. pseudoacacia plantation was the important atmospheric CH4 sink during the non-growing season with the range from-0.15 to-2.34 nmol·m-2·s-1. The diurnal variation of CH4 fluxes showed diurnal characteristics of "V-shape",and had higher absorption capacity in a clear day (-0.78 nmol·m-2·s-1) but lower in cloudy (-0.61 nmol·m-2·s-1), rainy or snowy day (-0.58 nmol·m-2·s-1). From November 2014 to January 2015, a gradual decline in the absorption capacity of soil was found. The remained fairly low until the spring when the soil started thawing. The soil CH4 absorption capacity reached the maximum (-2.34 nmol·m-2·s-1) in March 2015. (2) There was a significant negative correlation relationship between soil CH4 fluxes and atmospheric temperature, soil temperature.The soil CH4 fluxes was positively correlated with atmospheric relative humidity. In March and April 2015, the most significant positively correlation was observed between CH4 fluxes and global radiation. (3) The factors of atmospheric temperature and relative humidity became the leading elements in terminal growth and winter while the atmospheric temperature and soil temperature (5 cm in depth) were the primary factors of soil CH4 fluxes in early growing season. [Conclusion]The R. pseudoacacia forest soil was the sinks of atmospheric CH4 during non-growing season. The absorption capacity of CH4 was the weakest in early non-growing season, while the absorption capacity of the soil gradually increased at the end of non-growing season. In the early period, the soil CH4 fluxes were mainly affected by atmospheric temperature and relative humidity. In the latter period, the soil CH4 fluxes were influenced by air temperature and soil temperature.
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Change of Soil CH4 Fluxes of Robinia pseudoacacia Stand During Non-growing Season and the Impact Factors

  • 1. Research Institute of Forestry, Chinese Academy of Forestry
  • 2.  Key Laboratory of Tree Breeding and Cultivation of the State Forestry Administration, Beijing 100091, China
  • 3. Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China

Abstract: [Objective]To investigate the diurnal and seasonal variation of CH4 fluxes in different weather conditions, and explore the effects of soil and meteorological factor on CH4 fluxes in black locust forest soil. [Method]The automatic observation system with the near infrared laser and infrared laser analysis composite technology was used to measure the CH4 fluxes of soil in Robinia pseudoacacia L. plantation in low hilly land of north China from October 2014 to April 2015. Meanwhile, the atmospheric temperature and relative humidity, soil temperature and soil water content (5 cm), global radiation and precipitation were concurrently measured. The principal component analysis and stepwise regression analysis were used to analyze the relationship among the factors and determine the main factor of soil CH4 flux. [Result](1) The soil of R. pseudoacacia plantation was the important atmospheric CH4 sink during the non-growing season with the range from-0.15 to-2.34 nmol·m-2·s-1. The diurnal variation of CH4 fluxes showed diurnal characteristics of "V-shape",and had higher absorption capacity in a clear day (-0.78 nmol·m-2·s-1) but lower in cloudy (-0.61 nmol·m-2·s-1), rainy or snowy day (-0.58 nmol·m-2·s-1). From November 2014 to January 2015, a gradual decline in the absorption capacity of soil was found. The remained fairly low until the spring when the soil started thawing. The soil CH4 absorption capacity reached the maximum (-2.34 nmol·m-2·s-1) in March 2015. (2) There was a significant negative correlation relationship between soil CH4 fluxes and atmospheric temperature, soil temperature.The soil CH4 fluxes was positively correlated with atmospheric relative humidity. In March and April 2015, the most significant positively correlation was observed between CH4 fluxes and global radiation. (3) The factors of atmospheric temperature and relative humidity became the leading elements in terminal growth and winter while the atmospheric temperature and soil temperature (5 cm in depth) were the primary factors of soil CH4 fluxes in early growing season. [Conclusion]The R. pseudoacacia forest soil was the sinks of atmospheric CH4 during non-growing season. The absorption capacity of CH4 was the weakest in early non-growing season, while the absorption capacity of the soil gradually increased at the end of non-growing season. In the early period, the soil CH4 fluxes were mainly affected by atmospheric temperature and relative humidity. In the latter period, the soil CH4 fluxes were influenced by air temperature and soil temperature.

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