关键词: 杉木人工林, 生态系统, 净化大气环境, 评价

Abstract:

Based on located observations from a national key field scientific experimental station in Huitong, Hunan Province, the loss of the function and economic benefit of ecosystem's atmosphere purification due to Chinese fir plantation being clear-cut was analysed. After being clear-cut, owing to the end to photosynthesis of tree layer the ecosystem decreased the fixation of CO₂ by 17.24 t·hm^-2a^-1　and the emission of O₂ by 14.73 t·hm^-2a^-1,and the release of CO₂ was decreased by 16.64 t·hm^-2a^-1, and 9.775 t·hm^-2a^-1 was lost in the purification function of gaseous organism. By the economic means such as imitating market value method, the loss were estimated: 2 862 yuan·hm^-2a^-1 and 8 838 yuan·hm^-2a^-1 respectively due to the decrease of fixed CO₂ and emitted O₂, 2 762 yuan·hm^-2a^-1 due to the more release of CO₂, and 5 865 yuan·hm^-2a^-1 due to the less purification of gaseous organic pollutants. The total loss of ecosystem's purification benefit of atmospheric environment was amounted to 20 327 yuan·hm^-2a^-1.

Key words: Chinese fir, Ecosystem, Purification of atmospheric environment, Benefit loss, Appraisal